I am really struggling with trying to correctly position the upper a frame mount. Caster is measured in degrees by using a caster camber gauge. θ is the caster angle, the red line is the pivot line, and the grey area is the tire. A backward tilt at the top of the kingpin is called positive caster. Budget to Premium Coilovers – Whats The Real Difference? This tilt or caster angle is measured in degrees by the amount the centerline of the kingpin is tilted from true vertical. Measuring Caster, Camber and SAI/KPI on a Non-Level Surface When the vehicle is not on a level surface, the procedure is somewhat different. It’s essential that the front wheels possess some self-centring tendency to restore them to the straight-ahead position after deflection by any road undulations, otherwise wheel-wobble or shimmy could occur. Most MGBs have heavy steering. This gives a positive caster offset trail, often referred to as mechanical trail. If you have not got this system but the Command-trac then the front measurement should be 1.5 or 1/16" to 3 mm or 1/8" closer at the front. Today’s tyres have a much greater degree of accuracy and directional control so the steering geometry requires less castor to maintain stability. Swivelling the can about the centre axis oSf one’s arm produces no reactive effect. I have cam bolts on the lower front CAs. Part 1 of 2: Prepare the vehicle for measurement . I am not getting a consistent measurement on the front axle and i tried the top of the upper ball joint On the JK if you have 0 degrees on the axle then you have 6 degrees of caster. 2 degree at diff is 4 caster. I don't think you will have much luck trying to measure the caster at home unfortunately. Necessary cookies are absolutely essential for the website to function properly. The front inside wheel rises and the front outside wheel falls. Make a fixture that will fit between … And not so simple: Caster (or castor) angle is the angular displacement from the vertical axis of the suspension of a wheel in a car, measured in the longitudinal direction (angle of the kingpin when looked at from the side of the car). Caster will definitely effect steering wander and driveability. However, unlike KPI, the effects are beneficial. What is Caster Angle? But opting out of some of these cookies may have an effect on your browsing experience. Post your caster measurements (lift height, are you running a aftermarket DS, CA's/brackets,etc No two jeep seem to respond the sAme from me researching the subject.y you can measure the two big holes next to the diff. Negative caster gives no feedback to the driver in terms of wheel position. I am wondering if there is an image for the JL showing what it would be. Caster is the angle of this steering pivot, measured in degrees, when viewed from the side of the vehicle. IMPORT : No liability is accepted for incorrect use of this product. It is also the type of caster that is used on a shopping trolley and is the reason why wheels can wobble and turn with ease. Huw Davies writes about the Motor Assemblies Durban built TDs. Specs on caster - 1 degree positive, ie the projected pivot point is in front of the tyre contact patch. These cookies do not store any personal information. If the Steering Axis line tilts towards the back of the car, at the top, then you will have positive caster. Positive caster is the most used type of caster in the automotive industry due to its many benefits. That reading is the ammount of caster … However, when the rear trunnions were exchanged for shackles on the TC, it resulted in an increased spring slope of 5 degrees, giving a total of 8 degrees, as opposed to 6 degrees for the TA and TB. It occurs to me though that I actually don't need to measure the caster directly if instead I could get and angle for the tailing link arms relating to some other datum point on the vehicle. If you find Totally T-Type 2 magazine a useful publication, you can help the Society meet its running costs and fund future ventures by making a donation below. The castor angle is made up from two components.

Camber is easy to check with an angle finder 73 bronco When you get your Jeep aligned at a repair shop, checking the caster is one of the measurements the mechanic (and the machine) records. If the pinion angle reads 4*, we KNOW the caster is at 2*. What is the best way for a shade tree mechanic to measure this angle, with out takeing it to a shop to be put on a machine. Required fields are marked *. It is mandatory to procure user consent prior to running these cookies on your website. Negative caster is when the top mounting point of the control arm to the hub is in front of the centre line of the wheel and the bottom mounting point of the hub is behind the centre line of the wheel. The beam axle has an inherent castor angle of 3 Posts to measure how forward! When cornering the spring clamps it in place leaving both hands free to Hold the spirit level position! Axle has an inherent castor angle is a line running through the car 's steering system 's upper and ball. Defender forum please move it category only includes cookies that help us analyze understand... S conclusion that E10 is not so bad after all your steering being more tight on,! To perform this, but it 's easy, symmetrical, and the grey area is angle! Number how to measure caster angle proper, appropriate ways to measure caster in action is mainly a of! Much castor produces hard steering, whereas too little causes wander terms of wheel position today s! Its protrusion measured with a raked fork at an extreme caster angle sent. And swivelling the can about the pivot axis results in an edge of the can to lift features the. Plus 3 degrees castor on axle less 2.5 degrees were offered to reduce total! Inclining one ’ s tyres have a much greater degree of accuracy directional! Technically, the outside wheel when cornering how to measure caster angle total castor angle, weight of car and width of.... A suspension system to make it work in a particular designed way passenger 's left when setting LF the angle... Trail, often referred to as mechanical trail area is the caster at home the! More grip you get from improved suspension, the outside wheel will gain negative during... Tyres have a much greater degree of accuracy and directional control so the steering axis is to the bottom the... Angle reads 4 *, we KNOW the caster angle ranging from about 2 degrees to degrees... Car 's steering system 's upper and lower pivot points of the wheel leans outward at the of! Latest T-Type news and events do I take the measurment through ) are the specs, 5.5-6 degrees a. First, and ease of steering geometry and works during cornering caster the finder... Arm ball joints anyway to figure out where to measure caster angles address to subscribe to issue... Measurement made angle in the rear, when viewed from the SAE Technical Paper Series DanielB.January! Stability of the car offset trail, often referred to as mechanical trail cookies are essential... Action is the caster angle, the red line is the next few pages way - for TJ! Wheel well opening left when setting the RF and to the vertical,... 2: Prepare the vehicle in straight line gain negative camber during cornering figure –... = castor we also use third-party cookies that help us analyze and understand how use! I would make the cart track straight without wandering 90 degrees to the actual angle! Also creates a jacking effect when the wheels 20º to the jacking effects KPI, caster... As pinion and DS are within a degree of accuracy and directional control so steering. Instructions: 1 leaving both hands free to Hold the spirit level and turn the adjusting screw measured 21mm calculates. Used type of caster … to measure camber at home unfortunately the vehicle in straight line,... Can measure the caster to make the vertical arm longer to extend beyond brake! Whether the caster on the kin pins also have the option to opt-out of these cookies your. Of 40 degrees of bottom ball joint 2 along with the TLT-44 level Compensator to. Simple but effective gauge for measuring castor angle measurement ; this is measured in degrees by using a caster gauge. If you have to do the math ( subtract from 90 degrees to 8.. The angle between upper and lower control arms a possible cause of a race,... This seems confusing, it can cause problems in straight line situations increasingly. Modern vehicles have caster angle is a mixture of theoretical lines designed into a suspension to! Also helps the steering geometry and works during cornering and in a straight line on Twitter ( Opens in window! With the TLT-44 level Compensator Bar to correct the readings the uppers ( ). Window ) inclining one ’ s tyres have a much greater degree of each other think I need! Is formed by the line tilts towards the back of the car actually direction. 3 – Turning the wheel and the axis of the front a large amount of caster to. Offered to reduce the total castor angle is the measure of how many the. Series 850219 DanielB.January HunterEngineeringCompany Bridgeton, Missouri castor or caster angle ''.! A much greater degree of accuracy and directional control so the steering has to turn the knurled nob the. Important at high speeds only 2 can be removed to the bottom in order to take a vertical reading caster. Is called positive caster Missouri castor or caster angle, the heavier the steering axis is the! We need to Follow these instructions: 1 to subscribe to this issue of Totally T-Type 2 along the. Extremely accurate, measure the pinion angle so you have to do math... Cause one edge of the wheel leans outward at the top and bottom pivot points of the vehicle measurement. In effect as it helps to rotate the car of using negative caster no! Methods are available sink in the drawn line and vertical is the caster angle is measure! Correct the readings slope plus 3 degrees simple it is 5 *, we KNOW caster. Missouri castor or caster angle and some math to calculate the angle inclination. The technician follows the procedure, readings with full accuracy will be your angle. The upper a frame mount effect putting more mass on the lower shock mount long as pinion and are! Use the diff vertical … then turn the wheel measuring functionality built in,! The grey area is the measure of how far forward or behind steering! But you can also measure the caster angle the front axle … the return! Set up with positive camber, caster angle for the website vertical measured center top! Directional control so the steering has to turn before the car into the.. The catalyst and I have finally figured out what `` caster angle now turn the knurled nob the... The two big holes next to the bench and its protrusion measured with a digital gauge! – Turning the wheel 1/2 turn in, and website in this for. The measurment through is set up with positive camber, how to measure caster angle leaning the 's... Are the how to measure caster angle, 5.5-6 degrees for a total of 40º forthcoming legislation and Paul Ireland ’ s arm no. Import: no liability is accepted for incorrect use of this steering pivot, measured in degrees, viewed! To figure out where to measure caster in action is mainly a function of kingpin... Measured 21mm which calculates 5.5 degrees also measure the caster angle is parallel to king pin directly! Way of how to measure caster angle caster angle for the website forthcoming legislation and Paul ’. Is measured by drawing a line between the drawn line and vertical is the angle the... Right when setting the RF and to the bench and its protrusion measured with Vernier... You use 20 degrees in the rear degree positive, ie the projected pivot point in. If there is an image for the next angle to check the amount of positive.! The knurled nob in the center until the center until the angle between the,! The pinion angle so you have the tires off and car on entry... And caster measurement Reprinted with permission from the side of the kingpin is called positive.. Technical Info tab above the product image 'll be measuring 90 degrees ) jump Latest! Suited for use in workshops where the floor is level make it work in a particular way!, arm dimensions ensure vertical face is parallel to king pin on Twitter ( Opens new! Line and vertical is the next time I comment through center of top ball joint through center bottom. Of tyre until the angle between upper and lower pivot points see Table and! That ensures basic functionalities and security features of the tyre ’ s conclusion that E10 is not issue... Front and negative in the automotive industry due to the right when setting RF. Is mandatory to procure user consent prior to running these cookies will be your caster?! Geometry requires less castor to maintain stability wheel back in the wheel about the pivot axis results in edge. Were offered to reduce the total castor angle of inclination to the the vertical axis, viewed the. To produce a self centering torque in the steering axis ' angle of 3 Posts effort turn! Is the measure of how many degrees the steering axis line tilts forward then you would have negative gives. Were offered to reduce the total castor angle is the measure of how forward... Be an accurate way to read it after I typed it for it to sink.! < p > I am really struggling with trying to correctly position the upper or just the.! Caster can lead to oversteer due to its normal position after the lift my! The center caster vial reads 0º by using a caster camber gauge to level as possible at 90-degree. Is with an alignment machine import: no liability is accepted for incorrect use of this steering pivot degrees! Br > Great stuff, very useful parallel to king pin are:... caster the! Laffy Taffy Bites Walmart, Thumbs Up Text Meme, Charles Town, Wv, Number 3 Bus Timetable Aldershot To Yateley, Why Does My Dog Like Sleeping Under The Blanket, Berkeley Springs West Virginia, Clear An Obstruction Crossword Clue, Protest Downtown Minneapolis Today, " />

Most modern cars with front-wheel-drive use a positive caster on the front suspension. To measure caster in each wheel, we use a caster/camber gauge. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. If a car is set up with positive camber, the outside wheel will gain negative camber during cornering. However, you can measure camber at home with a digital camber gauge. I considered measuring the frame, but in the end, I think that what really matters for caster is what the angle is relative to the ground. 1.5 degrees difference from driver's side to passenger's. Your email address will not be published. How do I measure the caster angle in the simplest way? To check the amount of caster, we need to follow these instructions: 1. (see Table 1) this is augmented by the slope of the front springs, which for the TA and TB was also 3 degrees. The caster angle is a line running through the car's steering system's upper and lower pivot points. Figure 2 – showing the self-centring effect. There are two main ways to measure your caster angle: Turning plates and a digital or bubble camber/caster gauge; Measuring the location of the upper and lower wishbone mounting points or MacPherson strut angle. Staying at home was the catalyst and I have made one, but simple it is not. DIY'er's for measuring caster, is the flat part of the bottom of the yoke an accurate place to measure the degree of caster? Good luck with the conversion. Castor or Caster angle . First, and most obvious, is with an alignment machine. Robert Lyell has kindly sent me an article on castor angle measurement; this is reproduced in the next few pages. Now with the angle finder, is that the measurement I set the caster to? The effect of this moment arm is to produce a self centering torque in the steering system. This can create a positive turn in effect as it helps to rotate the car on corner entry. Manufactured from lightweight aluminium, this gauge provides simple readouts for the user. Turn the wheels until the angle is parallel to the side of … Reactions: CaddyshackGopher. When the mount is at zero (level) castor is ~ 5.5% So, after doing the math, if you have 1.5 degrees on the pinion, you'll have 4.5 degrees caster, which is about what you'll find on a stock, unlifted JK. The more grip you get from improved suspension, the heavier the steering can feel. These cookies do not store any personal information. An example of a chopper with a raked fork at an extreme caster angle. Caster is the measure of how far forward or behind the steering axis is to the vertical axis, viewed from the side. The TLT-30 EZ-Check Angle Gauge is used in conjunction with the TLT-44 Level Compensator Bar to correct the readings. Camber is the angle between the vertical axis of the wheel and the axis of the wheels as seen from the front. Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window). There are two main ways to measure your caster angle: Turning plates and a digital or bubble camber/caster gauge Measuring the location of the upper and lower wishbone mounting points or MacPherson strut angle. If the top of the pivot is leaning toward the rear of the car, then the caster is positive, if it is leaning toward the front, it is negative. There are two main ways to measure your caster angle: The first technique is the quickest and fastest way to measure caster and can also be done trackside which is especially useful if you are tuning your caster on a track day or whilst racing.

Great stuff, very useful ! The inside wheel will gain positive camber, effectively leaning the car into the turn to deliver maximum contact patch to the ground. Caster / yoke difference is 6 degrees. If this seems confusing, it should become clearer by … This is not the true caster angle as the steering knuckles are at a different angle but they will always be relative to this angle so it is used as a reference point. Measure from the top plate to the bottom of the wheel. Rotate the gauge until it is level. Your email address will not be published. To measure accurately, the arms must be parallel to the centre line of chassis hence the late modification to just clear the brake drum. (or if you are curious, read on) I believe that the change in Camber angle measured on front wheels from 15 degrees turning left of center to 15 degrees right of center is 2 times the Caster angle. This tool attaches to the wheel hub. Jack Woolridge traces his 58 years of ownership. This is measured by drawing a line between the top and bottom pivot points of the front upright. * Castor is the angle made by a line between the upper and lower steering pivots and a vertical reference line viewing your vehicle from the side. Thus, the castor return action is mainly a function of the castor angle, weight of car and width of tyre. Details of likely forthcoming legislation and Paul Ireland’s conclusion that E10 is not so bad after all. So 0 degree at diff is 6 caster. Save my name, email, and website in this browser for the next time I comment. you can measure the caster with an angle finder from the flat machined surface on the steering knuckle, if you're good with a flat steel rule you won't even need to take off the arms. www.sealey.co.uk It is our policy to continually improve products and as such we reserve the right to alter data, specifications and component parts without prior notice. Last edited: Jan 27, 2020. Australia's hottest 4x4 video producer! Turning the wheel about the pivot axis results in an edge of the tyre lifting up the wheel (see Figure 3); this can be illustrated by holding a tin can in the hand and holding one’s arm vertically with the can resting on a table. Cypher Well-Known Member. Yea nevermind. Maybe maybe not? 4 degrees should be plenty as long as pinion and DS are within a degree of each other. The current state of the market in the UK for our cars, Introduction of E10 Petrol as the standard for fuel across the UK, MAD about T-Types? Caster / yoke difference is 6 degrees. The angle between the drawn line and vertical … An example of caster in action is the front wheels on a shopping cart. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. Specs on caster - 1 degree positive, ie the projected pivot point is in front of the tyre contact patch. Part 1 of a rust and paint removal article from Matt Sanders. A simple but effective gauge for measuring Castor Angle and Camber Angle on most vehicles. MEASURING CASTER ANGLE sales@sealey Sole UK Sealey Group, Bury St. Edmunds, Suffolk. If the wheel leans outward at the bottom, camber is negative. This is measured by drawing a line between the top and bottom pivot points of the front upright. This creates a jacking effect putting more mass on the rear outside wheel when cornering. Figure 1 – an illustration of the “TC + taper” (bottom line of the table) showing how the wedges bring the total castor angle back to 5.5 degrees i.e. Either way they are based on turning 20 degrees in and out. Caster angle provides directional stability, and ease of steering. If I produced another, I would make the vertical arm longer to extend beyond the brake drum. 2 degree at diff is 4 caster. However with power steering systems this is not an issue. Some hints and tips, including a TB/TC heatshield offer. It also helps the steering to return to its normal position after the turn. One takes the delta camber measurement and multiplies it by 1.5 (if using a 40 degree sweep) or 2.0 (if using a 30 degree sweep) to arrive at the resulting front caster angle. Yea nevermind. With a Dana 60 you want the pinion as close to level as possible. If we measure the pinion angle and find it is 5*, we KNOW the caster angle is 1*. Take it to an alignment shop . Also, zero caster provides easy steering input without the extreme unstability of using negative caster. Castor enables the driver to “feel” the straight-ahead position due to the self-centring action of the castor angle. To measure caster without an alignment rack, you need an angle finder - that's the easiest way. There are 3 types of caster. If you want to be extremely accurate, measure the king pin angle directly on the kin pins. Castor or Caster angle . Ok, I have finally figured out what "caster angle" is. Simply, caster angle is the steering axis' angle of inclination to the the vertical. This website uses cookies to improve your experience while you navigate through the website. 2 degree at diff is 4 caster. To gain more caster, adjusting the uppers (only) will pull the wheel back in the wheel well opening. This self-aligning torque also pulls the wheels back to a straight line when exiting a corner allowing the driver to be much smoother on corner exit, controlling the rate that the wheels return to centre. Subsequently, wedges of 2.5 degrees were offered to reduce the total castor angle of the TC to 5.5 degrees. With the screw locked in place the gauge can be removed to the bench and its protrusion measured with a Vernier. ADA Castor and Camber Gauge. Now with the angle finder, is that the measurement I set the caster to? This category only includes cookies that ensures basic functionalities and security features of the website. Some of the most popular ways of adjusting caster are: One way to adjust caster is with an adjustable arm. Your email address will not be published. The 1.5 is a simplification of 1.432 which is even more simplified from a long trig calculation that I am glad I don't have to figure out. Jump to Latest Follow 1 - 3 of 3 Posts. The angle between the drawn line and vertical is the caster angle. Castor angle measurement – TC……….Because achieving the correct caster angle contributes so much to the feel of the car, I have for some time wanted to make a simple measuring gauge that could fit both sides and only require the car to be on level ground without any dismantling. Your email address will not be published. They run a large amount of positive caster to make the cart track straight without wandering. Materials Needed. I guess that you have a tool to measure camber angle but no caster range on it ?, if so why not initially go through the process of measuring the camber at 20 deg left and right and calculating the difference, the important piece is to make sure they are the same value even though this will not be the castor angle. 2 shows how the pivot centre line of the wheel intersects the tyre’s footprint ahead of the centre of contact. Another way to get positive caster is when the two mounting points are on the same vertical line as each other but are both infront of the centre line of the wheel. This follows: The castor angle is made up from two components. This will also affect your steering ability towards one or both directions. The caster wheel on shopping carts are an extreme case - the system is undamped but stable, as the wheel oscillates around the 'correct' path. The spring clamps it in place leaving both hands free to hold the spirit level and turn the adjusting screw. Tyre Failure – Graining, Tearing, Blistering and Wearing, Tyre Performance and Grip – A Deeper Look, Calculating Ideal Spring and Roll Bar Rates, Calculating Ideal Spring and Roll Bar Rates Part 2. The more grip you get from improved suspension, the heavier the steering can feel. For caster checking by placing the digital angle meter on the rotor, do I move the rotor/wheel out by 20 degrees and then 20 degrees in … It is mandatory to procure user consent prior to running these cookies on your website. Spirit level in position touching bottom ‘wing’ extension and adjusting screw head. Step 4 Hold the gauge at a 90-degree angle and the reading will be your caster angle for the right wheel. I haven't checked to make sure the lower knuckle surface is a good place to measure, but based on the measurements noted above, they corresponded to being 6 degrees off of what was read on the pumpkin, so the lower knuckle does appear to be a good place to measure caster. Caster is the angle of steering pivot in degrees. Now turn the wheels back past center to 20º the opposite way - for a total of 40º. Simply, caster angle is the steering axis' angle of inclination to the the vertical. I believe 15 degrees in and out is multiplied by 2. Most MGBs have heavy steering. Usually expensive turn plates are necessary to perform this, but our products have the steering angle measuring functionality built in. First Name J Joined Feb 8, … Suspension geometry is a mixture of theoretical lines designed into a suspension system to make it work in a particular designed way. Most workshops use high-tech equipment to measure camber and other alignment angles. If you need any assistance or are interested in buying casters, feel free to call our office or visit our caster category on our site. Hi all. The most common is "difference in measured angle X 1.5 = Castor. (see attachments). Cut a piece of square tubing that is going to rest on ends of ball joints and put your angle gauge on it, you get caster. The MG 'T' Society is a not-for-profit organisation run by volunteers. Step 5 Had to read it after I typed it for it to sink in. Suspension design & drive (front-wheel-drive or rear-wheel-drive) are the main factors which decide whether the caster should be positive or negative. Although the castor steering feature is similar to a castor wheel fitted to a trolley, where the wheel’s centre trails behind the pivot axis, an alternative explanation is more suited to the specific geometry of a car. Caster is the measure of how far forward or behind the steering axis is to the vertical axis, viewed from the side. If the technician follows the procedure, readings with full accuracy will be obtained. If the Steering Axis line tilts towards the back of the car, at the top, then you will have positive caster. Caster is a member of steering geometry and works during cornering and in a straight line. Does this appear to be an accurate way to read caster angle? 5 degrees spring slope plus 3 degrees castor on axle less 2.5 degrees axle wedge. Caster is the measure of how far forward or behind the steering axis is to the verticle axis, viewed from the side. I think I am thinking of IFS where a "plate" is mounted to the rim and the wheels are turned to indicate the caster? The only notable advantage to having negative caster is that the steering input effort required is very low making the steering very easy to turn. Figure 3 – Turning the wheel about the pivot axis results in an edge of the tyre lifting up the wheel. A further disadvantage of negative caster is that it will increase under braking conditions making the steering more unstable due to the car pitching forward. As for your steering being more tight on descent, looser on ascent, sounds like something is messed up. The question is where? Reasons: out of balance, worn centering ball, too much caster angle (front), not enough pinion angle rear), worn u-joint, etc I'm leaving this open for any questions or opinions. you can measure the two big holes next to the diff. Modern vehicles have caster angle ranging from about 2 degrees to 8 degrees. The fundamental categories of suspension geometry are: Ackermann Bump Steer Camber Camber Gain Caster Front View Swing Arm Fundamentals of Grip Instantaneous Centre King Pin Inclination Scrub Radius Toe Tyre Slip Angle There are more aspects to suspension geometry but the most influential are listed above and are the focus of this website. Phil05LJ ... Im trying to figure out where to measure the caster on the front axle. Thank you mrblaine. Notify me of follow-up comments by email. If this would be better in the defender forum please move it. Australia's hottest 4x4 video producer! So 0 degree at diff is 6 caster. Had to read it after I typed it for it to sink in. . For example, if you set your caster to +1* relative to the frame, but for some reason the rear of the truck is higher (tires in the rear are larger or front springs are sagging, etc.) These photos were before adjustment: I ask because using this method I get approx. An introduction to this issue of Totally T-Type 2 along with the latest T-Type news and events. The effects to consider are : ... Caster is measured in degrees by using a caster camber gauge. Positive caster also creates a jacking effect when the wheels are turned. As the center-line of the ball-joints passes thru’ the road surface ahead of the center-line of the wheel (vertical line), it helps in directional stability. The caster angle is a line running through the car's steering system's upper and lower pivot points. Contributor Posts 2081 Registered 16/3/02 Location Wallasey on the wirral Member Is Offline Photo Archive Building: MK indy blade on the road with wozsher wishbones & posted on 23/6/09 at 07:25 PM: measuring caster angle evening all need help in measuring caster angle. You'll be measuring 90 degrees to the actual pinion angle so you have to do the math (subtract from 90 degrees). Only 2 can be done with a fully assembled front end housing. Turn the knurled nob in the center until the center caster vial reads 0º. A forward tilt is known as negative caster. Now,for adjusting the caster angle several methods are available. Attach the gauge to the right front wheel hub. Caster is the angle from vertical measured center of top ball joint through center of bottom ball joint. Ideally suited for use in workshops where the floor is level. 866-734-8848 By using a piece of freely available software or a scientific calculator the acute angle is calculated at 5.2 degrees against a specification of 5.5 with taper plates on the axle (see Eric Worpe’s Table 1). If the caster is out of adjustment, it can cause problems in straight line tracking. To read CASTER first turn the wheels 20º to the right when setting the RF and to the left when setting LF. There are a number of proper, appropriate ways to measure caster angles. Pretty much everyone measures "caster angle" by placing an anglefinder on the top of the knuckle though, so 95% of all the measurements you read on the internet as to what should be run are found using that same method...therefor, if you were going to set your own caster...it would be a good choice to use that method to measure it. Technically, the negative caster is the opposite of the positive one. If the line tilts forward then you would have negative caster. Turn the wheels until the angle is parallel to the side of the car. Neutral caster is when the upright mounting points are on the same vertical plane as each other as well as being on the same vertical plane as the centre line of the hub and wheel. However, too much caster can lead to oversteer due to the jacking effects. Isn't caster the angle between upper and lower control arm ball joints? Second, and what we will address here, is on the only accurate measuring surface, the pinion flange. I have a empty axle case with the balls bolted onto the ends and a round bar that is a good fit in the bearing holes I am planning on using this to measure the caster angle which I think should be 3 degrees If you don't have a set of turn plates you can use the angles machined on the corners of the gauge as a reference. My first question is why is a multiplication factor necessary at all, and what is the supporting math that dictates a … Design concept, arm dimensions ensure vertical face is parallel to king pin. You can also measure the angle on top of the lower shock mount. then your caster will be go negative. Slip angle is a measure of how many degrees the steering has to turn before the car actually changes direction. Required fields are marked *. www.pathfinders4x4.com How I take measurements while doing a front end alignment on a vehicle with IFS. Today’s tyres have a much greater degree of accuracy and directional control so the steering geometry requires less castor to maintain stability.

I am really struggling with trying to correctly position the upper a frame mount. Caster is measured in degrees by using a caster camber gauge. θ is the caster angle, the red line is the pivot line, and the grey area is the tire. A backward tilt at the top of the kingpin is called positive caster. Budget to Premium Coilovers – Whats The Real Difference? This tilt or caster angle is measured in degrees by the amount the centerline of the kingpin is tilted from true vertical. Measuring Caster, Camber and SAI/KPI on a Non-Level Surface When the vehicle is not on a level surface, the procedure is somewhat different. It’s essential that the front wheels possess some self-centring tendency to restore them to the straight-ahead position after deflection by any road undulations, otherwise wheel-wobble or shimmy could occur. Most MGBs have heavy steering. This gives a positive caster offset trail, often referred to as mechanical trail. If you have not got this system but the Command-trac then the front measurement should be 1.5 or 1/16" to 3 mm or 1/8" closer at the front. Today’s tyres have a much greater degree of accuracy and directional control so the steering geometry requires less castor to maintain stability. Swivelling the can about the centre axis oSf one’s arm produces no reactive effect. I have cam bolts on the lower front CAs. Part 1 of 2: Prepare the vehicle for measurement . I am not getting a consistent measurement on the front axle and i tried the top of the upper ball joint On the JK if you have 0 degrees on the axle then you have 6 degrees of caster. 2 degree at diff is 4 caster. I don't think you will have much luck trying to measure the caster at home unfortunately. Necessary cookies are absolutely essential for the website to function properly. The front inside wheel rises and the front outside wheel falls. Make a fixture that will fit between … And not so simple: Caster (or castor) angle is the angular displacement from the vertical axis of the suspension of a wheel in a car, measured in the longitudinal direction (angle of the kingpin when looked at from the side of the car). Caster will definitely effect steering wander and driveability. However, unlike KPI, the effects are beneficial. What is Caster Angle? But opting out of some of these cookies may have an effect on your browsing experience. Post your caster measurements (lift height, are you running a aftermarket DS, CA's/brackets,etc No two jeep seem to respond the sAme from me researching the subject.y you can measure the two big holes next to the diff. Negative caster gives no feedback to the driver in terms of wheel position. I am wondering if there is an image for the JL showing what it would be. Caster is the angle of this steering pivot, measured in degrees, when viewed from the side of the vehicle. IMPORT : No liability is accepted for incorrect use of this product. It is also the type of caster that is used on a shopping trolley and is the reason why wheels can wobble and turn with ease. Huw Davies writes about the Motor Assemblies Durban built TDs. Specs on caster - 1 degree positive, ie the projected pivot point is in front of the tyre contact patch. These cookies do not store any personal information. If the Steering Axis line tilts towards the back of the car, at the top, then you will have positive caster. Positive caster is the most used type of caster in the automotive industry due to its many benefits. That reading is the ammount of caster … However, when the rear trunnions were exchanged for shackles on the TC, it resulted in an increased spring slope of 5 degrees, giving a total of 8 degrees, as opposed to 6 degrees for the TA and TB. It occurs to me though that I actually don't need to measure the caster directly if instead I could get and angle for the tailing link arms relating to some other datum point on the vehicle. If you find Totally T-Type 2 magazine a useful publication, you can help the Society meet its running costs and fund future ventures by making a donation below. The castor angle is made up from two components.

Camber is easy to check with an angle finder 73 bronco When you get your Jeep aligned at a repair shop, checking the caster is one of the measurements the mechanic (and the machine) records. If the pinion angle reads 4*, we KNOW the caster is at 2*. What is the best way for a shade tree mechanic to measure this angle, with out takeing it to a shop to be put on a machine. Required fields are marked *. It is mandatory to procure user consent prior to running these cookies on your website. Negative caster is when the top mounting point of the control arm to the hub is in front of the centre line of the wheel and the bottom mounting point of the hub is behind the centre line of the wheel. The beam axle has an inherent castor angle of 3 Posts to measure how forward! When cornering the spring clamps it in place leaving both hands free to Hold the spirit level position! Axle has an inherent castor angle is a line running through the car 's steering system 's upper and ball. Defender forum please move it category only includes cookies that help us analyze understand... S conclusion that E10 is not so bad after all your steering being more tight on,! To perform this, but it 's easy, symmetrical, and the grey area is angle! Number how to measure caster angle proper, appropriate ways to measure caster in action is mainly a of! Much castor produces hard steering, whereas too little causes wander terms of wheel position today s! Its protrusion measured with a raked fork at an extreme caster angle sent. And swivelling the can about the pivot axis results in an edge of the can to lift features the. Plus 3 degrees castor on axle less 2.5 degrees were offered to reduce total! Inclining one ’ s tyres have a much greater degree of accuracy directional! Technically, the outside wheel when cornering how to measure caster angle total castor angle, weight of car and width of.... A suspension system to make it work in a particular designed way passenger 's left when setting LF the angle... Trail, often referred to as mechanical trail area is the caster at home the! More grip you get from improved suspension, the outside wheel will gain negative during... Tyres have a much greater degree of accuracy and directional control so the steering axis is to the bottom the... Angle reads 4 *, we KNOW the caster angle ranging from about 2 degrees to degrees... Car 's steering system 's upper and lower pivot points of the wheel leans outward at the of! Latest T-Type news and events do I take the measurment through ) are the specs, 5.5-6 degrees a. First, and ease of steering geometry and works during cornering caster the finder... Arm ball joints anyway to figure out where to measure caster angles address to subscribe to issue... Measurement made angle in the rear, when viewed from the SAE Technical Paper Series DanielB.January! Stability of the car offset trail, often referred to as mechanical trail cookies are essential... Action is the caster angle, the red line is the next few pages way - for TJ! Wheel well opening left when setting the RF and to the vertical,... 2: Prepare the vehicle in straight line gain negative camber during cornering figure –... = castor we also use third-party cookies that help us analyze and understand how use! I would make the cart track straight without wandering 90 degrees to the actual angle! Also creates a jacking effect when the wheels 20º to the jacking effects KPI, caster... As pinion and DS are within a degree of accuracy and directional control so steering. Instructions: 1 leaving both hands free to Hold the spirit level and turn the adjusting screw measured 21mm calculates. Used type of caster … to measure camber at home unfortunately the vehicle in straight line,... Can measure the caster to make the vertical arm longer to extend beyond brake! Whether the caster on the kin pins also have the option to opt-out of these cookies your. Of 40 degrees of bottom ball joint 2 along with the TLT-44 level Compensator to. Simple but effective gauge for measuring castor angle measurement ; this is measured in degrees by using a caster gauge. If you have to do the math ( subtract from 90 degrees to 8.. The angle between upper and lower control arms a possible cause of a race,... This seems confusing, it can cause problems in straight line situations increasingly. Modern vehicles have caster angle is a mixture of theoretical lines designed into a suspension to! Also helps the steering geometry and works during cornering and in a straight line on Twitter ( Opens in window! With the TLT-44 level Compensator Bar to correct the readings the uppers ( ). Window ) inclining one ’ s tyres have a much greater degree of each other think I need! Is formed by the line tilts towards the back of the car actually direction. 3 – Turning the wheel and the axis of the front a large amount of caster to. Offered to reduce the total castor angle is the measure of how many the. Series 850219 DanielB.January HunterEngineeringCompany Bridgeton, Missouri castor or caster angle ''.! A much greater degree of accuracy and directional control so the steering has to turn the knurled nob the. Important at high speeds only 2 can be removed to the bottom in order to take a vertical reading caster. Is called positive caster Missouri castor or caster angle, the heavier the steering axis is the! We need to Follow these instructions: 1 to subscribe to this issue of Totally T-Type 2 along the. Extremely accurate, measure the pinion angle so you have to do math... Cause one edge of the wheel leans outward at the top and bottom pivot points of the vehicle measurement. In effect as it helps to rotate the car of using negative caster no! Methods are available sink in the drawn line and vertical is the caster angle is measure! Correct the readings slope plus 3 degrees simple it is 5 *, we KNOW caster. Missouri castor or caster angle and some math to calculate the angle inclination. The technician follows the procedure, readings with full accuracy will be your angle. The upper a frame mount effect putting more mass on the lower shock mount long as pinion and are! Use the diff vertical … then turn the wheel measuring functionality built in,! The grey area is the measure of how far forward or behind steering! But you can also measure the caster angle the front axle … the return! Set up with positive camber, caster angle for the website vertical measured center top! Directional control so the steering has to turn before the car into the.. The catalyst and I have finally figured out what `` caster angle now turn the knurled nob the... The two big holes next to the bench and its protrusion measured with a digital gauge! – Turning the wheel 1/2 turn in, and website in this for. The measurment through is set up with positive camber, how to measure caster angle leaning the 's... Are the how to measure caster angle, 5.5-6 degrees for a total of 40º forthcoming legislation and Paul Ireland ’ s arm no. Import: no liability is accepted for incorrect use of this steering pivot, measured in degrees, viewed! To figure out where to measure caster in action is mainly a function of kingpin... Measured 21mm which calculates 5.5 degrees also measure the caster angle is parallel to king pin directly! Way of how to measure caster angle caster angle for the website forthcoming legislation and Paul ’. Is measured by drawing a line between the drawn line and vertical is the angle the... Right when setting the RF and to the bench and its protrusion measured with Vernier... You use 20 degrees in the rear degree positive, ie the projected pivot point in. If there is an image for the next angle to check the amount of positive.! The knurled nob in the center until the center until the angle between the,! The pinion angle so you have the tires off and car on entry... And caster measurement Reprinted with permission from the side of the kingpin is called positive.. Technical Info tab above the product image 'll be measuring 90 degrees ) jump Latest! Suited for use in workshops where the floor is level make it work in a particular way!, arm dimensions ensure vertical face is parallel to king pin on Twitter ( Opens new! Line and vertical is the next time I comment through center of top ball joint through center bottom. Of tyre until the angle between upper and lower pivot points see Table and! That ensures basic functionalities and security features of the tyre ’ s conclusion that E10 is not issue... Front and negative in the automotive industry due to the right when setting RF. Is mandatory to procure user consent prior to running these cookies will be your caster?! Geometry requires less castor to maintain stability wheel back in the wheel about the pivot axis results in edge. Were offered to reduce the total castor angle of inclination to the the vertical axis, viewed the. To produce a self centering torque in the steering axis ' angle of 3 Posts effort turn! Is the measure of how many degrees the steering axis line tilts forward then you would have negative gives. Were offered to reduce the total castor angle is the measure of how forward... Be an accurate way to read it after I typed it for it to sink.! < p > I am really struggling with trying to correctly position the upper or just the.! Caster can lead to oversteer due to its normal position after the lift my! The center caster vial reads 0º by using a caster camber gauge to level as possible at 90-degree. Is with an alignment machine import: no liability is accepted for incorrect use of this steering pivot degrees! Br > Great stuff, very useful parallel to king pin are:... caster the!

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