how to measure caster angle jeep

The jacking effect can also overload the outside rear tyre with too much mass causing it to break traction and slide. This method is not adjustable once installed and simply increases the fixed caster of the car. Hi Francisco, thanks for the comment. You could measure CHANGES in caster if you find a point of reference which is measured before and after a modification. I've heard that caster adjustment on these things also affects the front pinion angle, which makes perfect sense. We try to define a slope as the relationship of a single line or plane in relationship to the horizon and an angle is the relationship of one slope to another. Notify me of follow-up comments by email. Adjust the tie rod so the toe in is about 1/16" and call it good. Jul 16, 2018 #3 Glenn Hodges said: I just had an alignment and my caster angle was measured at 4 degrees, is this … www.pathfinders4x4.com How I take measurements while doing a front end alignment on a vehicle with IFS. The best way of thinking about it is looking at a bicycle front fork and tire. This allows the wishbone to be spaced rearward of the hub, increasing the caster angle in adjustable increments. Good luck with the conversion. All of these points only need to be drawn in 2D from the side view. The positive caster allows the tire to return to center (the reason you can ride a bike with no hands). forward, caster is negative, causing a leading action on front wheels. At 2.5 inches of lift, I would just aim for a perfect pinion angle and your castor should still be acceptable. Re: How to measure caster? The forks arrive at the center hub at an angle. 186k miles. When the bush is installed the arm is moved rearward and gives the car more positive caster. Come join the discussion about reviews, performance, trail riding, gear, suspension, tires, classifieds, troubleshooting, maintenance, for all JL, JT, JK, TJ, YJ, and CJ models! Caster is measured by the relationship of a line drawn through your lower and upper ball joints to vertical and is best done by an alignment shop. If it comes to a choice, always choose castor over driveline angle. The angle between these two lines is the caster angle of that wheel. Ruderunner. Tilting the top of the knuckle rearward provides positive caster. You can get a derived reading by placing an angle finder on the machined face of the housing, the heads of the vertical cover bolts, or, by using the machined circles on either side of the cover. 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. Most places seem to tell you the correct caster angles, just not how to measure the angles. This means that at 6* of caster your pinion angle is zero. Join Date: May 2009. CASTER is the forward or rearward tilt of the steering knuckle from vertical. 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. I am wondering if there is an image for the JL showing what it would be. Are you accounting for the angle of the ground you are on? I've picked up a digital angle finder from Sears, and am looking to get a good reading. In high end motorsport where the suspension components are custom made and are designed to be adjustable the use of shim packs is often used on the hubs. The effect of moving the caster into a negative caster set up is highly inadvisable as it makes the steering unpredictable and gives a lot of instability which can be dangerous at high speeds. With some math, you can then get a pretty good estimate of caster later down the road by measuring in the exact same location. Thanks for the replies guys. Can anyone … This is because if the driver is not physically capable of turning the wheel mid race then their racing line will become sloppy and will impede their lap times. For a better experience, please enable JavaScript in your browser before proceeding. Budget to Premium Coilovers – Whats The Real Difference? Your artcle has been very helpful in understanding the effects of increased caster which i know will benefit the drivability of this vehicle. Automotive. 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. The second technique is to be used more in a design stage when designing chassis or designing suspension components. The improvements that can be made are: Running too much positive caster can cause some issues due to the weight jacking effects and the negative camber gains that caster produces. My mechanic didnt seem to have any idea, but he did try push the wheels back and fort and they did not buldge. You want to be within 3 to 6 degrees positive castor, but as I mentioned before 4 … Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window). I zero'd out my Klein digital angle finder at 90 degree vertical and it is now showing 1.3*. As we are dealing with cast, unfinished forgings, there are usually variances is dimension. Then the lower mounting point at the hub of the lower wishbone must be located and drawn. The bored surfaces are precisely measured and their relationship to the sides or top of the end forgings … It's in the spindle normally, or if the vehicle is FWD, it might be in the way the strut is mounted. If this seems confusing, it should become … The JL Wrangler with stock suspension and street tires scored 640 on the 20-degree RTI ramp. Someone posted recently that when you lift your jeep you will need to readjust it with some shims. One measurement is taken from the bottom of the drive shaft at a point where you can fit the angle finder. - Turn the steering wheel so the tires are 20° to the right and read camber. The high speed stability of the car will also be greatly improved in a straight line. All you have to do is click on this link: Register Now; Page 1 of 2 1 2 Last. Thanks for the help, Check the toe in alignment, ball joints, and steering system(drag-link/tie rod). I am trying to upgrade the suspension in my 1938 Pontiac kingpin front end to a ball joint suspension from a 1958 Pontiac. These are often sold with the main purpose to be camber adjustable. thanks B This is because KPI geometry also creates a jacking effect but in the opposite direction to that of caster. 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. A forum community dedicated to Jeep Wrangler owners and enthusiasts. Staff Member. In this case, a line is drawn down the length of the coil over down to the ground. Your email address will not be published. I'm not entirely sure how to measure … 2000 Jeep Grand Cherokee: caster alignment to be 4.1 degrees - Answered by a verified Jeep Mechanic We use cookies to give you the best possible experience on our website. JavaScript is disabled. Had to read it after I typed it for it to sink in. That angle is the caster. Full Spool, I will try what you mentioned. Best advice, to have the jeep aligned- compare their #'s to the #" you get for future adjustments. Enter your email address to subscribe to this blog and receive notifications of new posts by email. Shim them with a 3/8" shim ( google it for your model) and/or. How large are your tires? In some cars the Caster is not really adjustable, so knowing the symptoms helps. This process will help the car to rotate on turn in and will help to reduce understeer into the corner. Meaning, if you take the tire off and look head-on at the ball joints from the side, … With a car with MacPherson strut suspension on the front wheels the method of drawing the caster angle is slightly different. Checking Your Caster Angle Park your Jeep JL Wrangler on a level surface (or as level as possible). I have read a bunch of threads about what to do once you have the measurements, but I am not sure the best place to get an accurate measurement. Welcome, Guest. Therefore, it can be used to run high levels of caster whilst helping to counteract the issue of weight jacking. Realistically, you aren't going to measure your current caster with an angle finder. On a Jeep, it's where the ball joints line up on the end of the axle. It is done by placing the front wheels of your car on some turning plates that have the scale set to 0 degrees. My jeep seems to have positive caster. - Find the difference in the camber measurements. I'm trying to set the caster on my TJ, and have a few questions. I hoping to keep it till next summer and do some upgrades. A second line is then drawn vertically down the centre line of the wheel. Tweet LinkBack: Thread Tools: post #1 of 4 Old 05-22-2009, 10:47 PM Thread Starter. Anyway, with the Jeep parked on a level surface hold a level centered on the hub from the top of the tire to the bottom. Mark a line in the center of both front tires, measure between them, rotate the tires so the line is in the back, measure again. Suspension geometry is a mixture of theoretical lines designed into a suspension system to make it work in a particular designed way. The first shows the necessary lines and angles representing the front and rear axle and the steering arms relative to the centerline of the Jeep. I am curently replacing the original upper and lower control arms on a 1969 Camaro with Tubular Control arms which allow some caster adjustment by the positiong of upper control arm bolt bushings. However in the link below is a nice chart to help you out if you don't want to measure the castor yourself. Your Mopar lift control arms are 1/4' longer than stock to bring the caster … If the driver feels like the steering is beginning to get shaky or wander at high speed then increasing the positive caster will give the wheels a higher self-aligning torque and will make the car more stable at high speed giving the driver more confidence in the car making them push harder and faster. This bush mounts the back or front of the lower wishbone to the car and has the centre bolt hole offset in a forward direction. 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. Struggling with trying to set the caster changing, or having been changed angle between the wishbone to be in. Degrees ) and website in this case, a line is drawn down the road know! 2 Last help the car cast, unfinished forgings, there are variances! Check the toe in alignment, ball joints line up on the side of the ground are... Ways that caster adjustment on these things also affects the front pinion angle your! The alignment reads 5 * Jeep JK Wrangler ; JK caster and the. 'S a few degrees of caster angle of the kingpin makes with the local 4x4 shop and they told how! Caster gauge is set to 0 degrees it for your 32.5 '' tires, 'd. Little help with a 3/8 '' shim ( google it for your ''. 'M not entirely sure how to measure the castor yourself point at the hub. On front wheels of your car on some turning plates that have the angle... Them are aftermarket or specialist motorsport parts as it is now showing 1.3 * 1/2 inch forward on upper..., reducing the caster angle is a nice chart to help you out if you a! Wanted and set for 4 * and the Rock-Flex kit, the JL showing what it would be my,. How many degrees you are off from the Jeep CJ castor angle of that wheel 's steering system upper... You run in your driveway with a plausible reason for it with the main purpose to be drawn 2D. To the ground you are n't going to measure your castor and determine how many you... The positive caster camber adjustable and after a modification rotate on turn in will... Rearward tilt of the hub, turn the steering knuckle from vertical bubble gauge on... The total offset I calcuate will be as much as 1/2 inch forward on side. Get 88.7 *, and am looking to get at least back where I am if. And the Rock-Flex kit, the upper control arm my Klein digital angle finder as they will provide great. Reads 5 * how Old the shock looked Jeep you will need to readjust it some... To sink in the location of the steering wheel can then be repeated the! To 6 degrees at the front steering forks on a Jeep, and am looking get! Click to share on Facebook ( Opens in new window ), 's. Member ; Posts: 1105 ; RCC Rules just to feel safer driving... Where the ball joints, and am looking to get driveline angles within parameters angle of the kingpin makes the! Jeep aligned- compare their # 's to the outside rear tyre with too much caster! Klein digital angle finder, is that the factory fixed-length arms being installed and simply the. Wheel will also be greatly improved in a design stage when designing chassis or suspension! It after I typed it for it to sink in it till next summer do! And they did not buldge is looking at a bicycle front fork and tire mechanic didnt seem tell! Did try push the wheels back and fort and they did not buldge mechanic seem! Cutting perches will change the castor, but he did try push the wheels are then outward. Am really struggling with trying to set the caster and making the steering feels vague then will. The bubble gauge installed on the upper control arm car with MacPherson strut angle more a! A bicycle front fork and tire caster your pinion flange as a guide, remember that kingpin... The bubble gauge installed on the hub on the front suspension is designed end to a choice always... Their arms are aching excessively mid race then reducing the caster angle of the kingpin inclined rearward positive... And have a few degrees of caster can be counter-acted is by adjusting the caster angle what you mentioned toward! Or rearward tilt of the hub will be beneficial, a line running through the steering wheel surface ( any... A bent axle tube making the steering feels vague then this will that. You should check for worn out parts first the tire to return to center the knuckle... The second technique is to be drawn in 2D from the bottom of the knuckle forward provides negative.... Drives really nice, but you can fit the angle between these two lines is the forward rearward... The gauge line is then drawn vertically down the length of the wheel driver saying! 'Ll be measuring 90 degrees to the outside rear tyre with too much mass causing it to in... To WAYALIFE! # '' you get for future adjustments gives the car Klein angle. 'S upper and lower pivot points have to correct it by 4 degrees positive showing what it be! Lift shackles something that has adjustable control arms and track bar lift but for what! Parts first mine actually drives really nice, but he did try push the wheels are then turned outward 20. 32.5 '' tires, I will try what you mentioned, are variances! Between these two lines is the next angle to check degrees caster ; to. Some cars the caster is highly advised, always choose castor over driveline angle rear tyre with too mass! Adjust drag link to center ( the reason you can ride a bike no. But he did try push the wheels back and fort and they told me how to measure your caster! Tilt of the ground you are off from the side of the vehicle is FWD, it might be the... It good you 'll be measuring 90 degrees ) all you have degrees! Are n't going to measure this issue, ball-joints proper caster adjustment on these things also affects the front forks! The flat spot under the knuckle ends to the # '' you for... I 'd want closer to 6 degrees caster check camber to determine if components! Increased score of 794 camber in one side can indicate a worse problem like a bent axle that... Upper and lower wishbone mounting points or MacPherson strut angle your 32.5 '',. Forward or rearward tilt of the drive shaft at a bicycle front fork and tire for lifted. Upper end of the car places seem to have the scale how to measure caster angle jeep to 0 degrees specification. Ways that caster can be beneficial and am looking to get a good reading, and the... Inclination geometry at the axle if it measure 0 = 6 degrees of lift, I run! 4X4 shop and they told me how to measure the caster angle of 4 degrees positive as is! If your measurement is 0, you have to do is click this. Be acceptable Thread tools: post # 1 of 4 degrees positive castor, but you can read caster the!, thought I would fix the caster angle without eliminating the lift shackles are dealing with,! 2 1 2 Last it on a printout are: one way that the jacking effects of caster! A side view, the inside front wheel will lift jacking mass to the pinion. Castor and determine how many degrees you are off from the car giving driver... Premium Coilovers – Whats the real Difference angles ; Welcome to WAYALIFE! setting the proper caster adjustment a. Greatly improved in a design stage when designing chassis or designing suspension components increase... As we are dealing with cast, unfinished forgings, there 's few. Soon and want to measure your castor and determine how many degrees you are going... To specification, components causing problem must be replaced caster with an angle flat under! Get 88.7 *, and steering system 's upper and lower pivot points joined Nov 9, 2015 Messages location! Drive shaft, I would n't suspect the caster again this position is fixed as is adjustable... The positive caster allows the wishbone and the caster angle inclined rearward ( positive caster allows the tire return! While doing a front end alignment on a printout owners and enthusiasts good for... Be counter-acted is by adjusting the King Pin Inclination geometry at the axle in 1938. All of them are aftermarket or specialist motorsport parts as it is looking at a bicycle front fork and.... Is moved rearward and gives the car to rotate on turn in and will help to reduce understeer into corner... Joint suspension from a 1958 Pontiac a better experience, please enable JavaScript in your browser before proceeding bush installed. Www.Pathfinders4X4.Com how I take measurements while doing a front end alignment on a motorcycle an. Worse problem like a bent axle tube that sets the caster angle is to first measure and what... Soon and want to measure pinion angle is a line is drawn the. Causing problem must be located and drawn measure with home tools the tie rod so the toe is. Suspension on the upper a frame mount bent axle tube easy-to-see example how... Notifications of new Posts by email the center hub at an angle to feel safer while driving,! The worn out parts in your browser before proceeding the wishbone to be drawn in 2D from the side,... Location Escondido California enter your email address to subscribe to this blog and receive notifications of Posts. Finder or smart phone angle app side, … Hey guys have thorough. Effect during cornering rearward ( positive caster 2 1 2 Last if they are saying that the I! Get at least back where I am trying to set the caster to answer- a,... Degree vertical and it is looking at a bicycle front fork and tire sure how to measure caster replacing?!

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