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Author Topic:   Rear Roll Center
Dirt Roller

Total posts: 11
posted October 05, 2001 11:29 AM
I have a custom built chassis running only leaf springs on the rear. mono on the right stack on the left. other than that that's it. Just shocks and one coil on the right. I cannot find any info on rear roll centers for this set up. The car is extremly fast as is. any help?

[This message has been edited by rjjracing (edited October 05, 2001).]

Dirt Maniac

Total posts: 144
posted October 05, 2001 06:06 PM
With the leaf setup the rollcenter is built in and not very adjustable. Check the AFCO tech article on panhard bars.. I think they show how to determine the rollcenter on a leaf setup..

Dirt Newbie

Total posts: 2
posted October 05, 2001 09:55 PM
The roll center for multileaf or monoleaf rear springs is located at the vehicle center line at the height where the springs anchor to the housing. If you use a lowering block the roll center is half way between the top and bottom of it.

Dirt Forum Racer

Total posts: 79
posted October 05, 2001 11:15 PM
instead of the centerline of the car wouldn't it be a sraight line fwd to the center of gravity of the car?

Dirt Newbie

Total posts: 2
posted October 05, 2001 11:30 PM
I said it wrong. It is the center of the two spring mounts, laterally (left to right). The rear roll center is separate from the front roll center. The roll axis is the line from the front to the rear and is the theoretical axis that the body rolls during cornering. The Roll Moment Arm is from the center of gravity to the roll axis.
A lower rear roll center will transfer weight more vertically onto the tire and tighten up the chassis. Higher and it will loosen up the chassis.

Dirt Maniac

Total posts: 122
posted October 09, 2001 04:32 PM
The only part you left out was that if you are running two different spring rates in the rear (I know I am) the roll center is shifted towards the side of the car with the softer spring.

Dirt Maniac

Total posts: 103
posted October 09, 2001 04:38 PM
The softer or the stiffer side ??

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