Front "A" arm angle

[hookedonsand]

Just wondering what a good angle to have the front arms leaning back so the car rolls over the bumps best? I have 27x9x12 AMS front dune tires. I checked my wifes and my atv and they are 10*. I'm thinking that should be close.
Any suggestions?


Aleck

[Gene]

You are talking about "rake'. Opinions vary and you will read them soon. the Rorty R82 has 0. My other car has 6*. I don't have enough seat time in either to compare yet I think rake is good.

[minibajaman]

There is no right answer to this question, but I can give some background info. ATV's have 10 deg of rake because of their small tires. Larger tires need less rake since they inherently roll over bumps better. Rake tends to induce more diving under braking then without. My buggy has 10 deg of rake and uses ATV tires, and I can't directly compare it to anything but it does work well although there is some brake dive. That said, if I were to design/build another buggy, I would probably still run some rake but less, maybe 5 deg.

[yoshi]

Brake dive can be eliminated by raking the upper arm more than the lower, and the brake dive only comes into effect when you have front brakes...


I run 12 degrees of rake on my setup with parallel mounts.

With diagonal mounts on my first generation, I ran 15 degrees to help compensate for the forward sweep of the arms in that particular setup...