Engine angle and IRS Angle

[parsonsj]

John, I fail to see how pinion angle has an impact on AS. AS is determined by the SVSA, which has no bearing on pinion angle (well maybe an inch or 2 but not enough to be a determening factor).

All suspension designs will have some pinion change throughout travel, it is virtually impossible to move the axle through a 6" travel and have 0 pinion change. Minimal perhaps but you can't say *no* change.

Sorry, I wasn't being all that clear. In the real world, it's the other way around. Setting up the SVSA for AS will change the pinion angle. Change the lengths or connection points of the linkage arms of the suspension, and most likely you'll change the pinion angle. This will be true unless you can rotate the housing mount points around the centerline of the axle ... which doesn't occur in the real world.



There is no change in pinion angle using the AME 4 bar. The upper and lower control arms are equal length and parallel. The connection points on the housing and the crossmember are equi-distant, and parallel. They form a perfect parallelogram. The SVSA is infinite. The pinion angle does not change through 6" of travel, and wouldn't change through 12" of travel (if that were possible in the real world).

jp