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Author Topic:   Factory Front Roll Centre
redneckdad22
Dirt Newbie

Total posts: 2
posted July 24, 2005 07:50 PM  
I am new to this board, so I apologise if this has been covered previously. With all the A-arm pivot points (top and bottom) running on angles, both front to back and up and down, (mostly the top a-frame), how is the front roll centre height determined. The cars I am working on are metric Chev. and 70's Camaro. Anyone know for sure ? Thanx Red22

modi25
Dirt Full Roller

Total posts: 26
posted July 26, 2005 09:45 PM  
you have to take measurement for at both pivot points on upper arm and then average, do the same for bottom pivot. like on the upper arm if the front pivot is 19" and the rear pivot is 20" from the ground then you would use 19.5" for your measurement. does that make sense ?

redneckdad22
Dirt Newbie

Total posts: 2
posted July 27, 2005 07:26 PM  
Thanx for the reply modi25. I understand what you mean, but it can still be confusing as the upper a-frame not only spays out (front to back) approx. 20 degrees from the centreline of the chassis, but also runs downhill (front to back) approx. 10 - 15 degrees. So the inner, pivot point of the upper a-frame is a point in space that has nothing in common with either of the two projected lines through the two pivot points. I have been involed with dirt track street stock type of cars since 1972. The days of setting up a street stock type of car with just basic front end alignment, wedge, stagger and air pressure may be numbered as we are starting to reposition upper a-frame mounts to set caster, camber and possibly roll centres to a more optimum position. Didn't mean to run off, but I think that there is still much to learn. Sorry for the novel.
Red22

    

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