Swingarm Modification and
Rear Shocks
The stock swingarm connects to a large coilover shock via
a progressive linkage, and for racing purposes works very well. For my
vehicle, the linkage is overkill and the shock is in the wrong place. I
removed the linkage, cut off the mounts, and the shock is in the discard
pile. My intention is to use a pair of smaller, preload-adjustable, coilver
shocks attached about midpoint on the sides of the swingarm and the other
ends secured to the roll loop, which is one of the strongest parts of the
frame.
In this drawing, the upper (tension) side of the
chain makes minor contact with the underside of the seat frame, but doesn't
touch the swingarm or pivot bushings.
When the rear suspension compresses, the upper side
of the chain make severe contact with the frame, plus touches the swingarm
bushings. The chain loosens, but only 0.16", which isn't enough to
worry about.
When the rear rises (under hard braking) the
chain doesn't contact the upper side of the pivot bushings.
This shows the optimized placement of the pivot
bushing. The seat frame will change to avoid the chain and UHMW wear strips
will be added to various areas for extra protection.
