Senior Tech Team
Join Date: Apr 2012
Location: Yerington, Nevada
re: ZZ4 upgrades?
Factory ZZ4 timing settings are as follows, INITIAL, 11, mechanical, 22, total of 33. Vacuum advance is 69150, no limiter.
The engine being 10.25:1 c/r, I usually add a degree to the INITIAL, for 12, + 22 = 34, and limit the vacuum advance to 8, or 10 degrees on full manifold vacuum, which gives IDLE of 20/22 degrees. The only other function needed is to speed up the mechanical advance, it is far too slow, to compensate for the ported mess of a vacuum advance.
This isn't Secret Sam stuff, it is really easy to do, stop for the vacuum advance degrees, source from full manifold vacuum, softer mechanical advance springs, done.