RE: Timing Question

["Bob Palmer" <rpalmer@ucsd.edu>]

Ron, Steve,

Here is a link to a Crane article that is informative on this topic. Vacuum
advance allows the engine run much more advanced (and more efficiently) at
light throttle than with only mechanical advance. When you open the
throttle, the vacuum level decreases and the advance drops back into the 36
degree range to avoid pinging.

http://64.90.9.168/cranecams/pdf/272e.pdf

Bob Palmer
rpalmer@ucsd.edu
rpalmerbob@adelphia.net