Distributor question...

[Huw Powell]

> Was just wondering if applying boost pressure to the vacuum advance
> unit on the distributor on an 87 4KQ(T) would cause it to retard the
> timing?? Or does the diaphragm only go one way..

 From what I recall it can only go one way.

Vacuum and centrifugal force both advance it, but the static position is
essentialy all the way retarded.

There are some old turbo distributors (and others?) that have an advance
*and* retard servo on them.  Not sure if they use vacuum or pressure to
retard, though.

--
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/