Posted by DDD [162.158.255.121] on Thursday, November 01, 2018 at 09:16:22 :
In Reply to: Ignition QUESTION: Vacuum advance VS mechanical weights posted by DDD [172.68.133.225] on Thursday, November 01, 2018 at 09:01:03 :
http://www.t137.com/archives/wwwboard17/messages/443.html
As the replyer wrote:
"In a vacuum advanced distributor, the spark is
advanced based (at least partially) on increasing
manifold vacuum.
In a centrifugal advance distributor it's strictly
rpm.
As Henry mentioned, advance based on rpm is
blind to load: you're approaching a hill and
your timing is happily moderately advanced based
on your rpm, but as you begin to climb your
rpms don't go up, so you don't get any more
advance.
In a vacuum advanced distributor, the engine would
begin to work a little harder up hill, draw a
little more manifold vacuum and advance the spark
some.
Aren't most (all?) vacuum advanced distributors
really vacuum AND centrifugallly advanced?"
Anyone swap out their original power wagons MECHANICAL unit for a VACUUM type and notice a big difference in hills?
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