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Old 04-16-2009, 06:45 PM
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Rzeppa Rzeppa is offline
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Originally Posted by SteveH View Post
(If you had accidentally connected 'manifold vacuum' to the advance module, you'd have full advance at idle, and none at full throttle').
You still get some vacuum at WOT, depending on RPMs. Higher RPMs=higher vacuum, but nowhere close to closed or partial throttle.

Originally Posted by SteveH View Post
My understanding of a 2F dist. (or most of that era) is that the mechanical advance provides the bulk of the total spark advance (perhaps up to 30-some degrees) and the vacuum advance just adds a few more.
It's actually around 20 some degrees of centrifugal advance; vacuum advance will vary according to the year of the (stock) distributor, and is typically around 7. This is info from various conversations with Jim C. over the years. My recollection is that vacuum plus centrifugal plus static is typically around mid-upper 30 max advance.
Jeff Zepp
Kittredge CO USA
1971 & 1976 FJ40s, 1978 FJ45, 1987 FJ60
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