[DeTomaso] Vacuum Advance - ported or full vacuum source

[gow2 at rc-tech.net]

Simple answer.


With ported you have no vacuum at idle. Manifold you have vacuum at idle.

You gain the ability to advance your timing at idle with Manifold. This
gives you better throttle response and can help the engine run cooler.

Switching from ported to manifold you might end up with more total timing
then you had which means you might need to reduce total timing.

Gary





>
> Does anyone have an opinion on which source I should use for my vacuum
> advance on my Mallory Unilite distributor, full vacuum directly from the
> intake manifold or ported vacuum from the Holley 650 double pumper?  I
> have a mostly stock engine with an Edlebrock Performer intake manifold.  I
> have recieved conflicting information from Holley and Mallory, Holley
> claims that I should use the ported vacuum at the carb and Mallory said I
> should use full vacuum from the intake manifold.
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