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vacuum advance vs. vacuum retard (archive)
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Posted by Corey Turner on September 25, 2000 at 11:10:49:

In Reply to: Re: what about sidedrafts? posted by WH on September 25, 2000 at 11:02:09:

Actually, if you were to try to use a vacuum sensitive ignition timing with sidedrafts it would _have_ to be a vacuum retard, as you would only be able to plumb for manifold vacuum, not carb vacuum.

At least from the way I understand it, if you are grabbing manifold vacuum (between the throttle butterflies and the head), then you are reading the degree to which the throttle is closed. If you are grabbing carb vacuum (outside the throttle butterflies) then you are reading the degree to which the throttle is open.

So when you open the throttles, manifold vacuum drops, and your vacuum retard diminishes. I don't think you want to drill into the carb bodies themselves to plumb for carb vac.

Me, I don't even have a distributor anymore, so this is all based on past conjecture.

Corey

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