Re: Disconnect distributor advance? - Saab Vintage Models Bulletin Board - Saabnet.com
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Re: Disconnect distributor advance?
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Posted by kansas (more from kansas) on Wed, 13 Aug 2014 19:02:34 Share Post by Email
In Reply to: Disconnect distributor advance?, -jsaxcski2, Tue, 12 Aug 2014 14:27:08
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>>Is it possible to run distributor (Pertronix electronics) and Weber 34ICH without connecting vacuum advance on distributor? (Plugging off vacuum)

Sure. Not the best idea for performance, emissions, or fuel economy, but you can do it.

>>Timing is fairly good with engine at cranking,

I've no idea what "fairly good" means. Is it correct, or not?

>>but is "heavily" advanced with vacuum advance;

Likewise, no idea what that means. Timing should advance a specified amount give or take 2 or 3 degrees with vacuum, and an additional amount with mechanical (centrifugal) advance. I don't recall the numbers but can find them if you need. Advance can be measured most easily with a timing light designed to display it, and a little less easily with a plain light with no display. Timing specifications (Base, Vacuum, and Centrifugal; the sum of these is Total Advance) can be expressed in crankshaft degrees or distributor degrees, and it is important to know which kind of spec you are reading. 2 deg of crankshaft rotation = 1 deg of distributor rotation.

>>plus the advance does not seem to "drop back" after raising rpm's

Then your distributor needs repair. If you get that dealt with, you probably won't want to disconnect the vacuum any longer.

>>Probably emissions would not be that great with vacuum advance disconnected.

Mostly you won't be able to get out of your own way.


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