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Distributor advance vacuum point - before or after the throttle 140-160

posted by  Rhys on  Sun Jan 16 14:51 CST 2011
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last visit: Tue Nov 20 10:22 CST 2012
[RELATED]

I don't know what a 085 distributor is. I do know that if you have a B20B distributor the vacuum unit acts to retard ignition timing. The B20E and F did that as well, and it serves to reduce peak combustion temperature, at the expense of fuel mileage.
There are two sources of vacuum - intake manifold and "ported". Intake manifold will be highest (lowest pressure) at idle and decel. Ported provides vacuum just off idle during part throttle cruise, and a bit at idle. It's source is the region at the edge of the throttle plate when nearly closed.
If yours is a retard unit, don't hook it up at all.
Many Canadian market 240's with single SU's had a dual diaphragm which had advance and retard in the same unit. The retard side was hooked to the intake manifold in those cases, advance to ported.






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