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Discussion Starter · #1 ·
I need help with a performance distributor-advance question.
I know that the vacuum advance helps produce better response and mileage at
part throttle postions.

But if you disconnect the vacuum advance, and rely simply on mechanical,
what effect does this have on power/revability/acceleration?
I autocross a 240Z running 10:1 compression, which pings when the vacuum
advance is connected, and I would prefer to disable it.
But the ignition companies only seem to be able to answer questions on
Chevy's/Fords, and shrug when I ask this one.

I guess the question is this: On a L28 with SU's, what are the pros/cons of keeping the vacuum advance, or only running a recurved mechanical.?

Thanks anyone...

Bryan Little
Richmond,Va.
 

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This is what the How to hotrod and race your datsun book:
Vacume Advance provides advance in relation to load and therefore should be used on street driven engines.
Eliminate the vacume advance and gas mileage will drop, probable some spark plug fouling will occur and probably some loss of performance at off-idle throttle position will be experienced.
I would recomend a distributor that is made to run or built to work on mech. advance like the Mallory distributor sold by Victoria British. It costs 199.95 but will work with carbs well, is curved for performance.
 
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