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Old 04-15-2008, 07:54 PM
Bull_81073 Bull_81073 is offline
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I'm not sure what a stock vacuum advance canisters curve is but I am almost positive that it adds advance as the vacuum decreases. This only makes sense as the motor needs more advance as the RPMs are increased. Increased RPMs means that the throttle is open more and therefore has less vacuum. It would be counter productive to retard timing with the canister when the mechanical advance is trying to add it in!
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