03-27-2008, 06:58 PM
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CC Member
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Join Date: Apr 1999
Location: cleveland,
OH
Cobra Make, Engine: CSX4000, 427
Posts: 1,999
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Not Ranked
Quote:
Originally Posted by jwd
A vacuum advance unit (connected to a CONSTANT vacuum supply) is mandatory for optimum street performance. It will not only cause your engine to run cooler, you'll get better throttle response and MPG. There are plenty of articles written on the subject. Those that disagree, don't understand basic engine tuning and vacuum advance operation.
Jim
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I kind of agree with Jim. Unless you are running a vacuum advance on your distributor, no matter your mechaniucal advance setting, you are not optimal for cruising. The engine can tolerate, and benefit from more advance at low speed, low throttle cruising that can be obtained with a vacuum advance, and still preserve optimal (lower) mechanical advance settings for full throttle performance.
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"After jumping into an early lead, Miles pitted for no reason. He let the entire field go by before re-entering the race. The crowd was jumping up and down as he stunned the Chevrolet drivers by easily passing the entire field to finish second behind MacDonald's other team Cobra. The Corvette people were completely demoralized."
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