Vacuum question
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,114
From: Crossville TN
Your question cannot be answered...at least, not in its present form. Much more information needs to be known about the engine and its internal components...specifically heads and cam...before this question could be answered legitimately. Depending on the engine's ability to produce vacuum (very dependent on heads/cam/etc), and the engine's preference for how much vacuum advance is needed for it to idle smoothly and efficiently, the proper vacuum advance can needs to be selected. There are many advance cans, so that a resonable choice can be made for every possible 5.7L engine configuration.
Le Mans Master
Joined: Mar 2008
Posts: 5,948
Likes: 72
From: Oxford MA-----You just lost the game!!!!
The answer to your question is: Take the timing at idle, let's say it's 16*. Take the amount of mechanical advance, let's say it's 20*. Add these two numbers together, and we have 36*. The difference between this number and 52, is where you should aim for with vacuum advance. In this case, it is 16*.
Scott
Scott
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