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Quote:
Originally Posted by 334charlie
Bubba what numbers do you think if i add vacuum advance?
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The vacuum issue is another story.
Typically vacuum is 12 degrees and mechanical is 12 degrees (distributor degrees) Problem is the mechanical is at lets say 3000 rpm=12 and 18 inches of vacuum is also 12 . Problem is you will never have 3000 rpm and 18 inchs of vacuum at the same time , especially under a load of any kind.
So they overlap each other .
You may have 6 degrees mechanical and 6 degrees vacuum advance making the total 12 (24 engine) etc.....
OR you could have 10 degrees vacuum and 2 degrees mechanical (low rpm) and still have the 12 .
The vacuum is typically good for 2-3 mpg on a standard vehicle .
Kinda hard to tune on a flathead .
