Quote:
Originally Posted by Ol' Ron
Yes, the engine in my truck is a "stock" 280ci engine, a former 276 with rusty cylinders. I put a stock cam in it and bored it .020 with new Egge pistons. Now with the milled EAB heads I have aprox 8.2 CR so I can burn a lean mixture in cruise, But WOT is only 20 degs. This winter I plan on modifying a set of 8BA heads to see how small of a combustion chamber I can make with out running the flow. Might have some Brazing in the future.
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Ron , i think your 28 is a overlap of vacuum with mechanical..Vac is high and you have x amount and then vac drops and mech advance is high= x.
The typical vac advance is 14 degrees and the mech is 14 ( using a example) the 14 and 14 overlap as you cant have both at the same time . ( the reason for vac advance to start with) Engine then has 17 total all the time , thats the logic for using the vacuum....is that right ???
