Quote:
Originally Posted by Steve C.
For interest only..........
Dynamic Compression Ratio
(Will my engine run on pump gas?)
http://cochise.uia.net/pkelley2/DynamicCR.html
7.5-8.5 DCR / 91 octane or better.
Another source... Desirable for a street engine, staying below 8.25 is probably best for trouble free motoring.
Use this to determine intake closing point in degrees
http://www.wallaceracing.com/cam-deg-calc.php
And remember to use seat duration, NOT .050" duration (even if the factory cam does not use .006" tappet lift. It will be good for conversation )
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So both cams put me in the same category, 91 or better.
I know that 93 octane still needs booster with the 2157.
Using a ratio it looks like the 068 would knock me down to 10.7 to 1 from 11.5 to 1.
Probably still need booster for the 068.
Lots of things sound good until you actually crunch the numbers.