3LikesThread: need more compression
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12-03-2014 11:05 AM #3
CHR Member
- Join Date
- May 2003
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- Zephyrhills, Florida, USA
- Car Year, Make, Model: '32 Henway
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I have you at 10.2:1 Static Compression Ratio with that piston at +0.030. Too much for iron heads and pump gas, piston dome is about 23cc's.
Overbored 0.030", 0.020" piston deck height, shim gasket, 11cc piston dome, I get 9.3:1 static compression ratio. Same setup, but with 9cc dome, I get 9.16:1 SCR, so replace your present pistons with 9cc, 10cc or 11cc domes to get low 9's. Here's the piston I might use.....
http://www.summitracing.com/parts/sl...make/chevrolet
With that piston, 115cc chambers, 0.020" shim gasket, 0.020" piston deck height and bored +0.030", I get 9.25:1 SCR.
Here's the calculator I used.....
http://www.csgnetwork.com/compcalc.html
With a Keith Black KB203-030, I get 9.37:1 SCR.
.Last edited by techinspector1; 12-03-2014 at 11:19 AM.
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