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06-11-2009 02:51 PM #5
CHR Member
- Join Date
- May 2003
- Location
- Zephyrhills, Florida, USA
- Car Year, Make, Model: '32 Henway
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- 12,423
Posted by thebigblue:
"How did you arrive at 8.1 ?"
727.35cc's plus 64cc's plus 8.65cc's plus 12cc's = 812
64cc's plus 8.65cc's plus 12cc's = 84.65
812 divided by 84.65 = 9.59:1 SCR
In the KB calculator, enter 9.650 compression ratio, enter 3.480 stroke, enter 5.700 rod length, enter 57.000 intake closing point (intake valve closes at 42 degrees ABDC @0.050" tappet lift. Add 15 to that and enter 57.000 into the calculator).
Result: 8.103:1 DCR.
"my main concern is detonation and the impact DCR and SCR have on it as well as trying to get a good quench. these three things aren't playing nice with each other."
The numbers work out fine. Cut the block decks to square them up and achieve zero deck height. Use a 0.040" gasket. The only thing that concerns me at this point is the configuration of the piston crown. If you don't have enough squish pad on the piston, you've shot yourself in the foot.Last edited by techinspector1; 06-11-2009 at 03:07 PM.
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