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Old Apr 26, 2011 | 01:50 PM
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Default Dynamic Compression

Can someone calculate DCR for me for this combo?

Stock Ls1 shortblock, 60cc heads, TSP 224R 114LSA Cam. Stock MLS headgasket.
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Old Apr 26, 2011 | 01:56 PM
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Depending on the advance ground in, between 8.5 and 8.8ish
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Old Apr 26, 2011 | 02:02 PM
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6.84 is way too low. Something is wrong.
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Old Apr 26, 2011 | 02:41 PM
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So long as you didn't order it "custom" with a different ICL than standard, you will net about 11.1:1 static, and about 8.7:1 dynamic.
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Old Apr 26, 2011 | 08:22 PM
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8.7:1 hmm.... a bit high for 91 octane. Should I change cam or run a thicker head gasket? or just run slightly less timing?
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Old Apr 26, 2011 | 09:00 PM
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Running a thicker head gasket is almost always the wrong way to reduce the
compression. Perhaps get the TSP 231/234; seems real popular, nice idle,
and very streetable with the right tune. You have enough static comp for it
to work well
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Old Apr 26, 2011 | 11:08 PM
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How is any of this useful without knowing what elevation the OP lives at? In Denver, you can run more DCR on 91 octane than you can in Death Valley.
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Old Apr 27, 2011 | 01:02 AM
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How much dynamic compression can you run at 2000 feet with 91 octane??
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Old Apr 27, 2011 | 01:23 AM
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Sea level. I am in socal.
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Old Apr 27, 2011 | 09:54 AM
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I'd agree it'd be more beneficial to retard the cam rather than running a thicker gasket!
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Old Apr 27, 2011 | 12:02 PM
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The real issue is the cranking compression. Going for, say, 200 psi ( safe on pump premium ) takes both more SCR and more DCR in Denver than in Death Valley. But 200 works wherever you are in this nation.
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