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Increasing the CR

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Old Feb 11, 2005 | 11:40 AM
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Default Increasing the CR
Can I increase the CR with changing the gasket only?
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Old Feb 11, 2005 | 11:57 AM
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yes..
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Old Feb 11, 2005 | 12:01 PM
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ok, that given, can i lower the CR with a gasket swap and by how much?

Im at 11.1-.3 and would like to lower if possible in the future for a FI kit
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Old Feb 11, 2005 | 12:05 PM
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That's good,, which gasket can I use with the stock heads: .030'', .040'' or!! and what CR will I get?
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Old Feb 11, 2005 | 12:27 PM
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... And if he did so how much HP will he gain? Does it help?
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Old Feb 11, 2005 | 12:28 PM
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Originally Posted by jrp
yes..
Yes... but?

(Or was that a typo?)
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Old Feb 11, 2005 | 12:39 PM
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Originally Posted by obZidian
ok, that given, can i lower the CR with a gasket swap and by how much?

Im at 11.1-.3 and would like to lower if possible in the future for a FI kit
yes you can lower with a thicker gasket but you'll end up with a less then ideal quench, especially with the thickness of the gasket you'll need to lower 11.1-11.3 to a boost friendly level

just throw on som 6.0 heads to lower the CR.
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Old Feb 11, 2005 | 12:42 PM
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Originally Posted by Chevy99
That's good,, which gasket can I use with the stock heads: .030'', .040'' or!! and what CR will I get?
.040 will give you a ~.032-.035 quech and 10.7 - 10.8. assuming stock deck height and 66cc chambers
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Old Feb 11, 2005 | 12:43 PM
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Originally Posted by black_knight
Yes... but?

(Or was that a typo?)
no typo, just trying to get the 5 charactor limit..
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Old Feb 11, 2005 | 12:44 PM
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Originally Posted by TheMNkid
... And if he did so how much HP will he gain? Does it help?
a full point of CR 10.1 to 11.1 is generally worth a 4% increase across the board. gains are more beneficial with a larger duration cam.
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Old Feb 11, 2005 | 12:49 PM
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Originally Posted by 2MuchRiceMakesMeSick
He will lose HP, not gain. Lowering the compression is necessary in FI applications
the thread starter will gain hp though . the other guy will loose power, yes.
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Old Feb 11, 2005 | 12:52 PM
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Yeah. I read it wrong. I thought he wanted to lower his compression
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Old Feb 11, 2005 | 01:05 PM
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OK, I will get .040'' gasket, but do I need to tune the PCM for that?
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Old Feb 11, 2005 | 01:10 PM
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you could add a bit more timing if you wanted to provided you get no detonation.
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Old Feb 11, 2005 | 01:16 PM
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Thanks bro......
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