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At what compression do you have to run 100% race fuel. 11:1 Pump gas, 12:1 50/50?
 

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From The Stix 2 Da Brix
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I think about 11.5:1 is max for pump fuel in a 700. At 12:1 a 50/50 mix maybe good I'm at 13.25:1 so I run 110 a 50/50 mix of 93 and 110 is like 101 oct.
 

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You say 11:5:1 is the max for a 700 on standard pump gas. Is this the same for the 660?
 

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From The Stix 2 Da Brix
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I'm not very experienced with the 660. I know it's got different head design. I'd assume it's in that area though.
 

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What would be the max piston and cam I could put in my 660 to still run 93?
 

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anyone....
 

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Discussion Starter · #9 ·
11:5 I think would be good. I know with my build a 12:1 piston with my +4 crank is going to take me up to 12.75:1
 

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What would be the max piston and cam I could put in my 660 to still run 93?
My 660 had an 11:1 piston without a base gasket that was suppose give .5 point with a HC2 and I ran BP 92 without any detonation but my 700 with the 11.5 Tech pison stock cam does detonate. Maybe the cam would make a difference but I haven't had the extra funds lately.
 

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I ran a 11:1 piston with no base gasket and only one layer of the head gasket and had no problems running 93. This was with a stage 3 cam. I can't remember what the CR is with the base gasket and only single layer of the head gasket equals but I believe it boosts it up more then you would think.
 
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