Compression Question

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Aug 1, 2002 | 08:01 AM

#11

clemsongsr

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Joined: Jun 2002

Posts: 76

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Doesnt JE makes pistons with a compression ratio of 12.5:1? Is that CR streetable with 93 octane gas, aftermarket head gasket and aftermarket rods?

Aug 1, 2002 | 09:55 AM

#12

LOwrestling2001

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Joined: May 2002

Posts: 60

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From: Bay Area

11.7 for sure is streetable easily. my friend is running JDM ITR pistons w mugen head gasket on hits gsr...91 octane. btw are u 1qwkgsr? or no

Aug 1, 2002 | 10:00 AM

#13

jaymar88

HA.net Workout Krew

Joined: Mar 2002

Posts: 9,039

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From: In the gym

Quote:

Originally posted by evo119
I've seen as high as 12.0:1 on 91 octane gas, however that's on a properly tuned engine. IMO I wouldn't go that high...JDM ITR pistons are good enough. Or JE Pistions with the same CR.

12.0:1 sounds about right. I wouldn't run too advanced timing on that high a cr.

the cheapest way to up your comp?? milling the head.

Aug 1, 2002 | 11:03 AM

#14

evo119

GO GIANTS!

Joined: Jul 2002

Posts: 264

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From: Alameda, CA

It's pointless to run 12.0:1 CR if you have no motor work done...I.E. headporting, valvetrain, milling the head...etc. 11.0 to 11.5 is good enough for a street car with mild to moderate mods.

Aug 2, 2002 | 12:32 AM

#15

dubcac

Joined: Jan 2001

Posts: 56,525

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From: Westside til I die

You won't really feel much of a difference between 11.5 and 12:1 anyways. On 12:1 you can't run any advanced timing, in fact will probably require a degree or so retard on 91 octane to not detonate, but it's streetable.

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