Cosworth High Performance Head Gasket

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Dec 19, 2008 | 06:31 AM

#16

ablaze

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From: Oregon / Singapore

so end of the day, will changing the gaskets to the thinner 1.1mm gain me anything from the stock gasket?

Dec 23, 2008 | 06:13 PM

#17

Tim@AMSperformance

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Quote:

Originally Posted by DRAG

These motors have stupid low compression as is. This is a more efficient combustion chamber than the 4G and a better resistance to detonation. There should be no reason to want to lower compression IMO

If I'm not mistaken these motors have higher static compression ratios than the older Evo's. I believe that it is 9.0 to 1. So if you did use a little thicker gasket the compression may drop just a little.

Dec 25, 2008 | 11:42 PM

#18

DRAG

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Of course it would, but for what reason would you want to lower compression below 9:1?

Dec 29, 2008 | 09:02 AM

#19

4G63DSM

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From: In front of a Catia screen

Quote:

Originally Posted by DC_TypeR

The only time you want MORE compression is w/ ALL MOTOR set ups.

Boost - Lower the better.

Also, like Speedclinic stated :

The evo 1-9 are timing belts - 4G63 motors
The evo x is a timing chain 4B11t

by this logic everyone should be running a 2:1 compression ratio... good for boost right?