Thread: head gasket and comp ratio

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Ive heard that if you put 2 gaskets it will reduce the comp ratio.but by how much? how much thickness would reduce the compression from 10:1 to 9.5:1

It depends on the bore and thickness of the gasket. The increase in volume from one gasket is:

pi*r^2* thickness r=bore diameter/2

If both gaskets are the same add them together and calculate c.r. again

If you know the compression ratio you can figure out the thickness of gasket material you need to add or remove to achieve your desired c.r. There are some c.r. calculators online you can use. Just play with the gasket thickness, get the desired comp ratio and divide the gasket thickness by the thickness of one gasket.

here is a quickie calculator

http://www.angelfire.com/fl/procrastination/motor.html

use real gasket thickness numbers and real piston relief numbers or else your result will be wrong

fel-pro head gastkets f1017-1. 10-9 cc f1037 9.7 cc f1047. 10-5 cc f1017-2 .13.7 cc. no way would i do that .your intake will not fit but if you want to do this cometic make supper thick head gaskets and that is the way i would go and thicker intake gastket and the push rods will be off .why don t you clean out the head chambers cc the head before and after i am shure you can get 10 cc or more by grinding and smoothing them out

Originally posted by earn_n_fbody
Ive heard that if you put 2 gaskets it will reduce the comp ratio.but by how much? how much thickness would reduce the compression from 10:1 to 9.5:1

Why would you want to do this?I would never recommend doing this.

yes yes head gaskets are made to be put between to flat you hope surfaces. they are not made to be stack why???? this is why they have a ring in them stack them get one gasket off and you done this is a hot spot for heat .this is a joke rigth ? when some one tells me they do not have piston to vavle clearances i have said stack the head gaskets now this is a joke

Pat I keep getting these headaches.Are you people for real?

what can i say this is not rigth .stacking head gaskets. i am shure someone has done this ? no way in hell would i. but i just hope he will not think about it