How thick are the top and bottom layers of a cometic headgasket, I had a 0.060" and an 0.036" cometic H.G. I used a top layer, and the two thick layers of the 0.060" and the 0.036" H.G. Didn't use a bottom layer. So i was thinking i should be at around 0.075" or so. I left out 1 top and 2 bottom layers of the cometic H.G.


Modified by all-mtr-teg at 12:18 PM 9/16/2007

 

Just curious, why didn't you use a stock headgasket instead of the thicker than stock Cometic ones?

 

head had been milled 0.02" , block decked 0.01" pistons came out of block deck 0.01" so i think i would of had like 13 or higher CR, i wanted mid to low 11 C.R. for 91 octane D.D. I had planned on using just the 0.06" H.G. but the top layer got damged during shipping, so i put together the two to get a bit lower C.R.

 

what block, crank, head and pistons are you using? So you're saying that your block was decked .010" (thou) and your head was milled .020" (thou)?

 

gsr block milled 0.010" (thos), gsr head milled 0.020" (thous), ls crank and rods, usdm itr pistons

 

wow....ya, you'll definitely need a thick head gasket to get your comp down to the range you want. .060" would be what you needed for thickness or swap those ITR pistons for USDM GSR pistons and use a stock 3 layer headgasket...you'd be right around 11.6:1 then....11.7:1 with just the 60 thou gasket (and your current setup).

 

yeah i got the gasket on, but now im having clutch or axle issues. I installed the rebuilt motor last night, let it run 20 mins, changed oil, was gonna break it in, put it in reverse, clutch felt firm, no grinds, put it in 1st clutch felt good, no grinds, put it in 2nd and the car's rpm just reved, but car didn't moved. I had to push my car back into the driveway. Car won't move at all now, in reverse or 1st. Goes into gear, rpms just rev, but car won't move.
But anyways, does anyone know the thicknesses of the top and bottom layers?

Modified by all-mtr-teg at 4:57 PM 9/17/2007


Modified by all-mtr-teg at 4:57 PM 9/17/2007

 

i have a questiong dont meen to jack ur thread just wana know how thick of a cometic head gasket do i need to bring my compretion from 13.1 to 12.5?

 

what kind of clutch are you using? did you get the flywheel resurfaced?

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Rony_typer &raquo;</TD></TR><TR><TD CLASS="quote">i have a questiong dont meen to jack ur thread just wana know how thick of a cometic head gasket do i need to bring my compretion from 13.1 to 12.5?</TD></TR></TABLE>

Are you at 13:1 with your head cc'd and a stock 3 layer headgasket?

 

running a new ACTION CLUTCH 1MS thanks to MOTU's tech write up. ACT streetlite flywheel, also new, new (rebuilt) axles.

 

did the clutch come with a spec sheet telling you what the step height should be on the flywheel for that clutch?

 

Are you at 13:1 with your head cc'd and a stock 3 layer headgasket?[/QUOTE]

yes

 

try using this

http://www.clubcivicquebec.com...f.php

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Rony_typer &raquo;</TD></TR><TR><TD CLASS="quote">

Are you at 13:1 with your head cc'd and a stock 3 layer headgasket?</TD></TR></TABLE>

yes [/QUOTE]


I'd say a .060" thou gasket should get you where you want to be.

 

no, no spec sheet, what do you reccomend?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by all-mtr-teg &raquo;</TD></TR><TR><TD CLASS="quote">no, no spec sheet, what do you reccomend?</TD></TR></TABLE>

Couldn't tell you. My Clutchmasters clutch came with a spec sheet that said what the step height on the flywheel should be for optimal clutch performance and engagement. Every manufacturer may have their own spec, you should try to contact the manufacturer of your clutch and see what they say.

 

Thanks, i'll hit up Alchemist for info.