Compression Question

08-10-2005, 12:09 AM

I just compression check my JDM 7MGTE motor and got 150-160 psi for all 6 cylinders. My repair manual says that stock compression should be 142 psi per cylinder. I have stock internals and a Greddy 1.5mm head gasket and have not had the block of head milled. What could be causing such a high compression check, not that I'm complaining.

Poodles · 08-10-2005, 04:11 AM

Seems to be the norm for having a metal head gasket by what I've seen on these forums. As long as you don't detonate...

08-10-2005, 04:52 PM

What seems to be the norm, the metal head gasket or the high compression from having a metal head gasket. Every one that has a 7M know you need a metal head gasket.

Poodles · 08-12-2005, 02:59 AM

The increased pressure with a MHG SEEMS to be the norm. Did you have a valve job done or anything while the head was off? Valve can decrease the size of the combustion chamber bumping up compressions too

08-14-2005, 12:56 AM

No no valve job, stock internal motor.

suprra_girl · 08-15-2005, 10:27 AM

stock compression is 142psi or more

no more of a variance than 14psi per barrel

so as long as they're even

ya good

08-15-2005, 10:27 AM	#6
suprra_girl 7M POWAH! ;) Join Date: Jun 2004 Location: New Zealand Posts: 2,312	stock compression is 142psi or more no more of a variance than 14psi per barrel so as long as they're even ya good __________________ Please use the forum to ask your questions as they will get replied to much faster than pming me Pics of my build. "Good girls are just bad girls that don't get caught" Do a diagnostic first!

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08-10-2005, 12:09 AM	#1
Intenseneal Guest Posts: n/a	I just compression check my JDM 7MGTE motor and got 150-160 psi for all 6 cylinders. My repair manual says that stock compression should be 142 psi per cylinder. I have stock internals and a Greddy 1.5mm head gasket and have not had the block of head milled. What could be causing such a high compression check, not that I'm complaining.

08-10-2005, 04:11 AM	#2
Poodles 12psi boost Join Date: Jul 2005 Posts: 348	Seems to be the norm for having a metal head gasket by what I've seen on these forums. As long as you don't detonate...

08-10-2005, 04:52 PM	#3
Intnesneal Guest Posts: n/a	What seems to be the norm, the metal head gasket or the high compression from having a metal head gasket. Every one that has a 7M know you need a metal head gasket.

08-12-2005, 02:59 AM	#4
Poodles 12psi boost Join Date: Jul 2005 Posts: 348	The increased pressure with a MHG SEEMS to be the norm. Did you have a valve job done or anything while the head was off? Valve can decrease the size of the combustion chamber bumping up compressions too

08-14-2005, 12:56 AM	#5
Intenseneal Guest Posts: n/a	No no valve job, stock internal motor.