help with compression calculation
Thread Starter
Joined: Jan 2005
Posts: 15,713
Likes: 7
From: Humble Texas
help with compression calculation STOCK bottom end LQ9 6.0 (4" bore)
64cc heads
.040 compressed gasket
4.03 gasket bore
piston stroke 3.622
piston deck clearance ??????? i guess .005 above deck????
what am i looking at compression wise? 11.3-11.5ish? thanks gurus. i couldnt find ANYTHING about the piston deck clearance. someone educate me please
64cc heads
.040 compressed gasket
4.03 gasket bore
piston stroke 3.622
piston deck clearance ??????? i guess .005 above deck????
what am i looking at compression wise? 11.3-11.5ish? thanks gurus. i couldnt find ANYTHING about the piston deck clearance. someone educate me please
STOCK bottom end LQ9 6.0 (4" bore)
64cc heads
.040 compressed gasket
4.03 gasket bore
piston stroke 3.622
piston deck clearance ??????? i guess .005 above deck????
what am i looking at compression wise? 11.3-11.5ish? thanks gurus. i couldnt find ANYTHING about the piston deck clearance. someone educate me please
64cc heads
.040 compressed gasket
4.03 gasket bore
piston stroke 3.622
piston deck clearance ??????? i guess .005 above deck????
what am i looking at compression wise? 11.3-11.5ish? thanks gurus. i couldnt find ANYTHING about the piston deck clearance. someone educate me please
4" bore x 3.622" stroke
factory 317 head is 71.06 cc
Deck is .005" out of the hole
piston volume is 0cc
I think the factory head gaskets are .060"
If it is a stock LQ9 and all you did was swap on some 64 CC heads, you are probably 10.9:1 ish with a stock gasket and a hair under 11.5:1 with a .040" gasket.
I use this handy dandy tool:
http://www.rbracing-rsr.com/compstaticcalc.html
Thread Starter
Joined: Jan 2005
Posts: 15,713
Likes: 7
From: Humble Texas
What I have read about the LQ9 says:
4" bore x 3.622" stroke
factory 317 head is 71.06 cc
Deck is .005" out of the hole
piston volume is 0cc
I think the factory head gaskets are .060"
If it is a stock LQ9 and all you did was swap on some 64 CC heads, you are probably 10.9:1 ish with a stock gasket and a hair under 11.5:1 with a .040" gasket.
I use this handy dandy tool:
http://www.rbracing-rsr.com/compstaticcalc.html
4" bore x 3.622" stroke
factory 317 head is 71.06 cc
Deck is .005" out of the hole
piston volume is 0cc
I think the factory head gaskets are .060"
If it is a stock LQ9 and all you did was swap on some 64 CC heads, you are probably 10.9:1 ish with a stock gasket and a hair under 11.5:1 with a .040" gasket.
I use this handy dandy tool:
http://www.rbracing-rsr.com/compstaticcalc.html
