what piston dish (cc) are you running on your boosted lt1 and whats your compression
01-19-2012, 07:43 PM
#1
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Join Date: Mar 2009
Posts: 125
what piston dish (cc) are you running on your boosted lt1 and whats your compression
Ok, I know the answer to this depends on your head cc size and what compression ratio you want.
However I want to know what you all are doing, in practice, on your fi 383 ands 396 boosted lt1s.
I still want to ask it because a dude I know is selling a forced induction 396 ltx w/ 22.5cc dished pistons and 75 cc heads.
Assuming my calculations are correct, I calculated that out and got a cr of 8.5:1 which would be too lazy.
However I want to know what you all are doing, in practice, on your fi 383 ands 396 boosted lt1s.
I still want to ask it because a dude I know is selling a forced induction 396 ltx w/ 22.5cc dished pistons and 75 cc heads.
Assuming my calculations are correct, I calculated that out and got a cr of 8.5:1 which would be too lazy.
01-20-2012, 06:42 PM
#2
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Join Date: Jul 2004
Location: MI
Posts: 1,174
Re: what piston dish (cc) are you running on your boosted lt1 and whats your compress
97 ss 383ci MM6
afr HEADS 195cc intake / 54cc chambers.
Felpro 1074 head gasket.
9.5:1 compression.
JE piston -28cc dish.
~14psi.
afr HEADS 195cc intake / 54cc chambers.
Felpro 1074 head gasket.
9.5:1 compression.
JE piston -28cc dish.
~14psi.
02-18-2012, 09:56 PM
#4
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Location: Upstate New York,USA
Posts: 1,791
Re: what piston dish (cc) are you running on your boosted lt1 and whats your compress
Sorry, just noticed you said 383/396.... I have a 355.
Original configuration:
Stock ported LT1 castings: 54cc chambers
Fel Pro 1074: .039 compressed height
Block not zero decked.
Diamond Turbo pistons w/-22 reverse dome
Calc'd CR was approx. 8.8:1
New TFS heads have 61cc chambers, same head gasket and pistons.
The nice thing is, I only run 93 octane pump gas yet I've been to 18 psi w/o knock/detonation/pre-ignition.
No meth, no water, no alcohol injection.
Original configuration:
Stock ported LT1 castings: 54cc chambers
Fel Pro 1074: .039 compressed height
Block not zero decked.
Diamond Turbo pistons w/-22 reverse dome
Calc'd CR was approx. 8.8:1
New TFS heads have 61cc chambers, same head gasket and pistons.
The nice thing is, I only run 93 octane pump gas yet I've been to 18 psi w/o knock/detonation/pre-ignition.
No meth, no water, no alcohol injection.
Last edited by DirtyDaveW; 02-18-2012 at 09:59 PM.
02-23-2012, 06:45 PM
#5
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Join Date: Jan 2005
Location: West Palm Beach, FL
Posts: 440
Re: what piston dish (cc) are you running on your boosted lt1 and whats your compress
~8.8 CR on my LT1 stroker. And it's very responsive. If your worried about a low CR, just run more boost. I really think there's more to it than just static CR. Eg. Consider timing, amount of boost, and the cam
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