Double check my comp ratio math?
Thread Starter
Burning Brakes
Joined: Sep 2009
Posts: 1,239
Likes: 2
From: Naples FL
St. Jude Donor '12
Double check my comp ratio math?
I have a set of dart heads for my LS6 with 58cc comb chambers. I was told that was a 11.6 CR but by my math with a .051 head gasket I come up with 11.25 CR which I feel better about. I used a deck clearance of .006 and a 0 piston dish/dome.
I know my math must be off some as I figured the stock CR at 10.42 when advertised is 10.5
Can someone help me out with this plz?
I know my math must be off some as I figured the stock CR at 10.42 when advertised is 10.5
Can someone help me out with this plz?
Thread Starter
Burning Brakes
Joined: Sep 2009
Posts: 1,239
Likes: 2
From: Naples FL
St. Jude Donor '12
Melting Slicks
Joined: Jun 2012
Posts: 3,163
Likes: 6
From: Oceanside California
Thread Starter
Burning Brakes
Joined: Sep 2009
Posts: 1,239
Likes: 2
From: Naples FL
St. Jude Donor '12
I need to verify this, but I think I found the discrepancy. I put in a .006 deck clearance, but I think the piston actually goes above the deck so deck clearance should be -.006 I even read -.008 somewhere under full rpm load.
Anyone else care to comment on this?
Melting Slicks
Joined: Jun 2012
Posts: 3,163
Likes: 6
From: Oceanside California
I used the 898 and 622 numbers, I actually also got 11.24:1
I need to verify this, but I think I found the discrepancy. I put in a .006 deck clearance, but I think the piston actually goes above the deck so deck clearance should be -.006 I even read -.008 somewhere under full rpm load.
Anyone else care to comment on this?
I need to verify this, but I think I found the discrepancy. I put in a .006 deck clearance, but I think the piston actually goes above the deck so deck clearance should be -.006 I even read -.008 somewhere under full rpm load.
Anyone else care to comment on this?
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Melting Slicks
Joined: Jun 2012
Posts: 3,163
Likes: 6
From: Oceanside California
All the little differences and changes can give you anywhere from 10:1 maybe up to 10.6... It depends on the numbers used in the calculations. Its hard to know for sure what is in the engine without actually using a micrometer and dial indicator on every part.
The figures we use are the generally accepted ones from forums etc. Most people would calculate with a 3.898 boar, a 3.622 stoke, a .052 gasket thickness, and a -.006 DC. But they are not necessarily the exact specs in every LS1.
Last edited by NukeC5; Sep 5, 2012 at 11:42 PM.
