TRW pistons good enough?
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Joined: Mar 2007
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TRW pistons good enough?
I am wondering everyone seems to agree that for real power give my 390 10 or 10.5 to one CR then a good size cam to bleed off sme cylinder pressure. And have .012 deck height. But trwlz291f pistons won't even reach 10 to 1, I can't find a piston to meet all these criteria. These pistons plus my c8ae-h heads 71 cc will only be about 9.2 to 1.
Any ideas??
Any ideas??
Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
According to my calculations, those pistons (TRW-L2291) with 71cc chamber volume, .030" overbore, and Fel-Pro head gaskets, give you 9.6:1 compression. If you use .020" steel shim head gaskets, you get about 10.2:1.
Recheck your calculations.
Recheck your calculations.
Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
TRW L2291's have a 1.776" compression height.
Stock FE deck height = 10.17"
390 crank throw = 1.892"
390 rod length = 6.488"
Doing some simple math:
10.17-1.892-6.488-1.776=.014" deck clearance
When I put my 390 together with TRW L2291's, it had a deck clearance of .012". Close enough to the calculation.
Most Fel-Pro head gaskets have a compressed thickness of .041" and a diameter of 4.4". Look up the specs on your desired gaskets to get more accuracy there.
Now go here and plug in your numbers:
http://www.kb-silvolite.com/calc.php?action=comp
Stock FE deck height = 10.17"
390 crank throw = 1.892"
390 rod length = 6.488"
Doing some simple math:
10.17-1.892-6.488-1.776=.014" deck clearance
When I put my 390 together with TRW L2291's, it had a deck clearance of .012". Close enough to the calculation.
Most Fel-Pro head gaskets have a compressed thickness of .041" and a diameter of 4.4". Look up the specs on your desired gaskets to get more accuracy there.
Now go here and plug in your numbers:
http://www.kb-silvolite.com/calc.php?action=comp
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