madteg
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| posted on 1/2/09 at 09:57 AM |
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Next V8 question
What is the difference between high and low compression is it the heads or pistons, i am thinking its the block as comp ratio is stamped on the block.
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Agriv8
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| posted on 1/2/09 at 10:39 AM |
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on the heads - the latest ones ( which are the same as the old ones but ) have had more skimmed of - deisigned to be used with the composite head
gasget ( thicker than the tin ones ) as mentioned dont worry about the last row of bolts.
There are lots of diferent pistion configurations that can give you a compresion ratio between 8.3 to 10.5. most common is arround 9.35 ish and 9.75
To get even more complicated you can start combining later heads but use a tin gasget (My Tip use well-seal if you do ) .
Got some good reading if you are going down the V8 rebuild route u2u you email and ill send it through ( when I can find it )
regards
Agriv8
Taller than your average Guy !
Management is like a tree of monkeys. - Those at the top look down and see a tree full of smiling faces. BUT Those at the bottom look up and see a
tree full of a*seholes .............
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DanP
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| posted on 1/2/09 at 10:55 AM |
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With the 3.5's and 3.9 it is the pistons that change the comp ratio.
Cheers
Dan
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