gs-r block-b16 head?
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Joined: Aug 2002
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Originally posted by "speed_daemon1"
The actual combustion chamber in the b16 head is larger than the b18c by a couple cc's.
However the b16 head is supposed to flow the same as an ITR head, so it's a trade off of flow characteristics for compression. You can always shave the head or run a thinner head gasket to bring it back up.
Not too sure on a b18c head on a b16 block, haven't really heard of anyone doing that. Not saying it hasn't been done, just that I don't know anyone that's done it.
The actual combustion chamber in the b16 head is larger than the b18c by a couple cc's.
However the b16 head is supposed to flow the same as an ITR head, so it's a trade off of flow characteristics for compression. You can always shave the head or run a thinner head gasket to bring it back up.
Not too sure on a b18c head on a b16 block, haven't really heard of anyone doing that. Not saying it hasn't been done, just that I don't know anyone that's done it.
the ITR head happens to be cast from the same casting as the B16A head, so a little bit of port & polish work, and an ITR/CTR valvetrain, and a B16A head will flow as well as a B18C5 or B16B head.
compression ratio isnt JUST determined by combustion chamber cc's tho. engine stroke is a factor as well.
CR = (cc vol + cylinder displacement) / cc vol
the same head will have a higher compression ratio on a B18 block over a B16 block because of the added stroke (assuming you use the same pistons in both blocks, because piston dome/dish shape affects cc volume).
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Shawn
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The answer to your question is sqrt(pi)
Shawn
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The answer to your question is sqrt(pi)
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Joined: Aug 2002
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Originally posted by "`92CXhatch"
simple... b18c head will lower compression and b16a head raises... no matter what block the b16a head will be lower than a b18c... but this is good for turbo cars... like me i have a `97 GSR head that i want to trade for a B16... this would make the guy with the B16 have higher compression... this would also give me lower compression... so it is a win win if you find someone to trade like that...
-Keith
simple... b18c head will lower compression and b16a head raises... no matter what block the b16a head will be lower than a b18c... but this is good for turbo cars... like me i have a `97 GSR head that i want to trade for a B16... this would make the guy with the B16 have higher compression... this would also give me lower compression... so it is a win win if you find someone to trade like that...
-Keith
the B16A head flows better than the B18C1 head, so its dynamic compression ratio may be the same, or more than the B18C1 head on the same block.
dynamic compression ratio is the ONLY ratio that ultimately matters
__________________
Shawn
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The answer to your question is sqrt(pi)
Shawn
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The answer to your question is sqrt(pi)
