compression question


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weetabixhead

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Apr 18, 2012
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Im soon going to be rebuilding my b16a2 as its gone abit smokey and want to freshen the engine up. I have the intention of also installing ek9 pistons and getting the head skimmed 10thousands or so. Question is what will be compression be as i cant figure out how to work it out. Will i also have any issues running big cams clearance wise etc with this setup?
 
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You have to be careful. First hone the cylinders and check the pistons rings gap for the type r pistons. For the comp. If you put your timing right and use 93 oct or higher you are fine. I was running my b18 ls-vtec with 13:5.1 comp at 93 pump gas and big cams. I make 243hp N/A... Why you shaving the head? The engine got over heating or something?
But one again... dont worry with the head shave to 10k and a OEM head gasket you shud be in the 11: pushing 12:1 comp.
 
I was advised to get it done as it helps to bump the compression up whilst still allowing the use of an oem headgasket. I need a cr of just above 12:1 in order to get the best results out of the cams i intend to use.
 
What cams are you planning on using? V2v and p2v clearances could be a problem if you don't measure them.
 
I think those pistons may have a negative deck clearance on the B16A, so the piston will protrude out of the bore slightly. Careful with that.

I don't think you need CR that high to run those cams do you? I know it's a different engine but they work well on H22s with stock bottom ends at 11:1
 
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Yeah from researching it ive found out that the piston protrudes 0.017 of an inch above the block... i assume this is an important issue that cant be ignored. I always assumed a cr of around 12:1 is needed for those cams to work best? Maybe im wrong
 
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