D.D.Anderson Posted April 13, 2014 Report Share Posted April 13, 2014 Well, today i got another question, after searching for an old post with this theme, i can't find any answers if the bore must match the gasket, I had no problems with this on motorcycles, but is there any different on cars? The A14 is 76-77mm bore i guess, but all i can find is gaskets with 79mm bores... Someone got time to discuss this? while prepairing for this i just came up with this "Bore match gasket" thought... Was lucky enough to accuire a 60000 low millage H89 head with water ports for manifold blocked off. Quote Link to comment
datzenmike Posted April 13, 2014 Report Share Posted April 13, 2014 They must not be smaller than the bore and protrude into the combustion chamber where the combustion gasses can get to them. It will heat them up and can cause pre ignition and it will erode away the thin metal 'fire rings'. As long as the metal rings are back from the bore edge and clamped between head and block they will stay cool. Quote Link to comment
D.D.Anderson Posted April 13, 2014 Author Report Share Posted April 13, 2014 yeah i know they must not go past edge, since in my view the piston could maby deform the gasket edge, but is 79mm bore gasket okay on 76-77mm? Quote Link to comment
datzenmike Posted April 13, 2014 Report Share Posted April 13, 2014 Well if it will seal the same block but with a larger bore, it should work fine with a smaller bore. Quote Link to comment
ggzilla Posted April 13, 2014 Report Share Posted April 13, 2014 Please tell me where you find 79mm bore gaskets, because Nismo and Tomei want a fortune for them. Nissan/Payen are smaller, as are Fel-Pro, Victor Reinz and other aftermarket gaskets. See RockAuto.com Quote Link to comment
D.D.Anderson Posted April 13, 2014 Author Report Share Posted April 13, 2014 Please tell me where you find 79mm bore gaskets, because Nismo and Tomei want a fortune for them. Nissan/Payen are smaller, as are Fel-Pro, Victor Reinz and other aftermarket gaskets. See RockAuto.com I often buy from Toshio Endo from B-Projects Japan, but it isn't cheap there either... I have asked many about this, some people are telling me that a bigger bore gasket gives same problem if too small bore or makes it leak faster... I can't find Stock head gaskets anywhere, and rock auto does not provide the diameter information. Quote Link to comment
ggzilla Posted April 13, 2014 Report Share Posted April 13, 2014 RockAuto sells stock replacement gaskets. They are all slightly bigger than the bore, probably 78 mm like the original Nissan gaskets. Quote Link to comment
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