Tombola Posted April 28, 2020 Posted April 28, 2020 I have a couple questions copper head gaskets for those who have them/use them. Thickness. copper sheet I can find is either .9 or .7mm thick, standard gasket is .8mm the difference is half a cc either way. Further information, engine is a 89 GSX1100F engine, I'm fitting hayabusa pistons and having the bores out to 81mm. O-ring the head. how much does this usually cost? Quote
Blower1 Posted April 28, 2020 Posted April 28, 2020 Get MLS gasket. No need to play with piano wires, different sealers with copper gasket and no oil leaks. Copper head gaskets tends to leak oil even whatever sealers are used. 2 Quote
Jaydee Posted April 28, 2020 Posted April 28, 2020 I've always used mls gaskets without any problems. But this time around I'm going with a copper one as I have an 1186 piano wired block with Cosworth pistons. 1 Quote
Gixer1460 Posted April 28, 2020 Posted April 28, 2020 Hopefully not in those bores LOL! Good boy - another fellow Cosworth piston user! Quote
Jaydee Posted April 28, 2020 Posted April 28, 2020 1 hour ago, Gixer1460 said: Hopefully not in those bores LOL! Good boy - another fellow Cosworth piston user! Everything needs a good clean. Bores are in great nick, just look shite in the pic. They'll be getting a good glaze bust along with a fresh of rings. Quote
Reinhoud Posted April 29, 2020 Posted April 29, 2020 (edited) 21 hours ago, Tombola said: I have a couple questions copper head gaskets for those who have them/use them. Thickness. copper sheet I can find is either .9 or .7mm thick, standard gasket is .8mm the difference is half a cc either way. Further information, engine is a 89 GSX1100F engine, I'm fitting hayabusa pistons and having the bores out to 81mm. O-ring the head. how much does this usually cost? Don't use copper gaskets, use OEM, MLS or fibre from Cometic. Fibre from Cometic can handle 17psi boost. Copper gaskets are very hard to get them free of leaks, I couldn't get it right.. Edited April 29, 2020 by Reinhoud Quote
Gixer1460 Posted April 29, 2020 Posted April 29, 2020 1 hour ago, Reinhoud said: Don't use copper gaskets, use OEM, MLS or fibre from Cometic. Fibre from Cometic can handle 17psi boost. Copper gaskets are very hard to get them free of leaks, I couldn't get it right.. Just cos they haven't worked out for you doesn't mean they are bad - i've used them with nitrous and turbo to well over 2 bar boost - what does that prove? They are a re-usable gasket that needs careful use - just like building any engine. Quote
wombat258 Posted April 29, 2020 Posted April 29, 2020 I use copper head gaskets on a water-cooled 1300cc circuit race engine with no problems. O-ringed block, flame annealed copper, and copper coat sealer. Quote
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