geordi wrote:
I wasn't specifically aware that modifying the gasket and putting the copper wire in there was a 'fire ring', I had thought it was like you described... BUT either would be an OK solution by me if it was possible.
Maybe the head gasket can be trimmed back around the cylinders and the copper wire can be used instead? That was the basic thought I had, but I don't have the engine building experience to know if it would survive the heat / pounding / pressure in that environment. That was where I thought about just wiping some sealer into the leaves and calling it done.
Unless someone knows how to have a better head gasket manufactured, maybe out of something single-layer?
Geordi, it may have been me you were referring to before when you were talking about someone spraying a coating on their gasket? If so, I was not planning on doing it between layers. To me, between layers is likely not where the problem is; the Hylomar I'm going to use is principally to help fill in imperfections in the surfacing of the head and the block. Hopefully the clamping force and the viton will be sufficient to keep leaks from between the layers.
The engine builder I was talking to seemed to think that the coolant weeping he had to deal with with MLS gaskets had to do with the machining imperfections on those outside surfaces, not the layers.
As for fire rings or O-rings, I will say that my MLS gasket seemed to work fine for 130k miles or so, and even then it appears that my leak was caused by the crack in the head, not a leak in the gasket. it
may be that a gasket leak caused some hydrolocking that caused a crack, but it's hard to tell because of the condition of the gasket. Should a gasket last more than 130k? Absolutely. Can it be considered a pretty good seal given the apparent lack of torque my head bolts were under (see my specs on the "need your data" sticky thread)? To me, yes. So perhaps idealistically, I'm hopeful that a good gasket, properly torqued with ARP studs and coated with Hylomar for the surface imperfections will be good enough.