cometic head gasket leaking excessive oil. Please help I need some advice

[1SlowCA18DET]

sorry for hijacking thread but codyace i tried to email you about the ac brackets cause i need 1 for my 92 sr swap please email at [email protected]

[david200095367]

ok i put it all back together and used silicone on the front cover and guess what it still leaks! So maybe it is the head gasket they are pos!

[fast_s13]

cometic=Trash

[david200095367]

just bought a damn apexi! i hope those are good. if not someone lmk before it gets shipped out today.

[fast_s13]

you should be alright with the apexi...if it still leakes afterword you have some problems

[david200095367]

well i looked and its leaking from the exact same spot again. so i think its just the cometic hg its garbage.

[homeslicej2]

.... so i think its just the cometic hg its garbage.

[tucker3113]

I have never sprayed my heads down with copper spray when doing a head gasket and never had a problem. Do alot of you spray down the heads with that stuff on your srs? Just wondering and the cometic gaskets that leak what are the flaws on them does anyone have a picture of one that was taken out that was leaking

[Hijacker]

Here's a pic I pulled from Eric Hsu automotive blog. It's of a test between a cometic (left) a stock mitsu multi layer metal (center) and a cosworth (right) for a 4G63. They torqued the headgaskets down with ARP head studs to 90 lb/ft. For this test, they took pressure film and it leaves an imprint on clamping load and distribution. The darker the impression, the better. As you can see, the cometic really doesn't seal as well as the stocker or the cosworth. In fact, Eric noted that the seal around the cylinders is backwards. It goes from a very light inside seal to a darker, better seal when it should be backwards (harder seal on the inside to a lighter seal on the outside)

Just some food for thought.

[david200095367]

thanks for the knowledge. i went with an apexi one so i hope this one will seal right. i was told its one of the best out there. hopefully the 3rd time is a charm.

[david200095367]

ok i found out why the cometic was leaking. Its the poor design/engineering of the gasket. see my new post.