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Old 03-25-2009, 10:12 PM   #1
morrocco88
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Default Cometic Gasket... looks warped?

I just got my cometic .040" gaskets for my 2.1 stroker I bought from MPS and they look all warped and wondere if it is normal since this is the first cometic I've ever held in my hand.

Here are some pics:





They are obviously tight where they are riveted together, but they just seem all curved and oil can like, if that makes sense. the layers are all spread apart at the edges where they are not riveted. I just want to make sure I contact the seller if these are not right.

Anybody with cometic experience please let me know.

Thanks
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Old 03-25-2009, 11:35 PM   #2
Storm
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They may look like that now. When they are installed, everything lays down and matches up like they should.

No worries!
Jay
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Old 03-26-2009, 01:50 AM   #3
morrocco88
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I was thinking they would all lay down, but wanted to make sure. I just thought they should not be all arched like they are. It makes me feel a little better though. I read that some have a rubber like layer on the mating surface and that you should not use a copper spray, but these are all metal, so I think I will use the spray. What do you think?
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Old 03-26-2009, 07:33 AM   #4
Storm
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That black surface on each outer layer is a coating. Copper spray is not necessary, but proper head and deck surface prep IS NECESSARY. Get them to the 50 RA or whatever that little ticket in the wrapper says.

Jay
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Old 03-26-2009, 10:33 AM   #5
RealStreet
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This situation raises another question all together. If Subaru went to great lengths to engineer a gasket system that would seal under the "changes" heat/boost/misuse.... Why change it? For those of you that have done any research you will see changing trends in MLS gaskets. It is no coincidence that the 03-04 Cobra or the New Zr1 corvette have 4-5 layer MLS gaskets over just adding a thicker steel core. The block/heads/fasteners have to "hold" the gasket into place, it's a system... Even Cometic is moving into adding more thin layers over a single thick core. On some engines like the Honda platforms you go back in and re-torque after a heat cycle to get the gasket to work well because of the fastener yield that is lost in the first heat cycle.

So what is the winning combination on this platform? I know that stock head bolts/stock gaskets work well.. So do you move into a headstud/cometic gasket system to improve on that? I have stopped using Cometic gaskets on the Stock block small block Fords because between the thin deck and small fasteners the thick gasket doesn't work out well. But in contrast a aftermarket block with 1/2 studs the cometics work perfectly...

I am not saying as a whole that the cometic is a bad idea for the EJ. I have not used them because I have not run into HG issues on the EJ's I work on. Maybe some members with more experience in this app can add there experience?

Jay Meagher
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Old 03-26-2009, 11:18 AM   #6
mxpunk
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yes i must ask, why use cometic hg? arent the OEM ones good for enormous power numbers?
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Old 03-26-2009, 01:04 PM   #7
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Without diluting an otherwise informative thread, I will say that I have had OEM gaskets fail, but haven't had any failed Cometic gaskets. Maybe I'm lucky, unlucky, or just special.

Jay
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Old 03-26-2009, 03:02 PM   #8
mick_the_ginge
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My cometic's looked like that, they seem to work just fine.
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Old 03-26-2009, 04:41 PM   #9
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Quote:
Originally Posted by mxpunk View Post
yes i must ask, why use cometic hg? arent the OEM ones good for enormous power numbers?
people who have milled heads, custom pistons, or who desire a specific combustion chamber shape/size. The OEM won't always work for everyone.
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Old 03-26-2009, 04:47 PM   #10
morrocco88
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^^^ Thanks Mick, now I really feel better!

I went to a Cometic to get a .040" thickness as recommended by MPS. This was due to the amount of metal taken off when the deck was surfaced, and the heads were surfaced. So they are both finished with the proper RA.

Since these do not have the rubber/viton layer, I think I will use the copper spray. I think Mick has used the spray with good results.
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Old 03-26-2009, 04:51 PM   #11
mick_the_ginge
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FYI - I think all Cometic's have the viton layer: http://www.cometic.com/faq.aspx

Cometic does not recommend any additional glue as such. I don't do everything by the book. Works for me, may not work for others. Just putting that out their.
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Old 03-26-2009, 05:08 PM   #12
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Copper spray + Comectics, over 15K now and no issues...
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Old 03-26-2009, 09:41 PM   #13
morrocco88
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Quote:
Originally Posted by mick_the_ginge View Post
FYI - I think all Cometic's have the viton layer: http://www.cometic.com/faq.aspx

Cometic does not recommend any additional glue as such. I don't do everything by the book. Works for me, may not work for others. Just putting that out their.
I wonder if I got an older set then, because these are all steel with no viton layer. That's why I wanted to use the spray.
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Old 03-26-2009, 10:36 PM   #14
Storm
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See how the outer surfaces are black? That's the viton layer. If yours are bare metal, send them back.....but I can see the black in the pics.

Jay
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Old 03-27-2009, 12:58 AM   #15
morrocco88
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Trust me, there is no black on them, and there is no rubber or viton or anything. They are just steel. The part number is C4261-040. They should be fine right?
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Old 03-27-2009, 07:21 AM   #16
Storm
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Post another picture looking down on them please. They should have a black coating on the outer surface layers..... If they don't, the layers are either mixed up or something else. It's a relatively small operation at the factory.....I can't see how they could get out the door that way.

Additionally, if you can PM me....I can likely get you a set that is correct and turn those back in.

Jay Storm
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