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Old 02-15-2008, 11:24 PM   #1
bugeyes
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Default what head gasket options is there for a EJ257?

I've just pulled the heads off to find cylinders 3 and 4 have blown through to the water jacket and causing me to overflow my radiator reservoir bottle.
I also noticed I was starting to accumulate some soot residue on the underside of the rad cap.

The gaskets I had in there were cometic standard MLS type. Prior to installing them I had the heads and block all decked, ARP head studs torqued down to 85ft/lbs and I never overheated the engine.

One thing I didnt like about the gaskets is that they dont have any sort of seal between the layers of stainless steel at the edge that is exposed to the combustion pressures. I would have liked to see some sort of "rolled edge" that prevents the layers of the gasket from being directly exposed to combustion pressures.

On my current gaskets all the black viton rubber coating had been blown out leaving just the bare stainless steel. Cometic claim this viton coating is 1 thou thick. After this rubber blew out it effectively left a gap of about 4 thou!!!!!.

Apart from oem and cometic do we have any other options for a long life gasket (copper not being a long life option).
The cometic Fuzion type are out of the question as they only come in 50 thou thick, I need 30 thou.
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Old 02-16-2008, 12:46 PM   #2
CatfaceType-R
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why not oem??? don't fit your app?
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Old 02-16-2008, 03:28 PM   #3
Sinister redlines
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Many people have had issues with the cometics, most have relieved thier problems with just running stock STi gaskets. I am going to use the new cosworths they released at sema this year..
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Old 02-16-2008, 04:05 PM   #4
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Quote:
Originally Posted by Sinister redlines View Post
Many people have had issues with the cometics, most have relieved their problems with just running stock STi gaskets.

I like there gaskets and seals in the Harley market, but when rebuilding my EJ25 I was disappointed with the cometic head gaskets. I had an external coolant leak on #1 only when warming up if the ambient air temp was less then 30 degrees and would some times throw a #2 misfire code. Swapped them out for OE gaskets and bingo. No more coolant leak and the misfire code never showed up again. After looking at the cometic head gaskets you could see where the embossing was off, causing them to barley seal.
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Old 02-16-2008, 04:31 PM   #5
wrx2k4
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yeah +1 oem sti
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Old 02-16-2008, 04:34 PM   #6
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I have had no issues with Cometic's 0.070's.

If you only need 0.030's then just use a stock gasket.

Cosworth also have their own range of head gaskets now.
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Old 02-17-2008, 01:32 AM   #7
bugeyes
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Thanks for the cosworth tip.

I just checked out what they are offerring. It looks like a good product, I especially like the extra thickness around the bore area to give addtional seal.
They are also available in exactly the thickness I need.

Cosworth it is........................
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Old 02-17-2008, 01:33 PM   #8
Sinister redlines
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The only reason I am going with the cosies is that I am running 102mm bore on darton sleeves. The factory gaskets are just too small in the bore opening. The cosies are 101mm option and the right thickness I need and the 1mm difference when split between each side of the bore is nominal. 1mm= about .040" divided by 2 (for two sides of the bore)= .020" each side shouldnt make an issue..
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Old 02-17-2008, 07:19 PM   #9
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I was just getting ready to due an EJ257 swap and I was was planning on using the Cometic .040 to get the correct thickness for my JDM heads. I was under the impression that stock gaskets would either be too thick or too thin.

Does anyone know if there is an OEM gasket that is about 1mm thick, or .040"?
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Old 02-18-2008, 04:39 AM   #10
bugeyes
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Quote:
Originally Posted by WJM View Post
Use the stock STi gaskets, the stock head bolts with the factory TQ sequence and you will never have a problem.

Every cometic/ARP combo I've taken apart has seen results similar to what you describe.
I'd really like to see a true comparison between the clamping force of a new set of oem head bolts and a set of ARP studs.

I have sort of questioned the effectiveness of the arp studs as the shank on those is only around 10mm.
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Old 02-19-2008, 01:22 AM   #11
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Has anyone used the SCE Gaskets ICS Titan on their subaru motor yet???

Click Here
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Old 02-19-2008, 02:39 AM   #12
bugeyes
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SCE certainly seems to have some good products. I have emailed them to see what they have for the EJ25 engine series.
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Old 02-19-2008, 04:57 AM   #13
bjm
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Rocket Industries bring them in but Street Tuned are in the process of becoming agents
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Old 03-12-2008, 01:19 AM   #14
manxaru
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Quote:
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Rocket Industries bring them in but Street Tuned are in the process of becoming agents
loook good, but berry berry espensive!
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Old 03-12-2008, 04:12 AM   #15
bjm
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What sort of $$$ do they sting you over there???

Here in Aus they are less than cometic and not much different to genuine subaru
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Old 03-12-2008, 10:49 PM   #16
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The sce gskts are excellent-I spoke with sce and explained how the fire ring inside the gskt works even if the head starts to lift the split in the gasket around the bore where the wire is will keep the cylinder sealed.I used them when I built my sti and my friends(Andy Doran-1sti2h8).I tuned his car with a hydra to 642whp and 586 wtrq at 32psi on a dynapack here in cols.,ohio at slomotion motorsports.Just to let you know my name is john schroeck but most people just call me by my last name pronounced shrek-andy and i were the fastest subys at the eastcoast suby shootout 2 yrs ago and i won the unlimited class.At that time we were 2 of only a few stis running in the 10's then.also those gaskts are only sold in prs. at a little over $200.00
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Old 03-13-2008, 12:35 AM   #17
bjm
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I was quoted $188 a pair recently from a US store but got a quote of $135 a pair here in Aus. I'm talking about the S92494.

It's good to hear someone has had some success with them on Subaru motors already.
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Old 03-13-2008, 10:38 PM   #18
john 1badSTI
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Make sure your getting a price quote on the icstitans,they are the gskts youll want because they have the built in o-ring.
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Old 03-13-2008, 11:23 PM   #19
bjm
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Yah, check the part number I quoted
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Old 06-25-2008, 04:02 PM   #20
methaddict
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Quote:
Originally Posted by bjm View Post
Has anyone used the SCE Gaskets ICS Titan on their subaru motor yet???

Click Here
FYI, I just got done talking with the owner of SCE Gaskets. He says these gaskets are recommended for race use where a tear down is done often. The coating they use will not sustain the chemicals used in store bought coolant and will eventually break down the coating and cause coolant leak between cylinders.
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