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Old 03-21-2004, 07:15 PM   #1
White2.5GT
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Default Old head gaskets vs new 4 layer ones

Something has be bothering me for a while and I have to ask to see if there is any information out there about it. I know that Patrick Olsen has done a lot of research into head gaskets for the EJ25 phase I & phase II, so Patrick if your listening I would love to hear your input.

I'm wondering what the change in compression ratio of the engine is when switching the head gaskets from the old style that came say on my 1998 Legacy 2.5GT and the newer 4 layer ones I had installed after they old ones puked on me...I ask this because I have a feeling that the 4 layer one's might be thicker and thus lower the compression ratio of the engine....

PS: everyone is welcome to answer this not just Patrick Olsen.
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Old 03-22-2004, 05:18 PM   #2
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40 views and no response? ouch, I must have asked a mouth full...

ttt
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Old 03-22-2004, 07:25 PM   #3
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I don't think there is any difference in the thickness or CR.

I'm not totally 100% sure, so I didn't reply. If there is a difference, it's not something you're going to feel.

Go with the new 4 layer.

Jay Storm
www.sourcemotorsports.com
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Old 03-22-2004, 07:33 PM   #4
White2.5GT
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oh I have the new 4 layer...I've had them for about a year...they work fine...I was wondering if the stock 9.7:1 ratio changed at all....
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Old 03-23-2004, 04:22 AM   #5
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Dunno, never bothered to ask about the compressed thickness of the two gasket designs. It would stand to reason that the 4-layer would be thicker. On the other hand I vaguely recall that the center "core" of the original 3-layer gaskets was pretty damn thick, whereas the 4-layer seemed to have 4 relatively thin layers.

It's been a couple years since I held them in my hands, but that's what I'm vaguely recalling.

Pat Olsen
'97 Legacy 2.5GT sedan
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Old 03-23-2004, 08:51 AM   #6
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You have to CC everything out to get your CR. You will have to be happy with a guess . Don't feel alone,your not the only one.

Later, Tod
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Old 03-24-2004, 08:33 AM   #7
White2.5GT
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so the consensus is that the CR stayed the same?
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Old 03-24-2004, 09:31 AM   #8
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That or the change is negligible.
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Old 03-24-2004, 09:37 AM   #9
White2.5GT
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touche'

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Old 03-24-2004, 09:17 PM   #10
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I was thinking white2.5rs (alex) with my response above. And he's building the STI short block thing.Brainfart, sorry.

Anyways,I measured the MY98 head gaskets in the gasket kit I bought for my build and they 4 are layer. Three thin layers and one thicker one. They measured out at .058" around the cylinders and that was what the old style (three layer) was supposed to spec out at.
Hope that helps,
Tod
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Old 03-25-2004, 06:54 AM   #11
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Thanks todnar, that's what I have been looking for...
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