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Old 02-04-2011, 06:30 PM   #1 (permalink)
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Default Somposite HG safe?

Hey guys I just swapped a a6 in place of my z6 (until I finish the build). Just wondering if a composite head gasket will be safe (don't want to tear into it if I don't have too). Will be getting dyno tuned. Stock internal so only shooting for maybe 200whp.
Thanks
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Old 02-04-2011, 06:36 PM   #2 (permalink)
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I'm not sure on that one. All I know is that they are a pain in the ass to get off/clean.
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Old 02-04-2011, 06:38 PM   #3 (permalink)
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I would say the chances of failure between the composite and a metal headgasket are greatly increased.

One reason I just found out recently Honda has made a 5 layer OEM metal replacement HG for the A6
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Old 02-04-2011, 06:48 PM   #4 (permalink)
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Even if I had a composite gasket sitting right there, and I needed a gasket ASAP... I'd pay what I had to for a metal gasket.
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Old 02-04-2011, 08:06 PM   #5 (permalink)
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well thanks for the responses guys. I guess I'll be looking into getting a mls HG for it since I'm not completely finished. Anybody know off hand what my CR would be with a y8 HG? Also I've got a brand new set of ARP's for my z6, they will work for the a6 also right?
Thanks again.
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Old 02-04-2011, 08:16 PM   #6 (permalink)
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There's a handy dandy compression calculator you can use. Google it.

Those headstuds will work fine.
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Old 02-04-2011, 08:19 PM   #7 (permalink)
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I tried google but most were about mini me swap's with y8 HG's (still looking). Thanks though

Edit: got it on zealautoworks 9.57:1

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Old 02-04-2011, 10:30 PM   #8 (permalink)
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Comp ratio would be 8.6 to 8.8 depending on how many layers the y8 headgasket has...assuming you have a stock z6 bottom end with a stock a6 head.

Or are you asking about using an a6 motor compared to a z6?
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Old 02-04-2011, 11:02 PM   #9 (permalink)
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A6 block and a6 head. y8 HG. I redid it on zeal works. 3 layer y8= 9.32 and 2 layer y8=9.57. But thanks man.

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Old 02-05-2011, 12:14 AM   #10 (permalink)
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as long as the headbolts dont stretch you wont have any issues with the graphite gasket but it will be a total bitch to clean up when you do change it.
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Old 02-05-2011, 07:55 AM   #11 (permalink)
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Oh I just realized you were asking if you should replace it, not what you should use.

Shit man, just run it as is. IF it goes, you should replace it with MLS. But I never blew my composite when I had my sohc zc (A6) up over 200whp/ft-lbs. They are a pain in the dick to clean off though.
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Old 02-05-2011, 09:44 AM   #12 (permalink)
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Originally Posted by Sentry View Post
Oh I just realized you were asking if you should replace it, not what you should use.

Shit man, just run it as is. IF it goes, you should replace it with MLS. But I never blew my composite when I had my sohc zc (A6) up over 200whp/ft-lbs. They are a pain in the dick to clean off though.
lol that's cool man. Yea I think I will let it go like it is. Hopefully I get my z6 built (or buy a built short block) pretty soon. income tax comes in friday
I'm still gonna run the a6 til It blows though lol
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Old 02-05-2011, 12:19 PM   #13 (permalink)
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Dont do it my neon had a composite HG on the 2.0 dohc I went through 3 HG before they gave me the newer MLS....
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Old 02-06-2011, 06:10 AM   #14 (permalink)
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You just said there is a Y8 HG in with that A6 head/block. I've not seen a composite Y8 HG, only metal.
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Old 02-06-2011, 07:44 AM   #15 (permalink)
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I have a $17.00 graphite and a $23.00 Taiwan mls but can't run either of those for boost from hearing the Taiwan copied mls hg's give you so much trouble. I've been through multiple knock off mls in the last two years but I had bad tunes.
I'm looking to order an oem $30.00 y8 mls from majestic honda soon and stick with those for performance use from now on.

It's good to see some perspective from Sentry. The bitch is if it blows during the tune you're out more money. But just think several peeps used to boost the untouched stock a6 back in the day.
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