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O ringed head and copper gasket
Posted: Sun Mar 14, 2010 7:20 pm
by vr4gone
Well I took the head off my car because it was using water and I discovered that the head is O ringed, the gasket is solid copper and the engine is running 12 valve pistons. Can someone confirm my observations?
Are these pistons stronger than normal 8 valve pistons? What comp ratio would I have based on the dishes in the pistons? I know its low because it was gutless off boost.
I have a vrs kit coming but I'm guessing I cant use the head gasket because the head is o ringed. Can I just clean it all up and re install the copper head gasket and torque it down tighter?
Posted: Sun Mar 14, 2010 7:50 pm
by fugazi
Isnt that standard pistons, due to mirrorised valving?
Posted: Sun Mar 14, 2010 9:37 pm
by jk
I think copper head gaskets can be reused, but I once built a toyota twin cam turbo that had an o-ringed block, I used a factory head gasket and that seemed to work just fine. I never ran huge boost though so I have no idea if its suitable for big HP applications but I do use a very well respected engine guy for machinig and he never mentioned it being of any concern (he did the o-rings).
Posted: Mon Mar 15, 2010 4:28 pm
by Xentro
Those don't look like stock Mitsu pistons to me. Don't they all have a number in the middle?
Posted: Mon Mar 15, 2010 7:03 pm
by redzone
they look like forged copies of stock starion pistons to me... makes sense due to the copper/o-ring job.
get some wurth motor seal for the water galleries on the copper gasket..
Posted: Mon Mar 15, 2010 7:16 pm
by Komeuppance
We use stock head gaskets over here on oringed applications, because they are softer.
-Robert
Posted: Mon Mar 15, 2010 7:32 pm
by vr4gone
So what do factory pistons and factory DASH pistons look like? Do hey have a dish like these? Where can I get this wurth motor seal from?
Posted: Mon Mar 15, 2010 8:04 pm
by fugazi
vr4gone wrote:....Where can I get this wurth motor seal from?
Würth maby? :D
http://www.wurth.com.au/
More dealers on the website!
Posted: Mon Mar 15, 2010 8:45 pm
by vr4gone
What I meant was, what exactly is the name of the compound and can I pick it up locally? :D
Posted: Tue Mar 16, 2010 8:18 am
by redzone
i'll check my bottle today for a part number, you will need to find a wurth distributor!
stock head gaskets can be used with o-rings depending on the position of the o-rings.
Posted: Tue Mar 16, 2010 2:22 pm
by jk
my o-rings pressed into the metal fire rings on a standard gasket.
Posted: Sat Mar 20, 2010 4:24 pm
by sigmaproject
When I first had my 4g54 O ringed to accept the turbo the shop used a copper gasket and coppercoat.
First turn of the key and water leaked out everywhere.
Second rebuild he used a RTV silicone and a can of stop leak for good measure. That was 8 years ago and not a drop of water has been spilt since. :D