O-ring specs?

kleann

kleann

VP44 pwr
Joined
Aug 23, 2008
Messages
4,388
Never had o-rings done, but want to try them out. I searched but didn't see any specs. Thanks
 
Brad did a .041 wire in mine with .010 protrusion. dead center of the fire ring on the gasket.
 
Just read somewhere Brad said .007-.008 on a street engine, which this will be. I remember at one time there was a big thread about this, can't find it though.
 
.010-.012 is normal these days, I have one at .018.....9 years old and another at .014.....4 years old. Brad is a smart cookie, take his advise!

Jim
 
bsmith said:
Didn't mean it like that jim. Just what I had in my notes for future reference.
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NP bud, I think most people use .041 wire, Piers used .051 on my head and I just stayed with it. When Randy my local cyl head guy did the one in my avatar he set it at .014, big protrusion takes a bit more time to get it all set when torquing the head down.

Jim
 
Jim Fulmer said:
.010-.012 is normal these days, I have one at .018.....9 years old and another at .014.....4 years old. Brad is a smart cookie, take his advise!

Jim
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Cool, Think I will get .010 with .041 wire like dezelfrek said then!
 
0.041" stainless wire, groove 0.029" deep 0.039" wide 120mm bore center.
 
Here is one I just finished this morning. .041 wire cut .030 deep
 

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I ended up going with 2

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^^ X2 ^^

if you just have the head off, i understand why you cut the o ring in the head. on the other hand, if your doing a complete rebuild, wouldnt it make more sense to o ring the block?

if you already have your block set up in the boring bar, it would be just one more minor step to cut the o ring in the block, then if you ever wanted to use a different head in the future there is no need to have it o ringed.

whats the benefit to a double o ring?
 
otisd85 said:
^^ X2 ^^

if you just have the head off, i understand why you cut the o ring in the head. on the other hand, if your doing a complete rebuild, wouldnt it make more sense to o ring the block?

if you already have your block set up in the boring bar, it would be just one more minor step to cut the o ring in the block, then if you ever wanted to use a different head in the future there is no need to have it o ringed.

whats the benefit to a double o ring?[/QUOTE]


I'm not positive there is any. But when I blew my gasket, I was running 90psi+ and a single ring is no guarantee at that level. Some of the local pulling tractors are running 2 O-rings at some insane boost levels, so I thought that I would give it a shot.

Since then I've made some changes to get the boost down, so maybe it was overkill. I just know that I really don't want to pull the head again. One thing though, it took a while to get them seated. I torqued it 5 times before the nuts stopped moving.
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