On ARP, yup all head stuff is 1/2 inch studs and bottom is as well
(maybe 7/16 on mains). All torqued to spec.
mayf
Rick Byrnes wrote:
> John started this, so lets talk about "O" rings.
>
> In the 80's I used a metallic O ring to seal combustion. This
> requires a counterbore in the cylinder so the ring is supported all
> around, and can be squeezed about 20 %. The hollow 1/6" dia tube O
> rings were filled with "I think argon", but the manufacturers will not
> disclose, nor will they talk about their manufacturing process. This
> is near perfect sealing of combustion gasses unless the cylinder head
> lifts because of cylinder pressures exceeding clamping load.
> You guys know all about that stuff, because we all buy ARP studs and
> nuts. Right Doc? :=d
>
> The elastomer o rings also need to be squeezed about 20% and really
> need to be contained in a counterbore or groove which is what I did so
> there was no head gasket per se. I suppose that if you used a copper
> head gasket that was the proper thickness and created openings that
> provide support for the o rings it may actually work, however you
> still need to meter the water transfer from block to head. (or head to
> block)
> Ready made gaskets have done that for you.
> Cometic has such a gasket now that uses the metallic O rings with the
> remainder of the gasket being their conventional MLS. The same
> surface finish requirements would be important. The metallic o ring
> supplier is Helicoflex. They have been in the business for years, and
> I began working with them in the mid 80's. (introduced them to the
> automotive business).
>
> More in another note. I can't remember what size is max and don't
> have the patience to write too many, but want to do this now.
>
> Rick
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