Bad manifold gaskets

These seem to be just a sort of a flare around the edge of the gasket? Really hard to tell from the photo. The early '28 models came with six individual copper gaskets that did have true rings built into them, but no one makes those.
 
Y-Blockhead said:
Has anyone tried the copper gaskets with the glands built in?MAC's seems to be the only vendor that carries them. https://www.macsautoparts.com/model...s-built-in-2-pieces-late-1931-28-24826-1.html
Click to expand...
These did not work for me. I could not even get these gaskets over the studs on the engine block.
I used the gland rings and the copper gaskets. I also put a light smear of hi temp exhaust sealant on the faces of the gasket.
Once the engine started and ran for a while, I also checked the torque and re-torqued if necessary.
 
alexiskai said:
I'm confused. The manifold is cast iron, so the linear thermal expansion coefficient is 5.8. The rings are mild steel, so the coefficient is ~6.5-7.0. That's close enough that the expansion you'd get at normal exhaust temperatures is like going from a slip fit to an interference fit. Unless you're needing to drive your homemade rings in with a hammer, it doesn't seem like you'd need to worry about buckling due to expansion.
Click to expand...

What about rings cut from 316SS tube (1.500" OD X 16GA (0.065"))? With a significantly higher coefficient than cast iron can they still be solid or is a gap needed for thermal expansion?
 
dmaxweb said:
What about rings cut from 316SS tube (1.500" OD X 16GA (0.065"))? With a significantly higher coefficient than cast iron can they still be solid or is a gap needed for thermal expansion?
Click to expand...

Would it be better to use solid rings made from mild steel or cutting 304 stainless steel rings with a hacksaw to allow some thermal expansion?
 
You must log in or register to reply here.
Back
Top