Pelican Parts Forums - weber manifold coating

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Quote:

Originally Posted by piggdekk (Post 7343908)

I ended up having the manifolds (magnesium) bead blasted and powder coater in black. I followed your instructions and had them pre-heated prior to spray the powder on to avoid gassin up. Looks like it was a good idea since in few spots one can see some very small (less than half mm) "bubbles". Overall howerver the adesion looks to be excellent. We've used epoxy powder coat hoping for best resistance to fuel.

In the next picture you can see the tiny "bubbles" I was referring too. They show like white dots, but it is just an effect of the light.

Now I will have the 2 surfaces milled flat and I should be ready to put them back in.
Question: the interior and top and bottom surfaces won't be protected. I reckon they are not likely to get in touch with water, but still, should I protect them with some kind of penetrating oil? Finding gibbs penetrating oil in Spain is quite a challenge :).

thanks
luca

Save your search for Gibbs. It's not a permanent solution. If the engine works, that should be sufficient protection against the elements. If you still want to add some surface protection (under the gasket?), you could have had the manifolds anodized before powder coating or instead, ceramic coated the interior, even the exterior.

Sherwood

Thanks Sherwood,
all I need to do then is mill the surfaces and put them back on.
luca

Quote:

Originally Posted by piggdekk (Post 7343928)

Thanks Sherwood,
all I need to do then is mill the surfaces and put them back on.
luca

Yep. Don't forget to source insulation spacers (PMO) and another set of gaskets to sandwich the spacers. Another project would be to gasket-match the outlet of the manifolds to the intake ports of the head, especially if the heads have been upgraded. It's an incremental and optional procedure.

S

sure, I'll put the spacers in and match the gaskets. As for the spacers, isn't it a porsche part for those: 90110813100
Any reason why I should go for the PMO ones instead of the Porsche ones?

Quote:

Originally Posted by piggdekk (Post 7344755)

sure, I'll put the spacers in and match the gaskets. As for the spacers, isn't it a porsche part for those: 90110813100
Any reason why I should go for the PMO ones instead of the Porsche ones?

If they're made from insulating material, should be fine.

Sherwood

PMO has various sizes. So if your manifolds are a certain port size, PMO should be able to match them up. Unsure if Pelican's insulator is the size you need. Pelican is a PMO distributor so anything PMO sells, they can get.

Quote:

Originally Posted by KTL (Post 7344867)

Unless I'm mistaken or just forgotten, PMO insulators fit betw. carb and manifold. If so, only one size for a 40mm version (unless the thickness is variable). If they install between manifold and head, then there would be various IDs for the intake port dimension.

Sherwood

Insulators go between manifold and head. Here's a PMO retailer that lists the manifold gaskets and requests info on port sizing

Manifold Gaskets

Quote:

Originally Posted by KTL (Post 7344990)

Insulators go between manifold and head. Here's a PMO retailer that lists the manifold gaskets and requests info on port sizing

Manifold Gaskets

Kevin,
You're correct. However, insulators are different from gaskets. I had to dig into Google to find the page; it's not obvious in the link you posted. Here's the insulation page:

Heat Insulators

Sherwood

Yep. Sorry about that misleading link. I couldn't pinpoint the insulator location on the site. Found on the sidebar list they call them "Spacer Kit" but didn't think to check there until you found the link

I begin to understand why lots of people get scared by magnesium cases. I took the manifolds to the machine shop this morning to have them milled flat. This machine shop does a lot of old cars and has a farily good reputation, so they know what they do. The guy at the milling (or whatever is called) machine showed me that my manifolds were at least half a mm, if not more out of plane. Basically the area where the bolts enter is bent towards the heads, and the center is 1/2 or more mm higher. He said this is very common Porsche magnesium manifolds, and he often has to weld broken ones. I'm glad I had them properly milled, but if this much distorsion happens to the manifolds that are relatively cold and don't see much stress, what happens to the crankcases!!! Too bad I did not take a picture...
Anyway, I'll have them back tomorrow.
luca