Heat shield, supercharger mounted above exhaust

[V8RX7]

I'm mounting an MP62 above my exhaust manifold.

The PO used a thick fibreglass blanket that touched both items.

There's only a 20mm gap between them.

Surely I'm better using a thinner sheild that doesn't touch either, or wrapping both in a thinner shield with an air gap between the two items.

[GreenV8S]

V8RX7 said:

wrapping both in a thinner shield with an air gap between the two items.

That seems like the best bet. I'm sure there will be movement between them, so I'd expect the exhaust to bash the fiberglass to bits pretty quickly. A heat shield strapped hard to it would have a much better chance. If you've got enough space to wrap a heat blanket around it that would be ideal. Second choice would be a thermal bandage, but plan to replace that every couple of years.

[tapkaJohnD]

I'd suggest as a large a sheet of aluminium as possible, mounted to so as not to touch either, allowing an air gap both sides.
It will absorb heat from the exhaust, but its high heat conduction and large area will mean that it will radiate that away and run much cooler than the exhaust, so much less radiated heat to the supercharger.
Keeping both sides clean and polished will inhibit both absorbtion and radiation, and a free flow of air across the gap will allow convection to carry away as much heat as possible. Any ICEngine runs at less than 40% efficiency, with the rest mostly lost as heat, to the exhaust and via the coolant radiator. Your supercharger heat shield would benefit from a separate cool air supply, not just underbonnet air.

John

Edited by tapkaJohnD on Sunday 4th November 12:32