Gareth J
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The inlet manifold on the old vw beetle were heated by exhaust gas passing through a pipe alongside it. The two steel pipes were cast together with something conductive. Probably aluminium or zinc.
I'm guessing that this suggestion isn't that helpful though as it would be easier to just make a water jacket as was mentioned earlier.
I'm guessing that this suggestion isn't that helpful though as it would be easier to just make a water jacket as was mentioned earlier.