CharlesElliott Posted March 10, 2015 Share Posted March 10, 2015 My manifold on my race car has always leaked a little on the cylinders at each end where it joins the head - this is obvious from the soot marks on the gasket where it blows by the gasket sealing rings. I used to use OEM gaskets, and switched to aftermarket ones to see if it made any difference but it doesn't.Looking at the manifold, there is a chamfer that is probably a little too agressive and therefore failing to make a good seal.Apart from a new manifold, is there anything else I could do? Could I smear a little exhaust putty on the manifold to help seal it? Or is that a really bad idea? Link to comment Share on other sites More sharing options...
Area Representative Paul Richards Posted March 11, 2015 Area Representative Share Posted March 11, 2015 Silicon sealant will do the job. Link to comment Share on other sites More sharing options...
CharlesElliott Posted March 11, 2015 Author Share Posted March 11, 2015 Thanks Paul - I assumed it wouldn't be up to the temperatures involved? Link to comment Share on other sites More sharing options...
Nigel Riches Posted March 11, 2015 Share Posted March 11, 2015 First thing check if the manifold face is true, they do distort, if it's out of true there may be enough material to machine it back, check also at the cylinder head face, not so likely here as there is more metal heat and cool. Make sure the two faces are free from any foreign object debris which would preclude a flush fit, ie, old gasket material or sealant. Don't be over exuberant on the fasteners, and torque progressively to the figure for your engine. Regards, Nigel. Link to comment Share on other sites More sharing options...
Roger Ford Posted March 11, 2015 Share Posted March 11, 2015 Surely you have a spare manifold to try a different one? If not, I've got two of them. Link to comment Share on other sites More sharing options...
CharlesElliott Posted March 11, 2015 Author Share Posted March 11, 2015 I do have a spare one, but that might risk losing a few bhp Link to comment Share on other sites More sharing options...
Roger Ford Posted March 11, 2015 Share Posted March 11, 2015 Good point - it wouldn't have the fittings for the turbo.Maybe the leakage is what's giving you that ginormous horsepower. Link to comment Share on other sites More sharing options...
Mankee Posted March 11, 2015 Share Posted March 11, 2015 Sod the tuned exhaust; just introduce an air-leak!I'd get the manifold faced to start with. Link to comment Share on other sites More sharing options...
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