AndrewMAshton Posted June 4, 2018 Report Share Posted June 4, 2018 Hello Again, tackling the next problem now, tracked my air leak down to the interface between inlet manifold and head, I used Racetorations 'high specification competition gasket' but it is not sealing, I am using standard 4A exhaust manifold and Bastuk Weber inlet manifolds, the only discrepancy is about 50 thou difference between the thickness of the two clamping points, will that affect the clamping? and can I use a gasket cement to assist, as always, many thanks for the help, cheers, Andrew Quote Link to post Share on other sites
stuart Posted June 4, 2018 Report Share Posted June 4, 2018 (edited) It wont help, I have the Triumph tune manifolds with an SAH copy exhaust and the discrepancy was considerably more so, I had the TT flanges milled down to suit, some of the manifold gaskets arent that clever either though I have had no problem with the TR Shop grey composite ones fitted with a smear of Copperslip. Stuart. Edited June 4, 2018 by stuart Quote Link to post Share on other sites
Ian Vincent Posted June 5, 2018 Report Share Posted June 5, 2018 (edited) I welded some small packers onto my Phoenix exhaust manifold to bring it up to the same thickness as the inlet one so that the clamps could grip them evenly. I also use copper spray on gasket sealant on the gaskets. Ill see if I can find a link. https://rover.ebay.co.uk/rover/0/0/99?loc=https%3A%2F%2Fwww.ebay.co.uk%2Fp%2F1016335549%3Fiid%3D231471126173 Rgds Ian Edited June 5, 2018 by Ian Vincent Quote Link to post Share on other sites
iain Posted June 5, 2018 Report Share Posted June 5, 2018 Have you checked that the manifold is not fouling on the block? A head that has been machined can result in the manifold hit the block and not allowing a seal...... Iain Quote Link to post Share on other sites
peejay4A Posted June 5, 2018 Report Share Posted June 5, 2018 +1. I have had the very same thing on a standard cast manifold. Quote Link to post Share on other sites
Drewmotty Posted June 6, 2018 Report Share Posted June 6, 2018 ....me too. Check that nothing is fouling. Quote Link to post Share on other sites
AndrewMAshton Posted June 6, 2018 Author Report Share Posted June 6, 2018 Hello, it looks like the forum has come up trumps again!! A close examination tonight has shown both inlet manifolds hard up against the exhaust manifold at the cylinder head, probably preventing an air tight seal, I will get the manifolds machined, there is plenty of meat to go at and report back, cheers, Andrew Quote Link to post Share on other sites
AndrewMAshton Posted June 10, 2018 Author Report Share Posted June 10, 2018 Hello again, all sorted after filing quite an amount off one of the inlet manifolds, the other only needed a little off, it has cured the air leak, some excellent advice from an old fashioned machinist near me, once bolted down make sure you can get a piece of paper between the two faces, and I can!! Thanks again, Andrew Quote Link to post Share on other sites
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