Den83 Posted June 12, 2015 Share Posted June 12, 2015 Was thinking of making my own inlet manifold to mount my twin 40 webbers to my manta 1.8. Any factory made manifolds seem to be made from aluminium. I was thinking of making mine out of mild steel as its easier to weld and alot cheaper to buy. I know there is the fear of it rusting over time inside but maybe it could be coated to prevent this. Anyway i was wondering of anybody was ever come across or used a steel manifold before? Quote Link to comment Share on other sites More sharing options...
MicsManta Posted June 12, 2015 Share Posted June 12, 2015 what about stainless if you can't do ally. Quote Link to comment Share on other sites More sharing options...
davep Posted June 12, 2015 Share Posted June 12, 2015 Had a steel inlet manifold for twin SU carbs on a MG Midget back in the 70s, worked well with no rust problems. Quote Link to comment Share on other sites More sharing options...
robah Posted June 12, 2015 Share Posted June 12, 2015 If you can stop dissimilar metal corrosion by using gaskets and good quality cadmium coated bolts etc. that would be a good corrosion preventative. Quote Link to comment Share on other sites More sharing options...
guysat Posted June 12, 2015 Share Posted June 12, 2015 (edited) Have it Zinc plated after welding & machining, should stop the rust for a few years Edited June 12, 2015 by guysat Quote Link to comment Share on other sites More sharing options...
lamchop77 Posted June 14, 2015 Share Posted June 14, 2015 Or just paint with VHT paint or pot black manifold paint, both exhaust manifold, paint but should do the trick. Quote Link to comment Share on other sites More sharing options...
mantadoc Posted June 14, 2015 Share Posted June 14, 2015 The cylinder head inlet ports are iron.......... why worry about internal rust. Quote Link to comment Share on other sites More sharing options...
opel2000 Posted June 19, 2015 Share Posted June 19, 2015 Aluminium is only used as it is lightweight, easy and cheap to cast, but due to it's heat conductivity it is possibly one of the worst materials to use as an inlet manifold for carbs. Better material would be stainless followed by mild steel. Quote Link to comment Share on other sites More sharing options...
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