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Inlet Manifold Material


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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?

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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.

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