Contour Enthusiasts Group Archives Forums Modifications Duratec Performance Cutting down the LIM?

I just had an interesting thought - I wonder what gains there would be from machining the lower intake manifold to be shorter.

Shorter runners = a higher resonant frequency and should result in increased top-end at the expense of low-end. Could be an interesting mod for someone looking for those "last few horsepower"

Anyone have one on hand to see just how much material could be cut down?

I say cut it down a few mm's and put a phenolic spacer in there to cool down the UIM. There is room.

As for shortening both runners, I don't see any gains on the amount they can be shortened.

you cant shorten much can you because i know that the fuel rail is pretty high and my UIM touches already so if you shorten then your going to be in a world of hurt... am I right or wrong cause I am not sure but I think this is true