Contour Enthusiasts Group Archives Forums General Group Buy Extrude Hone - Interest check

Originally posted by livinsvt:

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So what does Demon's and SSmuchoo manifolds flow cfm wise? What do they flow stock? I guess I realy need some good comparisons to be in on this for sure. Thanks

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Read Dan Nixon's post.

Originally posted by ssmumich00:

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about upper 180's, close to 190cfm.

270cfm, if they CAN do that, would be an amazing boost given the relative choke hold the UIM is compared to the flow of the heads, etc. I wonder if they could do this process on a Triple EH UIM. . .Hmmmm,

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. I don't see how they can gain 100cfm just with a new process. Is this already tested on a svt manifold? I know you said one is being sent in. But in the other thread, a guy mentioned they have several laying around. I would think they could pull one off for test purposes. If its true I would be in for sure.

Originally posted by dallasb84:

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im just curious about something. 100 cfm is a whole lot. now i know this first hand it is very important to maintain a certain amount of velocity in the intake runners. bigger isnt neccesarily better. right? i mean thats why you see people with velocity stacks even when not using a manifold otherwise your fuel wont atomize and itll puddle. just like your not supposed to "polish" and smooth out your intake ports on your heads as well as even mess with em too much when porting and polishing. your just posed to port match the manifold to the head and rough up the head a little. im sure this wont hurt the svt if EH is involved but 100 cfm is a lot. i guess it wouldnt matter too much with boost but to really crank it open for people with na i think thats a little tricky.

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Ok first off were talking about intake manifold. In case you didn't know its a two piece setup. We are porting out the upper portion, just like svt did from the factory, but just a litte more. The injectors are located in the lower manifold, so no fuel is in the upper manifold and can still atomized properly in the combustion chamber were its suppose to. So widening the runners in the "upper manifold" will greatly improve air flow to the lower manifold were it may reach a restriction there. In effect it may add something like 2psi to the lower manifold, more pounds means more air, means more fuel equals more powa . The extrude hone process does leave a bit of a rough finish, so swirl will stil be present. I am just not sure were there getting the extra 100cfm over a triple honed manifold. Time will tell

Originally posted by vudusvt:

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I'm interested. Have you checked into the possibility of one price for "max" extrude honing, per Swazo in the other thread? About 1-2 months from now would be perfect. I can (and will, if necessary) go in on this sooner. However, we all know how short 1-2 months is for a CEG GB.

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