Piker Porting (Intake Manifolds)

12many said

The thread was created in hopes that others would post about whatever intake they have/had and what they did to it, tools they used etc. Very scant sharing, likely widespread reluctance to. RB gave me some useful insight and opinions that has me looking into some other areas I wasn’t considering (was going 40 grit finish, now looking into the texture) but anything more from me is limited as I don’t have a flow bench so that leaves me out of any further continuing discussion. :)

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Here’s an interesting thing. Every time I tried a burr finish it lost flow on my bench. Drove me nuts. Finally I decided way too many smart guys were saying burr finish, burr finish, burr finish. So I had to swallow my pride and figure out how to do it. Now I don’t finish any other way.

Sometimes a flow bench can tell you bad information. Another example of that is on the exhaust port. The bench will tell you to make the port bigger and bigger and it rewards you with a nice, big flow number. The problem is that big port just killed a ton of power. The bench wants a big exhaust port. The engines wants a small, fast and quiet exhaust port.

Even the EFI guys are using a burr finish from the valve seat to 3 inches above the injector. Reversion is real and the burr finish above the injector helps reclaim (for lack of a better term) some of the fuel that gets blown back up the runner by reversion.