For $250 installed I can add a port and polished intake manifold for my Mini. The installer claims 8whp, has anyone done this and had good results or is this another Throttle Body loser mod?
Thanks

 

I've heard that it helps quite a bit. To me, if you've gone all out with mods like you have, you might as well, especially at that price. It will compliment the ported head nicely!

 

a tried and true mod. though rarely talked about here at nam. smoother is better afterall. but if you do that then you might as well take the IC horns off and polish those at the same time. I dont think it would be good for 8hp on your car, being that its hooked up already and might only see better throttle responce.

 

It seems $250 installed is too low a price for a quality port and polished intake manifold.

I've seen
http://store.webbmotorsports.com/ind...products_id=42
$540 for the parts (three) alone.
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Quote:
Our intake manifold is ported then Extrude Honed for the best possible flow.

We didn't stop there however! We also match the outlet from the intercooler to the intake manifold and Extrude Hone it as well as Extrude Honing the inlet to the intercooler. This gives the best possible intake path flow to maximize the potential energy of the intake charge.

This modification is highly recommended for on a car with a performance cylinder head, and yields an additional 6 horsepower.

This kit includes all three pieces of the aluminum intake path - the runner from the supercharger to the intercooler, the runner from the intercooler to the intake manifold, and the intake manifold.
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It's likely there are other mods that are more worthwhile for you.

+8 WHP? Show me the dyno sheet of the MINI with mods that had this benefit.

 

sounds like what I was talking about. if you are going to go and do a port and polish on the intake mani, then you might as well do the IC horns as well. that only makes sense, but is it worth it.........maybe, maybe not. but I know you like squeezing out any additional power you can so, hey! go for it man!

 

The overall volume and shape of the stock intake manifold is adequate. Forced induction forgives many intake path sins, but yes, some improvements can be made. The IM should be shaped by the head porter at the same time as the head; they are integral components. The exit port of the modified IM should be slightly smaller than the entrance of the intake port except at the injector trough which should match exactly; it is not advantages to hog out the IM and shaping should be done intelligently in concert with intake port geometries. A stock IM is better than poorly miss-matched high volume IM porting. I have a port matched intake manifold, because of stock core shift offsets, the after port match was visibly a better fit (using an IM gasket as a template), the before fitment had some edge overlap. The head’s intake port centerline was moved some so having the IM port moved with it avoided having a stepped edge. The before injector trough was off (that could be seen while the components were still on the vehicle), the after, spot on. The transition from the plenum to the runners was altered just a little bit and the runners became more port shaped. Depending on port geometries and how much material removal is performed from either component, the IM gasket may need port matching as well; mine needed reshaping.

It’s ok to remove casting flash and other surface irregularities within the IM & ducts but polishing has few benefits in forced induction. In some parts of the path it is better to have rough casting surfaces which cause a boundary layer of slight disruption in laminar flow which aids in heat transfer and increased velocity (through less resistance from surface adhesion) of the air flow above it. I hand polished the short side radius of both the supercharger output duct and the intercooler output ducts as a knee jerk hot rodding procedure but other than removing the casting blobs I doubt polishing made much of a difference. A few places where some hand porting and port matching can be performed for benefit is at the entrance to the supercharger intake duct, the entrance of the intercooler exit duct (there is a big square edge on the IED), and the exit from the intercooler exit duct/entrance to the intake manifold interface. Follow the “smaller exit enters larger entrance” rule for matching those transitions.

I’ve seen three different sets of intake manifolds and ducts and all had different casting features. It was if they were manufactured with different equipment and materials. There is no one size fits all (precisely) when it comes to the integration of these components.

 

not my thread ; but wow thx . i've heard that 100 grit on an intake is good to keep the fuel from seperating . so no super shiny polish job required .