I want to pull my intake off to replace the IMRC module that went bad and clean up the IMRC plates. I plan to port match the IMRC plates and cut back the transition ports on them. My question is, if I were to remove the runners form the intake and polish up the insides of them butter smooth, will this help me or hurt me? I know some turbulence is needed to help in fuel mixture and atomizaton, but I don't plan to rework the head as they will be staying on the car. Will the roughness in the cast of the head create enough turbulence for the atomization? Will polishing up the insides of the runners worth my while? I have done some research, but nobody has mentioned the polishing. It seems that shortening the runner length by 20-25% by about 2 inches will be very beneficial and won't hinder much lower rpm. It will expand rpms up into 6800rpms. Any help on the polishing would be great

 

I forgot to mention that roughness does help stop sludge, so will I be facing much of a problem there as well? I drive roughly 1500 miles per year on a good note.

 

Most of the fuel atomization comes from the injector squirting into the intake valves.I ported my imrc's when I removed the valves andit works great now. Please someone correct me if I am wrong but trimming the intake is more of a thing for when you haveaftermarket cams. Well I am very happy with my imrcdelete and definately feel a difference compared to when they were zip tied open. I actually gained 5mph in the quarter with the valves completely removed and the plates ported rather then stuck open.There is a noticeable drop in torquein town until I get going.youmight gain more from porting your IMRC's then a mild porting on yourintakeif your IMRC's are cast as poorly as mine were.There is a lip on the imrc plate so the valves make a tight seal and that is what I focused on as well as the corners on the primary/square port.

 

They are ziptied right now, but I was planning on changine out the module so I could keep them and port match the tops so the air flows over the lip a little better. I just don't wanna do things 2 or 3 times. I wasn't planning on hacking the intake all up like many do. I don't want to actually port the horns of the intake, but rather smooth the cast out so it's much smoother. I was thinking a wire brush on my dremel and a couple of 12packs later would get me where I needed to be....lol
If I went with the IMRC delete route, what kind of epoxy works best under those heat conditions. I don't want meltdown and would rather not weld them as the plates will get warped from the heat. Can I get epoxy from like Pepboys???

 

I used regular epoxy its already high temp and can handle lots of pressure. I also DID NOT fill the holes between the secondary and primary port. I did not fill them because the air goes together anyway and the epoxy kept falling out too easilly in those holes when heated up.Epoxy + pistons/valves=BAD lol.I recomend heating the plates up before you put the epoxy because aluminum expands alot under high temperatures. The intake polishing isnt very fun because they dont really want to come out lol. If you just cut out the lip that is under the butterfly valves in the secondary port and smooth out the IMRC plates youshould see results. Atleast I did like I said mine looked like they were cast in a high school shop class lol.

 

Nice. Thanks for the info