hey i was wondering what you guys think of my porting job on my tpi.... i did this well over 2 years ago but i wanted to see what you guys think...... also did i screw up by siamesing the bottom of the slp runners does that help with anything....

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Runner entrances look good. How well do they line up with the plenum? Can't see the divided wall so no comment there.

Next time you open up the face of the plenum, take out a bit more metal so the air doesn't have to navigate through so much taper. I like to weld some behind both sides of the throttle body flange so I can keep it as straight as possible and have more room to cut. I also like to taper the far side of the throttle body opening and make sure the opening is slightly larger than the throttle body I use. I take and old gasket and dust the plum so I have a guide for cutting.

Definitely want to get into cartridge rolling after you cut with carbide bits.

I am one that is against siamesing tuned ports anywhere other than at the top of the runner. I do that sometimes to correct runner length (cast runners only). Siamesing further down the intake tract ruins the tuned effect and invites turbulence. If I had to consider that, I would change intakes altogether.

 

so you think i have messed up my tpi..... i was looking at the first tpi injection unit and it looked pretty good... i have the money for the first tpi... so i might go ahead and get that...

 

are they siamiesed all the way through

 

no they are not... they are siamesed at the top and bottom didnt get in the middle of the runners... but its not a problem anyways because im going with the first tpi injection unit.... so ill be selling my 48mm tb with airfoil, plenum, slp runners, edelbrock base, fuel rails with adjustable regulator, egr and cold start block off plate in june....

 

I dont necessarily think it's messed up but I do see room for improvement. I constantly try to do just that, so everytime I work another TPI intake I always ask myself how I can do a better job than the last time. Dont take what I say too harshly, I am a perfectionist and to do these things 100% you have to be almost.

I always sandblast, resurface factory baseplates and weld to reinforce the sealing surface (they warp easily when overheated), port match and size the runners all the way through with inside mics, weld where needed, reduce turbulence where possible, and use new good quality components so they are better than new. All bolt holes get chased and/or repaired, the intakes are all painted and cleared in the correct material, and gasket surfaces cleaned go gaskets seal properly. I've even made a few tools to make it easier to do things like take a crossbuff to the inside of runner tubes. When I assemble an engine, I like it to look modernized (new style components give more of the factory fresh look, IMO) and most of all, NEW.

I take lots of pride in my work and like to share my experience where I can. Lots of people dont understand how these intakes work which makes it very hard to modify them correctly. Lots of misinformation floating about out there. Even in a factory intake there's alot of torque left on the table if you know how to unlock it. It just takes time and patience

If I had a CNC machine I'd be all set! Just wish I had more space...

 

well im sure i will be much happier with the first injection tpi.. either way this setup should be alot better than my hack job.... so im going with a proven setup instead of my port job....