Hello all. I am an outside the box kinda thinker and was wondering if anyone has trid to make 6th port sleeves that had a helix in them to produce a swirling effect and if that would help anything powerwise. I am a cnc machinist, so trying as set would not be that hard, I just didn't know if it had been done before.
Thanks, Brian

 

brainwashed by the media?

If you want intake velocity, look at pineapple inserts. Granted your thinking is outside the box, I think the only thing you'll come up with is a design that restricts airflow.

Goodluck

 

I was thinking of something that included the ramp like the pineapple inserts and not a steep helix like a threaded hole, but something more gradual like only a couple of loops per inch...I know the throttle body spacer thing is a gimmick, but i thought that the sleeves might have a greater effect being so close to the rotor instead of all the way back at the throttle body. any other opinios out there?

 

I meant only a couple of loops over the whole length of the sleeve.

 

if you think about the path that the air will be taking, its just going to be like to seperate corkscrews if your using a helix design and thats just going to restrict airflow and cause turbulance. if anything i would maybe try rifling the sleeves into a pineapple ramps

 

It is worth experimenting with IMO, considering the sleeves can be tinkered with without having to modify anything else, you can always roll back to the original style with your old sleeves or by buying a used set.

Getting some swirl in the air/fuel mix on it's way into the chamber may not be a bad idea.

 

Yeah, I was trying to describe rifling the ports, but with higher ridges, like maybe .050 or .100 high .....I don't know. Just thinking out loud. It might work for swirl, but maybe not enough to make a measuable difference.

 

ya i dont think it would have any affect at all, but i would probly do it if i had the shop to. just to say i have rifled 5/6 ports

 

I have the equipment to do it, and I am sure my 6pi is not working(no air pump or actuators when I bought the car..s5 89 gxl) I am going to remove the sleeves as soon as I get the gaskets for the intake, as I don't want to go through the trouble/expense of finding an air pump and all associated parts,hoses, whatnot. I am going to replace all the vac hoses while i am at it, so I think I will have a little more top end than now with closed 6pi.

 

Anyone else got any input?

 

I personally think it would be a waste of time. The minimal (if there are even any) gains in HP would be less than just switching to a quality synthetic oil(approx 1-2 HP).

Top off the almost impossiblity of getting any sort of vortex effect in a less than 1 inch dia tube that is less than 3 inchs long, and any ribs, ridges, or helix are only going to be a hinderance at higher RPMs and negated at lower RPMs.

of course this is just my opinion... feel free to prove me wrong.

 

Honestly I have to agree that you are right about the short span and almost no effect. I guess that I should leave well enough alone and try something else.
THank you all for the opinions and advice. Back to the hollows of my TWISTED mind and pissin in the wind dreams of free horsepower.

 

You might get some mileage improvement, but it's not likely to gain you any power.

Intake tuning power gains come largely from shape, length & taper, and how they affect the standing wave resonance of the intake pulses.

 

Instead of doing the sleeves, what about the intake runners themselves? That would give you more than enough length to get the swirl going.

 

I would only be able to do it to the LIM because i only have access to 3 axis cnc mills and lathes, not the 5 axis machine it would take to work on the middle or upper intakes. I am not sure that the LIM would have that much more of an effect on swirl than just the sleeves. It might though....I truly have not looked at the LIM or sleeves in hand to get a good idea of length/benefit. I guess I should do that first.