I could get my upper and lower intake manifold extrude hone. should i do it. they said it gain up to 40hp from the intake manifold. there doing extrude hone on turbos now, they said they got another 50hp from abel ibapra's car

 

40 Hp? I find that hard to believe. Can they prove it?

 

There is actually a reason you may not want to extrude hone the intake manifold.

If it is too smooth, gas may condense on the surface which can lead to an even more turbulent flow.

Extrude honing the turbos is a good idea.

However, for our cars the reality may be a gain of 5 HP from the turbos.

 

atilla is absolutely right.

 

True on the last 2.5" of the lower intake manifold and carbureted engines. There is a truth about too smooth a surface causing increased resistance, something about laminar airflow breaking up and spoiling the airflow. A semi-course surface creates small eddies like marbles for the air stream to ride on. I also wanted to throw out the word boundary layer just to use it. J

 

We just went over that stuff in class a few days ago.

What is extrude honing?

 

screw that

 

I'd consider putting that $410 toward a new manifold setup. That would be MUCH more benificial than a extrude hone job.

Stephen

 

$410, they lowered their price a good bit. I think it was about $600 a couple of years ago so I decided against it and think $410 is still too much for the benefit.

Jack

 

They could lower it another $200 and it would still be over priced! I'll take my chances with old fashioned porting and polishing thank you.

 

Forcing silly putty (basically) mixed with abrasive media through a part to remove material in places you can't reach with a grinder.

www.extrudehone.com

 

Groundzero motorsports made a LIM thats suppose to make more power, and be equal length...but no word on how much more power. CJ

 

It makes a noticeable difference on 20B manifolds. It would depend on your power level you are currently at if your still pretty stock, waste of money. If your full sinlge with a good tune, worth the money. Figure you spend how much on a cat back exhaust and get how much back in return? Pretty close to the same here.

 

I agree with the first part of your post, but comparing it to a catback doesnt make sense......catback lightens the car (vs stock), changes your exhaust tone, and is also a very visible mod, so you get many more benefits vs extrude honing.

To the thread starter: those hp figures are ridiculous for a street car, they had might as well quote you 500 hp. Maybe on Abel "Ibapra's" car, lol, but not on a street fd.

Btw, you can open up your UIM alot yourself. I ported and polished the exit, and totally opened up the entrance so it is a big smooth triangle instead of the stock three circular openings. Cost me nothing but time .

 

Here's a picture of the result of extrude honing

 

another pic

 

that looks extrude honed and coated on the outside with some hi-temp coating.

Tim

 

looks sand blasted to me. i have been looking into the extrudehone process as well. the only thing i wonder about is if they take in consideration the fact about fuel atomization thing. i cant tell from the picture, but it looks pretty damn smooth.

another thing is. . . if you are to extrudehone the manifolds, you need to look into doing the plates as well. . . or at least messing with them yourself. if you dont, then all that money went toward a bunch of nothing. once the air hits the iron plate it would act as a restrictor and all that added air flow just might be tossed out the window.

paul

 

That's a very interesting point.

Bridgestone's S-03 tread's sides are modeled after shark skin for better flow.