rb2.5 intake manlfold

[rbzedx]

what do you think[IMG]http://i154.photobucket.com/albums/s276 ... an1447.jpg[/IMG]

[rbzedx]

almost done

[240z4u]

Most intake manifold design theory says that you want those horns a bit off of the wall of the intake, drawing air more from the center. Not sure if you can just slide them in a bit. Just a suggestion.

Looks great man! Love it.

Evan

[Sil240]

Yeah looks good. 240Z is right (from what I've read)

Check out Ken or Kory Bell's book.It has Intake manifold design.Also if you go to the book store there is a ECU book made by motorbooks that has some info too.Cant remember the names of the books though.

[Carl H]

looks very much like a RIPS style intake.good job.

[l0nestar]

Looks promising.I'm not sure about the 180* bend on the velocity stacks though - used to seeing more like a 45* funnel. But the 180* may be more efficient. I really do not know! What would you charge for a piece like that?

I have Corky Bell's book, I can scan the pages and send them to you if you would like. Or I can grab the ISBN and you can buy it for ..$23 from Barnes & Noble or Amazon. It has a lot of good theory.Maximum Boost - Corky Bell [Amazon Link]

Do you use a stock IM as the base and tig to it, or make your own flange?

Sil240,Is this the book you are talking about?How to Modify Management Systems: Motorbooks Workshop [Amazon.com] It has a Focus ZX3 on the cover.
Modified by l0nestar at 3:03 PM 10/16/2008

[Sil240]

Yup exactly.Those are the 2 books I was talking about.I have a crappy memory.

[Mistaken]

Nice design, but one flaw i see is your lead in near the first cylinder. It is most likely going to overfeed cylinders 4-6 and have a pocket of stagnent air from 1-3. I have some pretty decent computer modeling and flowtesting programs at my disposal, so ive done some extensive concept testing before i actually build one and flow test it.

Other than that though looks like a nice starting point for what can become a very nice manifold with proper testing and design changes.

[240z4u]

Nice design, but one flaw i see is your lead in near the first cylinder. It is most likely going to overfeed cylinders 4-6 and have a pocket of stagnent air from 1-3. I have some pretty decent computer modeling and flowtesting programs at my disposal, so ive done some extensive concept testing before i actually build one and flow test it.

Other than that though looks like a nice starting point for what can become a very nice manifold with proper testing and design changes.

I honestly feel that moving to a forward facing manifold on an inline motor is a compromise anyway. I was never convinced the greddy manifold was that great, I have never seen flow numbers.

Would be awesome if you would put up some sort of plenum design for us that your modeling says would work well.

Evan

[meet07]

who is that big head dude behind the manifold....lol

[imotion s14]

who is that big head dude behind the manifold....lol

Count Dracula?

[USMCgetsome]

THE COUNT! 1,AHHH HHAA HAA, 2 AHHH HAA HAA..... lol. . Keep up the good work. The manifolds when done are hella expensive!

[rbzedx]

this is what was on the car made it a little while ago both are copies of what i have seen being used

[BoostFab]

looks nice!! just like the RIPS thumbs up!!!! it's a lot better than those ebay JUN Knoc-koffs

[Kalypso]

I have some pretty decent computer modeling and flowtesting programs at my disposal, so ive done some extensive concept testing before i actually build one and flow test it.

that knowledge is in high demand.

you should make a new thread. and call it "the definitive intake manifold design thread."

include equations and diagrams.

it will be stickied and we will all rejoice.

[Mistaken]

I'm getting close to a finished design, and as soon as i finish it up I will be more than happy to share my findings with everyone.

His design could be improved quite a bit if he changes the bottom of the inlet. Right now it just makes a ninety into the plenum, but if he makes it a larger radius and less vertical it will help quite a bit.

This is the current state of the design, for those that are interested. I still have a decent amount of work to do, but this is the basic shape more or less.

Note that the colors display the different velocities. This plenum is designed to use internal velocity stacks and have a volume ~3L. This is just a basic graph to quickly test the shape of the plenum for any major flaws.

[Kalypso]

woah!!

so ideally, the flange for the throttle body, should point perpendicularly to the center of the plenum,

so that air can enter and have opportunity to bend toward either the first or the 6th cylinder.