intake manifold beginning

[thespeedfactory]

[HellRot Roundel]

interesting. more info?

[JordanMD88]

Looks like a Skyline Intake manifold. Off of a RB26?

interesting

[HellRot Roundel]

I wouldn't know. My 240 only has the measly RB20. haha

[bennyfizzle]

sum long ass runnerz.

[DTRguy]

ITB's!

[YellowBed]

any hp goals?

[thespeedfactory]

The plenum is from a RB26. I will have nearly 10" of runners at 2.25 ID. Should make some descent adds to the torque numbers. Willalso be running a 90mm Q45 TB.

Total cost all done will be about $580 including powdercoating.

Should be pushing 2 bar again by Nov 15 with new O-ringed block (maybe, but I have the tools and materials in case) and SCE copper gasket with compression rings.

My nitrous will be here by the end of the month for a 100 shot down low in the RPM's until the HX55 spools and my meth up top to keep the temps down.

[Hova]

Originally Posted by thespeedfactory

The plenum is from a RB26. I will have nearly 10" of runners at 2.25 ID. Should make some descent adds to the torque numbers. Willalso be running a 90mm Q45 TB.

Total cost all done will be about $580 including powdercoating.

Should be pushing 2 bar again by Nov 15 with new O-ringed block (maybe, but I have the tools and materials in case) and SCE copper gasket with compression rings.

My nitrous will be here by the end of the month for a 100 shot down low in the RPM's until the HX55 spools and my meth up top to keep the temps down.

when i read stuff like this, it seriously makes me


You guys take this stuff so lightly lol. This type of work blows my mind away.

BEST of luck man! really cant wait to see more progress!! and those HK55`s are HUGE!!! should be some insane power out of that tractor motor

[xatlas0]

Originally Posted by thespeedfactory

The plenum is from a RB26. I will have nearly 10" of runners at 2.25 ID. Should make some descent adds to the torque numbers. Willalso be running a 90mm Q45 TB.

Total cost all done will be about $580 including powdercoating.

Should be pushing 2 bar again by Nov 15 with new O-ringed block (maybe, but I have the tools and materials in case) and SCE copper gasket with compression rings.

My nitrous will be here by the end of the month for a 100 shot down low in the RPM's until the HX55 spools and my meth up top to keep the temps down.

I mean no disrespect, but long intake runners may not be the best intake system for a high-boost application. The primary driver of the torque increase from the runners in a NA application no longer applies in a boosted application, due to the fluid/flow effects from the increased pressure. The runners may, in fact, significantly reduce your intake efficiency. I say this based on my fluid dynamics work. The optimal FI intake manifold would have relatively short runners and a large plenum volume to allow for equal intake charge distribution between pistons and rapid pressure gradient elimination inside the manifold. Some shaped intake velocity stacks (like the S54 intake has internally) would probably help a good bit, as well.

[3literheater]

I hope it works out for you. Im interested to see the finished product.

[thespeedfactory]

That is the beauty of this mani. I am not too concerned with Uber high boost as this is a dedicated drag car that is raced on only 150 meters.

I have felt my performance with 26 psi, no traction, open diff, OEM manifold, and auto slushbox. I am now running 26 psi, LSD, drag slicks, and 5 speed. I need to ditch the OEM intake.

With 4.27 LSD my top speed is about 90 MPH. I am looking for max power/performance in the 150 meter.

THe good thing about the mani design is that the runners are only bent at the last 2 inches near the head. We can literally tune this manifold for best performance by removing 1/2 inch cross sections at a time on each runner and TIG back together.

THe plenum should be sized appropriatly as it works great for a twin cam 2.8. We will be playing with runner length.

The jig is mounted on threaded rod and can be adjusted to any length. As it sits in the pic it is setup for 12" of runner material. I only have slightly less that 8" available stock.

Xatlas What runner lentgth do you expect that would give the best results? I can easily trim down to any length.

[GT110]

Have you USA guys ever thought about using the S50B30/B32 airbox. It seemst to be highly effective when it comest to Forced induction.

Im not sure how easy it is to fit to the single throttle body application of the M5x (usa S-motor) though, but It might be a good starting point

[PEI330Ci]

Most BMWs have a distance of about 3.5" from the center of the intake valve head to the edge of the intake port. 13.5" is shorter than both the S50B32 and S54B32 total intake lengths.

[thespeedfactory]

Just measured my runners on my OEM manifold. ~16 inches

With the RB26 plenum larger than OEM (by nearly 3 times) and considerably shorter runners (all done I will most likely have around 9" from head to plenum)

I hope to see quite an increase over my previous setup.

I will have more pics in about 8 hours. I am going to work on it in about 2 hrs from now.

[s52e368]

waiting for more pics.

[thespeedfactory]

Moar pics

Total runner length is ~9.5". OEM is 16"

Standard 2JZ (3.0L) short runner intake manifold is about 6" for max power at ~7500-8000.

I am looking for max power at 5500-6000.

Still in progress...

[s52e368]

i think people are saying the runner are long because the perspective. they cant get any straighter than that and most are used to seeing them arched a good amount.

[DTRguy]

Originally Posted by thespeedfactory

Moar pics

Total runner length is ~9.5". OEM is 16"

Standard 2JZ (3.0L) short runner intake manifold is about 6" for max power at ~7500-8000.

I am looking for max power at 5500-6000.

Still in progress...

That plenum should be good for a decent amount of top end HP... I usually aim for 125% of engine Volume inside the plenum for a better spread of power. Closer to 100% of engine volume I believe gives less lower end midrange and more top. Have you checked the volume to see about where it is? Just my .02 Looking good though!

[SiGmA]

Originally Posted by thespeedfactory

Moar pics

Total runner length is ~9.5". OEM is 16"

Standard 2JZ (3.0L) short runner intake manifold is about 6" for max power at ~7500-8000.

I am looking for max power at 5500-6000.

Still in progress...

Doesn't look too bad. I'd like to see dynos once you're all said and done. Good luck!


Kevin, thanks for that info. I'd like to see a graph () of how your manifold measures up, but from the videos it performs as ordered!

[5mall5nail5]

Has anyone discussed plenum volume? RB26, M30B35.

[SiGmA]

Yes it was mentioned by Kevin. He was saying you should have 100-125% of motor displacement in manifold volume, so that is 3.5~4L correct? That manifold looks vastly smaller than two two-liter bottles.

[e34m535t]

I would have gone with a larger plenum for big power, especially if throttle response isn't a major concern(ie. drag racing). Looks real good though. Interested to see it perform.

[5mall5nail5]

Its deceiving comparing it to 2 2L bottles. But, you're about right. The issue I think is that the manifold may have 4L of volume considering the plenum + 6 runners, but its not manifold volume you want, its plenum volume.

[SiGmA]

Ah yes, I used a poor choice of words. I meant plenum volume, not total manifold volume. My bad.