Great job on the fabricated intake.

Tom Vaught

 

Here are some mostly finalized pics of the one we have been working on for a few months, its for a 4.6 3v. This is the third and final version we are going to fully build and test. We went away from transitioning the rectangular runners to round tube with velocity stacks and the excessively large plenum volume we had to this revision, keeps the rectangular runner shape the whole way with larger higher flowing runners and less volume in the plenum. Got us almost 2 more inches in runner length as well. Look forward to seeing how it does.

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Still looks like you will have a large plenum volume (much more than the typical race 4 bbl intake on a 2 valve engine).

Nice work.

Tom V.

 

New to this thread but I just read it entirety and found it very interesting.

 

so is the marcella intake manifold shape the way to go?

 

I have got it together and have been putting some miles on it. All has been great and everything working very well so far, I have been bringing the boost up slowly since I have to make a tune from scratch

Cam and intake seen to be working very well together

Makes around 14hg at idle.

I had been worried about getting up on the brake with the big turbo (gt55) after changing the cam and this intake vs the stock intake with long runners as it was on the edge with the last motor. But surprisingly it pops up on the brake easier. So that is a good deal

Also. I was worried about throttle responce and if it would be goofy or really slow with the intake layout like this. But it is quite the opposite compared to the old motor setup. It is very snappy. It doesn't take but a quick jab to put it on the limiter in neutral. Wasn't expecting this

The fueling corresponds to this too. My tip in fuel is quite high, if this is do to the large plenum volume or what I don't know. There is no bog or sputter, I will get a vid of this

Also seems to have shifted tq about where I want it. Only spun ot to 7500 so far but VE peaks at 7k and it is very stable from 6k all the way to 7.5k so far



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It is super quiet and mellow
2015, LSX done, rx7 - YouTube

Rx7 - YouTube

 

How's the distribution to each cylinder?

 

Glad your Project Intake is working so well.

A Lot of nice work there!

Tom V.

 

Thanks! I am very haply so far.

The plugs have stayed consistent so far, though hasn't been on that much power yet.

Here is a pull on my street tires so it ramps from 4psi at 30mph to 16psi at 90mph. You hear me hit the limiter at the shift, that is 7500. Strong up there. This is 17* of timing on e40. 5th pass water at 90*

Lsx rx7 16psi e40: http://youtu.be/FV2ly3xxrig


Here is on the brake, this a a gt55 and a tight converter, 4200rpm and 10psi there, 15* of timing, need more timing there

2015 transbrake rx7: http://youtu.be/kvEwP1c66Ec

 

Fantastic! Looks like a run ride!

 

zbrown, where are you located? If you are close to bham alabama I'll let you use my dyno for free so you can really show everyone the gains. With 16 pages of buildup I'm sure I'm not the only one interested.

 

Hey man thanks I wish I could take you up on that. I live in bumfuck north Dakota though haha

OK back onto some data

Been putting alot of miles on, runs well no issues, been turning the power up so time to finally dig into some plugs


Here we have e50. Br7ef plugs, 15* at 5k ramping to 18* at 7500rpm, this is warming the car up, swapping the plugs in on the side of the highway and them killing it and coasting and pulling the plugs


This is ramping the power in slow but I am touching just about 20psi and 7500rpm at shutdown (175mph)



Anyway you can let me know what you think, I will do some cylinder trimming and report back pics

Cylinder 7 is the warmest hole for sure


So number 7 for sure needs some, and so does 1,..... 5 and 8 need some out

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Hopefully it's OK to post this here, my apologies if not

I was just after alittle feed back on the new intake top 'box' Im designing/fabricating

This is for a 289 windsor with a t70 turbo, running 15-20 psi

First this is the current set up, its mounted to a ported truck lower, I think all of the squared of edges and the way it tapers down to the ports is pretty inaffective and I worry about how even the distribution is

The new design ( CAD images ) will be bolted to a Edelbrock Victor EFI lower I have, I have formed the main plate and tried to remove as many corners as possible, I have also added a splitter/ diffuser to help direct the air as I worry about having distribution issues with the end ports. So I guess Im asking if the splitter is nessesary and if it will help even out the flow to all cyclinders, is the basic design sound or are there any tweeks that anyone could suggest? I was thinking that it might be better to have it angle down more at each end with more of a hump style though I wasnt sure how much that was likely to help

So any input would be greatly appricated

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Re: Intake manifold design - 4200 vortec complete

A few pix of the design and build progress - engine is a Vortec 4200.

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The fuel maps needed to be retuned. No dyno results yet but the turbo spools a lot harder than it used to with the old plenum. And rolling about 20 mph going from 10% to ~75% throttle the turbo spooled hard enough the front end of the truck came up about 6" and squatted the rear suspension - it never did that before - so I believe that the mid range torque is way up. Same amount of overall boost - 8 psi.

 

Big Congratulations on a job well done and a recognizable torque improvement due to the intake.

Tom V.

 

Re: Intake manifold design - 4200 vortec complete

Very nice efi-DIY !! This intake is truly a work of art, all the cnc work done to it, planing and building. I'm happy it worked out for you.

 

Thanks

I think part of the improvement can be attributed to de-coupling the throttle body from the main plenum. The "hat" diffuses the air and may allow the air to enter the main plenum in a laminar flow..

Kinda curious if any improvement could be had with a full rad runner inlet mounted on the plenum floor?

 

Any updates to any of these intakes? How about the Buick V6?

 

Would you think it would really be laminar flow?

 

Most non fluid dynamic savy people do not use the Reynolds number to determine/define flow (laminar ---- transition ---- turbulent)......seemly "laminar" is used to describe flow with smooth stream lines......However I think the poster is using it to describe that it buffers the larger swirls/turbulance (not from the boundary layer) from the throttle body.