Carl Fausett

My favorite designs are the ones that are so clean that they look obvious. This is one. Very deceptive - but all the volumes needed, the intake runner taper, the runner length - it's all in there. We were able to finish with a very clean design.

You'll note that the roof is slightly convex, this performs better both NA and boosted - and the curve creates a self-supporting structure that will hold up under boost better than a flat top would.

I will post pics when we mount it on the engine.

Catorce

Really a clean design, can't wait to see the real deal.

SwayBar

What is the penalty for lowering the plenum height back to stock intake height?

Does the loss of volume make an appreciable hp/tq difference in the simulation output?

Looks very nice...

Carl Fausett

We went all-out about performance without compromise on this manifold, so much so I OK'd that the manifold did not have to fit under the hood if that would help output. So I know we arrived at the height that it is for good reason.

I do not have an iteration a half inch shorter to look at, I'll ask the engineer that modeled it for me what he gained in that last inch.

hans14914

Carl,

You may want to double check that mounting position for your throttle. In the rendering, that flange eyeballs parallel to the rear of the last passenger runner.

Extrapolating that to the models of intake stuff I have made here, that would only leave you 125mm from the flange to the firewall, which would not leave a lot of room for an off-the-shelf throttle and filtered air plumbing. If they have it tacked together, I would test that really quickly, as you may need to push that throttle flange towards the front a bit more, or just machine your own slim throttles.

Chevy style single-plane manifold should be a nice combination with your centrifugal-style supercharger kits. Looking forward to seeing the results.

Oh, if it helps, I still have plenty of the temp sensor relocation kits for the water bridge if you need any, but the height of that eyeballs that the stock sensors should clear.

Carl Fausett

Thank you Hans, I'll look into that. We mocked up on a complete 928 block and heads package so we were sure of our space envelope. We had the oil filler neck on it too.

Oh - and for those that are wondering - the fuel rails will be included with the intake manifold and the mounts for the fuel rails are built in (not shown in the renderings I posted).

Carl Fausett

Hans, just reviewed some of the straight-down from the top drawings that I have here and I see that the mount for the TB is forward of both cyl 4 and cyl 8 intake runners.

Is it forward enough? We'll see...

James Bailey

Every intake manifold IS a compromise..... that comment is just stupid.....sadly you do not realize that. But you paid someone to design an untested intake now you simply need to MAKE it and try it..... then go on to 2.0 , 3.0 etc. , this stuff is easy

Catorce

Jim,

What Carl means is that the intake is designed without the compromise of fitting under the hood and the other packaging constraints of the 928.

hans14914

Great to hear Carl. I was pretty sure you checked that number, but sometimes those fixed views are deceiving. In my experience, the "no-go" plane is 150mm behind the centerline of the rear passenger injector (as measured on several 87+ cars). 150mm is still tight, but you know if its further than that, it will likely hit the fuel cooler... etc. Just a friendly finding if you wanted to compare notes.

To that end, the Jenvey LS throttle is a really nice part... its not the prettiest, but the progressive action on that throttle is really nice (I play with all the throttles at PRI every year, and this one still was the standout from the functional standpoint for me):

http://www.jenvey.co.uk/products2/la...90mm-ls3-sfg90

Carl Fausett

That's a sharp looking throttle body and I am glad you have some experience with it. I switched to a MSD TB last year with a parabolic throat for better tip-in modulation and really really like it. Its the one in the pictures.

Can't wait for the intake to get here from finish welding! The last thing we were setting up was the fuel rail mounts. Shouldn't be long now.

Carl Fausett

Correction: I paid an experienced intake manifold builder to co-design the intake manifold with me.

I have designed and built intake manifolds before, and the process is available for review on our website as .pdf downloads for each of them. Both of those manifolds got built, and they performed well in the real world.

However, this time, I wanted reproducible results, so the design had to include ease of manufacturing. So yes, I reached out to a manufacturer to help me design it so that I (hopefully) I can order more and sell more of them. Not a one-of unit like before, a production unit. I think that is a big step for the 928 community!

Honestly, I thought partnering with an experienced intake manifold manufacturer would be perceived as a good thing. More eyes on the design, more input from experienced, knowledgeable fabricators, all good.

It will get tested the moment it gets here.

Carl Fausett

Adam,

I am ordering the custom intake manifold gaskets to match your new manifold now. We're getting close!

Catorce

Nice!

V2Rocket

carl, that looks like a kick-*** intake.