With that end plate right up against the openings, and the feed hole for air on the very bottom , this certainly is not a clean flow design . (well it could be cleaner for better flow.)

has anyone thought of hogging out the bottom air feed hole (that comes from the MAF) and then putting on an entirely different sealing structure to make the intake look like some of the better designed engines in the racing world?

i think the spacer plate is a good idea, but it still misses the mark. what about an angled spacer that is the same thickness at the bottom area , as to not interfer with the injector rail, and then have it angle WAY out toward the top giving a plennum effect for the feed runners ( and clean those up a bit, since they are kind of rough)

why not take down those areas around the plate mounting bolts as they are in the way of the flow and are probably not needed for strength.

If we could find a curved piece of aluminum to make that are bow way out toward the fenders, that would be interesting too. Kind of looking like what anderson and Fan have with their Threshie intakes. Only problem might be the throttle cable mounting on the driver side.

by the way, what is the material of the S4 intake? ive heard it was Magnesium or something odd. As some know, the Holbert has this one off type intake that is aluminum. Im thinking of polishing the entire thing out, when the new Rennlist stroker engine is installed. would the aluminum of the Holbert intake make it easier to polish out. I wonder why they didnt make the production intakes out of aluminum.

I have access to a machine shop that might be able to fabricate some kind of trick covers that could have some curvature and have some greater volume as well.

mk

 

Mark I can't help but notice the Mobile one in the back ground. Is that why this engine is apart?

 

Mr. Kibort borrowed one of my pics for his demonstration. The mobil one is for my hondas.

 

Lets hope so!!!

thanks for the picture loaner. im going to dream up something. hopefully, the list can help with the design.

mk

 

The runners themselves range from very short to quite long. Like 4
to more than 8 inches I believe. That is ALOT of variation, more than will be totally solved by any size increase in the side areas - but I believe at least there could be an improvement in flow with the changes I outlined in my other thread.

 

Mark,

Nice idea, I think you would want something like a 30 degree block and cut it to the shape of the manifold.

I thought that would be cool, but if you do all that work then i figure you may as well just make new end caps all together. I was thinking something round and bulbous. Considering the contours of the front of the manifold and the rear you would probably be best to start out with an aluminum flange then some sheet aluminum and stretch it and hand form it to fit the flange and go from there. Then refinish it like the manifold. It would look like the rest of my manifold if i wringle finished it that would get it away from the sheet aluminum look which dosent match with the cast look of the rest of the manifold.

But you then need to find a new place to mount the throttle cables, or on the drivers side weld in some boss's and tap them to mount it, although it would be slightly farther out so some cables may need to be adjusted.

 

Some of the local speed shops are making their own (from scratch) intake manifolds. I'm suprised we have gone this long without seeing one for the 928.

Something like this with a connection piece that goes across the motor that is fed from the TB below:



might not be ideal for street use (lose the flappy) great for a track car.

 

Thats a great idea!! even just taking that one and connecting it like you say and mounting a stock throttle body on it would be awesome!

i guess we can take that special intake that some one was making and use that template to mount to the heads. the other stuff is just conecting the dots!

Mk

 

Todd and I have talked about this since our local turbo guru makes his own, produces 700+whp with 2.2 liters in street cars.

So it's "on the list". Problem is, it's a long list

The Corvette / Ford guys have some very nice plastic intake manifolds available. No heat absorbtion, very light and very cheap. Not sure what it would take to make a custom plastic manifold.


Quick google search:







Just search for "sheet metal intake" you find all kinds of cool stuff.

IMO "we" as a 928 group are not paying enough attention to the S4+ intake. Mark and Joe's carbon intake is sweet, but overly complex for the masses. Something like these above would do wonders for our cars.

 

Does intake pressure make these designs un-needed? Or rather, does pressure make the science of it un-needed?

 

Nope, unequal runners are unequal runners no matter how the air is delivered.

You've talked to Todd

 

just make the longer ones larger diameter and the air might not know the difference!

 

Todd played with that idea. If you want a cut up intake he might part with it.

 

I love the idea of the aluminum intake manifold. Would love to see some made. I bet you could get some serious power gains out of it. Also if you went with twin plenums you could connect them and put in a flappy and control it witht he stock hardware.

 

Wheee! it's a good night for engine tech threads! I love this forum.


1) It would take some serious coin and time to make a "plastic" performance intake manifold. Injection molds are $$$$$ to get in the door and $$$ to modify each design interation (because it's going to take a few tries). And then the high-temp materials are $$$ by the ounce, usually a pain in the **** to process, and occasionally OEM-protected so unobtainium. Right out.

2) Aluminum: where it's at. If you can cut it, weld it, try it, cut it more, weld it more, and try it again all in your garage/machine shop then that sounds like DIY to me. My buddy is tossing around custom intake ideas for the 500cu Caddy motor going in his altered '40 Chebby street-rod, I bet he tries 3 or 4 designs.

3) ITBs like Hammer and Louie. 'Nuff said.