Custom plenum/manifold designs.

[seq4x4]

Hey guys. Iv just finished my custom intake, well not custom, improved off the original design, intake system. Its not even on the car yet and iv come up with another 2 ideas.

I have some questions. Where would one go to get a custom plenum made to my design. It cant be alloy as apparently you can weld that. So it would have to be steal, and i dont like that idea due to rust and i sure as hell dont want that going through my engine.

Post up your custom intake systems and what not. Im keen to see some other ideas out there and whats not.

Heres my improved one:


It consists of:
12mm mace spacer.
12mm mace insulator.
70mm mace throttle body.
82deg mace thermostat.
Bored throttle body hole on the plenum.
All pitting removed out of the plenum.
Port matched plenum, insulator to manifold.
Bored out the runners to remove all pitting.
Too the inlet ports out to the head size.
A tune to make it all run properly maximizing power and fuel eco.
And a nice sparkly paint job.

[cander24]

Any fabrication/machinist place should be able to assist with your new plenum design.
Oh and someone's pulling your leg re: can't weld alloy...
Cheers

[seq4x4]

Oh true. Thanks for that. Whats your opinion which way to go. As i asume the alloy will be shitloads more expensive to do, go metal or alloy? Im really worried about the metal rusting inside the plenum.

[DAKSTER]

A bit confused here. What do you actually want fabricated? Your 'custom design' appears to be a cleanup of an original one, with some Mace stuff added. Or are you suggesting that you can design something completely different that works better? Good luck lol

[seq4x4]

If you read it, i said custom and ment improved. And yes, im saying that. Im looking for other ideas as well. Iv got 2 ideas that i know will work. 1 being velocity stakes. You cant honestly tell me thats not an improvement.

[DAKSTER]

I have no idea, I dont know what a velocity stake is. I make the assumption when buying aftermarket equipment from a manufacturer with a good reputation that it has features that make it work better, but I dont necessarily know what they are.

All I am asking is what is it that you actually want fabricated, and how does it differ from currently available designs?

There are a lot of seriously talented experts designing this kind of stuff, you would need something pretty special to stand out in the crowd? Getting something made to your own design is not a matter of a few hundred bucks, you are talking thousands to cast your own design in alloy... you would want to have something pretty special to make it worth more than the tried and proven stuff you can buy off the shelf.

[cander24]

Personally it stick with alloy for your design. If you were to use some form of sheet metal steel or similar instead of alloy, use stainless.
Otherwise, proper treatment of a ferrous metal would avoid any of your worries of rust/oxidising, but also keep in mind that through the general combustion process and an operative pcv valve, the inside of your plenum/inlet manifold will have a light oil film on it in no time as you would have seen when you first disassembled it.

[seq4x4]

I completely forgot about the PCV. Might have to look into it. Whats out there already is done. Either mace or come. Im thinking something different. As suggested, trumpets, straight off the a modified manifold with bike TBs. Or a triple TB plenum, meaning each tb would be for 2 runners, even air delivery. Im looking to mess around really, that was the whole point the the intake i just did.

It doesnt have to look pretty for the first one, just to see if it works, you know? I dont really mind about chunky ugly welds at this point, i just want to play around with some different intake ideas so i can make one and have some unique.

[Not_An_Abba_Fan]

Porting an existing stock manifold will probably yield the best results anyway. Opening up the the plenum side to get the correct taper to length ratio right, but you also have to figure in where you want your peak torque. You already have a manifold spacer, that increases runner length and moves torque lower in the revs. Opening up the plenum end of the runners will move the torque back up. Be careful when removing the "rough" bits, as they assist in giving the intake air some turbulance resulting in a better air fuel mix when it hits the cylinder.

[seq4x4]

She thats one thing i never thought of when smoothing it out. Hmm, this could be interesting. But there should be some turbulence let around that area i hope, since the heads wernt touched.