Musings from the shop
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E21 is getting a valve quantity upgrade. 38% moe powah! Just doing a test fit to see how this is going to work. I have 3 engines now. One is toast and the other two need a rebuild. I was thinking of getting some low compression pistons made and going turbo right away, but now I'm thinking it will be a stock rebuild. It changes from one day to the next...
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That was my original plan, but I wasn't planning on having to do a rebuild right away. Also considering skipping the turbo and keeping it NA. I really like the sound of ITBs... Superchargers are cool too though... Lots of ideas, but for now I should really just focus on getting it in the car and running.
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Turbo that mofo!!
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Seriously!! I have m42 exhaust manifold dimensions if you want me to make a flange
Are the heads 2 cylinders short of the 24v on the intake side too? I could help you build the intake. I'm building one right now for my car.
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sk8 or die
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I believe they're the same, but I haven't really looked into it yet. I've heard of people buying 24v turbo manifolds and chopping them down.
At the moment I'm leaning towards a NA build, but I haven't even gotten the block to the machine shop or dropped the subframe yet so it's a long way off.
Induction noise is a beautiful thing:
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You're going to machine those? Looks like a difficult part. Damn kids and your fancy computerized equipment!
Just kidding. Honestly though I have some kind of pathologically masochistic DIY-or-die complex. I'll probably just go after a piece of flat stock with a hacksaw, some big drill bits and a file.
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Honestly man, I guarantee you could learn how to draw that up, and machine it within a weekend. No one taught me how to draw 3d, so I just mess around with it at work until, well, something works.Â
The shop is in Green Lake, if you are ever interested in checking it out, or building your own parts, I have keys to the place and can come here 24/7. Only 1 shift 7-330.Â
Transition piece is much short. So I think around 2" alum billet flange for the transition is what I need. And go to larger tubing.Â
Port has a perimeter around 6" and 1.75 ID is 5.5 about so I need larger runners. 2" ID will get me ~6.3" which is just slightly larger(which is assume is what I want)Â
Dammit I need to go to school for engineering already.....
sk8 or die
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That's cool. I'm from Menasha, so you're not that far from me. I might have to take you up on that some time.
I wouldn't necessarily assume that the you need to keep the tube the same size as the port, but it's probably not a bad idea to do it that way. To do it right though, you have to look at the area of the opening, not the perimeter, as well as the length of the runner from the valve to the end of the tube.
The engineering concept that you're looking for is called "Helmholtz resonance". The wikipedia entry does a good job explaining it. The mass of the air in the runner causes it to have inertia, and the atmosphere outside the tube essentially acts like a spring. Putting some mass on a spring gives you a resonator. Changing the diameter or length of the runner changes the mass of the air inside and tunes the resonator to a different frequency (rpm).
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The bolt pattern is the same but they're a little wider. If i switch to vented rotors I think they'll bolt right up. Otherwise I may have change the spacer between the two halves. I'm confident that they can be made to work without too much work.
I've heard that they're used as an upgrade for air-cooled 911s too, so I feel lucky to have picked them up for a reasonable price.
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