Intake Manifold Idea - non bonneville - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 01-27-2004, 02:39 AM   #1
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Default Intake Manifold Idea - non bonneville

Well I guess it technically COULD apply to a bonneville but it'd be a lot more difficult. My friend has a 75 porsche 914 with two weber carbs. The carbs sit on their own set of dual intake runners on each side of the engine. Basically they're just two tubes that are the "intake manifold". They stand about 7" tall. We know that shorter runners = low end torque and longer = high end power. I was thinking about cutting 2-3" out of the tubes and using some flexable hose to reconnect them. Using simple hose clamps at each end. I could use an electric motor attached to a metal pole with teeth in them so when the motor is turned the pole will move up or down, depending on the motors direction. Attach the motor at the base of the manifold and weld the pole to the top of the manifold. Now I'd have to find a way to let the motor sense the intake pressure and raise and lower the runners as rpm'* increase or decrease respectively. I think it'll work because the intake isn't under any kind of extremes, heat or pressure. Plus I've seen I think it was mercedes do something like this but his setup is so much simpler. What do you guys think?
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Old 01-27-2004, 02:52 AM   #2
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BMW'* VANOS system varies intake runner length.
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Old 01-27-2004, 03:06 AM   #3
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yeah cool....think it'd be that easy to re-create?
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Old 01-27-2004, 03:47 AM   #4
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I could probably do it. I would probably need a laptop to run a simple program to run the runners. I could have the electric motor perform a certain number of turns to correspond to voltage output from the MAP sensor, incrementally. With whatever voltage increase corresponding with pressure change, do so many turns. It would need some sort of computer control. I could do it with LabView.
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Old 01-27-2004, 10:54 AM   #5
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Wouldn't you have to change a lot of things on the main computer? Aren't the sensors going to read differently?
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Old 01-27-2004, 01:03 PM   #6
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You'd want to remap your fuel outputs per RPM.

Kinda along the same lines, in Hot Rod magazine, a guy has a twin turbo Impala SS 1996. He has a switch to go froms streetable 760HP @ 14psi to a 1000HP race setup @ 26psi.

But the cool thing is, he has two cylinders cut out of the v8 for launching. This creates higher pressure in the manifold for launching, it'* all controlled by a special computer, that reactivates them at the perfect time.
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Old 01-27-2004, 03:20 PM   #7
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Guys, it'* a 75 Porsche. I don't think it has any computers.
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Old 01-27-2004, 03:46 PM   #8
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A variable length intake runner upper intake manifold was built for the L36. Only one. It worked, but was cost-prohibitive to produce and sell. It produced insane power, and would require a heavily built trans to put that power down safely.
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Old 01-27-2004, 04:43 PM   #9
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Quote:
Originally Posted by jwikoff99
Guys, it'* a 75 Porsche. I don't think it has any computers.
Oops, sorry. I gotta get my head out of the present.
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Old 01-27-2004, 06:45 PM   #10
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Yes you could do it, it'd be a lot of linkages, and such, maybe easily hurt, but yes.
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