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Old 01-27-2004, 07:49 PM   #11
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VANOS is variable cam timeing but BMW does have variable intake runner length.
The six cylinders all have a flap that varies length depending on rpm. The new 4.4l V8 has an infinitly variable intake manifold. It is kind of a cooll setup. The manifold has a motor on the back that can move the interior runners to change the length. This works with the variable cam timimg (VANOS) and the variable valve lift (Valvetronic) to make an engine that runs very very well.
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Old 01-27-2004, 08:17 PM   #12
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Oh yeah. My bad.
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Old 01-27-2004, 11:00 PM   #13
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Quote:
Originally Posted by willwren
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.
That'* awesome. Do you have any more info on this? or your source perhaps? I would love to know more about this.




The nissan 3.0l has a 'middle eastern intake' which also has variable intake length. It works with the pressure from a retracting intake valve to compress more air into each cyclinder. I think it has two diffrent paths for two diffrent rpm ranges.
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Old 01-27-2004, 11:33 PM   #14
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Sadly, as much as I'd like to, I can't reveal this. For those members who think they know, please don't venture any guesses here.

It'* extraordinarily expensive to fabricate, and alot of design time and effort went into it. With possible patents at stake now or in the future, we need to keep it quiet for the time being.

Don't expect this to be available any time soon if at all. VERY expensive.
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Old 01-28-2004, 01:46 PM   #15
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Yeah looking at the number of runners and direction of the 3800 I could see the difficulty. The Porsche, on the other hand, has carburators standing on two standalone tubes, extremely simple design. I wanna talk him into doing this. I could see the hookup being fairly simple. A vacuume sensor that emits more voltage according to manifold pressure. Say -5psi = 5v, that voltage would go into a setup that will correctly acuate the motor to raise or lower the intake. Looking at it I don't see why $50 wouldn't get the whole setup. The only problem would be figuring out how to make the throttle linkage accomidate to the movement.
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Old 01-29-2004, 12:23 AM   #16
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Quote:
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.
I bet I know!
CBN status would keep me quiet
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Old 01-29-2004, 04:25 AM   #17
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Would intake runners make a difference on the L67? I know we really don't have any to speak of, other than the ports themselves.
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Old 01-29-2004, 04:27 AM   #18
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Not possible....and unnecessary. Ours are technically SHORTER anyway. It'* alot easier to start long, and shorten on demand.

We blow. Therefore we rule.
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Old 01-29-2004, 04:30 AM   #19
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So if a Bimmer owner puts a CSC on with the variable intake runners, he should deactivate them?
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Old 01-29-2004, 04:33 AM   #20
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Totally different. A CSC or Turbo may still benefit from them, as they run a traditional upper intake. Our runners as you may assume, are not really there. You need to measure the distance from the rotors of the SC to the lower intake ports. VERY short in our case.
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