F20C Engine Study
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From: Dry Branch
Originally Posted by tof,May 30 2007, 09:24 PM
I'll take this one since it gives me a chance to talk yet again about my Galant VR4. 
There are a lot of flavors of this awd turbo in Japan, including some with a "cyclone" intake, a perfect example of variable intake volume. A lot of JDM 4G63T engines come into the US with these intakes. Some Galant VR4 owners install them as an upgrade.
The Goal:
Long intake runners provide better low end torque by producing higher flow velocity at low RPMs. Short runners provide more high end power because they allow better less restrictive breathing at high rpm where flow volume is more of an issue than flow velocity. (Any wonder the S2000 uses low volume short direct runners?)
How they work:
On a variable volume intake there are two sets of runners built into the intake, one longer and one shorter. Air is directed through one or the other set by valves that transfer the intake flow from the longer runners to the shorter ones as RPMs rise. The idea is to give you the best of both worlds, kind of like if you took mild cams for lower rpm grunt and combined them with more radical cams for better....oh, yeah, we have that already.
There are a lot of flavors of this awd turbo in Japan, including some with a "cyclone" intake, a perfect example of variable intake volume. A lot of JDM 4G63T engines come into the US with these intakes. Some Galant VR4 owners install them as an upgrade.The Goal:
Long intake runners provide better low end torque by producing higher flow velocity at low RPMs. Short runners provide more high end power because they allow better less restrictive breathing at high rpm where flow volume is more of an issue than flow velocity. (Any wonder the S2000 uses low volume short direct runners?)
How they work:
On a variable volume intake there are two sets of runners built into the intake, one longer and one shorter. Air is directed through one or the other set by valves that transfer the intake flow from the longer runners to the shorter ones as RPMs rise. The idea is to give you the best of both worlds, kind of like if you took mild cams for lower rpm grunt and combined them with more radical cams for better....oh, yeah, we have that already.
Our RX-300 has a similar setup. A "flapper valve" in the intake is actuated using vacuum that is controlled by the ECU. I think the engine is the same in the Camry and other 3.0l V-6 Toyota/Lexus engines.
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Joined: Apr 2007
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From: Long Beach, MS
Originally Posted by iKMTi,May 30 2007, 09:56 PM
awesome. now where the F22C? hahaa
9 > 8
(36 days and I'm already starting to feel right at home here.
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Joined: May 2005
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From: So Cal
Originally Posted by tof,May 31 2007, 10:31 AM
I suspect no one found the F22C a worthy subject for publication of such a white paper.
9 > 8
(36 days and I'm already starting to feel right at home here.
9 > 8
(36 days and I'm already starting to feel right at home here.
F22C FTW!!!!
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From: LittlecountrynamedBelgium
Originally Posted by tof,May 31 2007, 07:31 PM
I suspect no one found the F22C a worthy subject for publication of such a white paper.
9 > 8
(36 days and I'm already starting to feel right at home here.
9 > 8
(36 days and I'm already starting to feel right at home here.
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