Subject	I think that would be more the case in an NA application
Posted by	aliaZ on December 26, 2011 at 1:01 PM
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In Reply To	I would be more inclined to believe #5 and #6 actually posted by Ash's Z on December 26, 2011 at 01:32 AM
Message	where the cylinders draw the air in. In a force fed application I would expect the rear cylinders to get more than their fair share because the cross section of the plenum is too small compared to that of the runners, and acts as a funnel of sorts. Granted, I haven't done any CFD analysis before, so I could very well be talking out of my ass. Ideally, the plenum will act as a "sub-atmosphere" to feed the runners, in which there are no significant pressure gradients from one end to the other. I think that is what they are trying to accomplish here. This has been around since the 80's, and still shows up on some race manifolds. I'm not sure of the downsides to this approach, but i'm guessing that your approach to your upcoming manifold release is a bit different.
Follow Ups	interesting (long) thread on plenum design - aliaZ 00:27:34 12/26/11 Re: interesting (long) thread on plenum design - Ash's Z 00:54:16 12/26/11 yes, they are assuming steady flow - aliaZ 01:14:46 12/26/11 Yep, garbage in = garbage out :) - Obeeone 22:57:25 12/26/11 I saw one of those at Laguna seca last year - BlackholeZ 01:14:06 12/26/11 it would be great to have a more balanced plenum - aliaZ 01:21:51 12/26/11 I would be more inclined to believe #5 and #6 actually - Ash's Z 01:32:23 12/26/11 I think that would be more the case in an NA application - aliaZ 13:01:18 12/26/11 here is a VG30 manifold - aliaZ 01:56:38 12/26/11 Interesting. Any reason to keep the runner that long? - BlackholeZ 02:33:54 12/26/11 the only thing I can think of is to maintain mounting points - aliaZ 08:42:27 12/26/11 Another is: because it's a street car that spends 95% of its - LitlElvis 11:36:04 12/26/11 I hope to get a package in the mail to you shortly (n/m) - aliaZ 12:50:51 12/26/11 good point, I guess more of a race-mod (n/m) - BlackholeZ 13:01:12 12/26/11 another example - aliaZ 10:30:10 12/26/11 The GTR's plenum looks very well balanced by having the - TheTwinZ (Peru) 13:43:28 12/26/11 Its crazy how much it looks like a evolution of ours. (n/m) - sandmanz32 20:02:59 12/26/11 In a lot of ways it is... - RedBeauty84zx (San Antonio) 15:12:18 12/27/11 when you can't make something awesome as - sandmanz32 21:21:12 12/27/11 That's because it *is*. (n/m) - Bernie (NoVA) 23:48:51 12/27/11
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