why can't they make an upper plenum for our G like this one. it's very even air distribution....kinetix SSV suxxxxx

http://www.rsportscars.com/foto/02/f...gtb_engine.jpg

 

The next generation G will have dual intakes, so maybe they'll have something resembling this for less $$$$$$$$$$$$$ .

 

Not a bad looking bay. The plenum isnt that impressive. Its actually the part split in two above each set of cylinders.
The black piece in front is for aerodynamics (helps keep the nose planted). The air is going through those filter boxes on either side from the bottom of the car.

I'm not sure where youre getting your info on the intakes, but this thing is a V12; it can actually get some use out of a dual intake. Going dual for the sake of going dual is not necassarily going to help your performance. A NA 6 wouldn't have much if any benifit.
Could be worth it if they went with an V8.

 

^^^well, above plenum is double intake......why can't people do it just one intake? in that way, air can be distributed evenly for all inlets......

 

They could have one inlet. This design might even have one on the underside. The problem is in the diameter of the pipe. Its the same reason you'd go to a dual exhaust.
Your flow rate is going to be dictated by the ratio of cross sectional area versus wetted area (circumference x length) of your pipe. You can only make a single pipe but so big before it becomes impractical for size and packaging constraints.
That’s when you split to two. You do have some added losses there though. ex. The flow will be less if you have two 2" pipes than one 4" pipe, even though they contain the same amount of material (i.e. they are the same weight).

Area of 2 x 2”pipe = 2 x Pi*R^2 = 2 x 3.14*1=6.28sqin
Wetted Area of 2 x 2”x12” = 2 x 2PiR x 12= 2 x 2*3.14*1 x 12=150.8sqin

Area of 1 x 4” = 1 x Pi*R^2= 1 x3.14*2^2=12.56sqin (yields more flow)
Wetted Area of 1 x 4”x12” = 1 x 2PiR x 12= 1 x 2*3.14*2 x 12=150.8sqin

This means that to get the same flow from two pipes as you would from one 4” pipe they’d have to be 12.56= 2 x Pi*R^2 => R=sqrt[12.56/(2*3.14)]=1.4
Diameter=2.8”

This means more material and more weight than a single pipe.
The dual with the same volume will also have a larger wetted area, which will decrease the flow through friction. For most purposes this would be negligable. Might need a 2.801" instead of the 2.8" based off volume alone.

 

^^ yeah, this now makes sense thinking of it. you couldnt fit the same volume of fluid (in this case air) in the 2 cylinders as you could in the one larger cylinder.

 

well, i am not saying about the diameter of the pipes.....if there is a same pipe and one is located centrally where another one locates like Kinetix SSV......in SSV, the first 2 inlets get all the in coming air while the last 2 inlets have air deficit.....bigger diameter intake pipe doesn't make any differences in our G....cuz intake throttle body does not change....one thing it can be improve is double throttle body hehe which Crawfordz is working on it....6 air inlets need to get equal air distribtion otherwise each doesn't make equa HPs as we all wish ..... with the same disign as the pix i posted above, pick one left/right side would work perfectly for our G......you can check out the M3 air intake....it locates right at the middle for the 6 inlets....

http://www.rsportscars.com/foto/05/bmwm304_engine.JPG

 

two air filters to change... and i bet ferrari ones arent cheap ;p

 

^^
The whole purpose of the plenum is for that area to be pressurized. There isn't going to be a significant pressure difference across the inside of the plenum. This is going to yeild near equivilant air pressure for each cylinder.

 

^^^I believe that inside air pressure of the plenum is Negative pressure which creates a vaccum environment so it can suck air in.....all cylinders will have the same negative pressure, so which ever encounter with the air first, will get most air in....while the far end inlets will suffer from air deficit ......and most european cars tend to build so...

 

 

^^???

 

Crawfordz is working on it.....Dough gained 10hps and 8lbs of Tq......very sad result...

http://crawfordz.com/adam/Post/TB/dual1.jpg
http://crawfordz.com/adam/Post/TB/dual2.jpg

http://www.my350z.com/forum/attachme...5&d=1141184783

 

Pressure is all relative. Air will go from a high pressure area to lower pressure area. This means that the pressure in the plenum needs to be higher than that in the cylinders. Otherwise you'd have back flow, and that would be bad.
The cylinders dont all take in air at the same time. The inlet to a given cylinder will open and close as it goes from cycle to cycle. Air will be pressurizing the plenum all the while. The pupose of getting those plenum spacers is to optomize the pressure in the plenum. Based of the gains people have shown, I'd guess that the stock system was not designed for optimum performance for some reason, probably efficency.

 

That looks like its being setup for a superchager or turbo, the plenum also looks larger. That'd have to be running mad boost pressurize that much air. I'd like to see some of their numbers.
Remember, bigger is not always better. Flow depends on the layout of an entire system. Moving one thing too far can actually hurt the end product.