twin throttle body setup

[commy92]

im not sure if this would work on an n/a system. Ive seen it in action on a twin supercharged v6 motor. see imaged attached. Would this work or would there be no gain in performance.

[statesman_wagon89]

The best intakes are the ones that have individual runners into each intake port, like this one (see attachment)

[commy92]

so your saying a tb for each inlet??

[fabz]

so your saying a tb for each inlet??

That would flood the engine ha ha and be very expensive!!!

[Blown V6 Hatch]

Cant see why it would not work on an n/a set up. Cant really say what sort of performance gain to expect but it would certainly add a lot of WOW factor to the engine bay. Did you see it on the twin supercharged gemini in the latest street machine? I am thinking at doing the same thing to my factory supercharged v6, i need to do some more research though!

[Blown V6 Hatch]

That would flood the engine ha ha and be very expensive!!!

How did you work out that it would flood the engine? The throttle body does not supply fuel to the engine. A throttle plate for each port with long runners is the ideal set up.

[defa]

That would flood the engine ha ha and be very expensive!!!

i am also not understanding how 8 throttle bodys would flood a motor. what about some sr20 turbos's have quad throttle bodys. i would think that if you have a throttle body for each runner you would get an even amount of air into each cylinder. wouldn't that be better..
An N/A motor will only suck what ever air it needs..
the only way a motor could be flooded with air is if it is supercharged or turbo's and there is not enough fuel.. which would be called running too lean

[greenfoam]

The best intakes are the ones that have individual runners into each intake port, like this one (see attachment)

You guys all missed the fact that, the manifold pictured in the post is not a individual runner manifold, it's a single plane manifold with long runners, there would be a cover for that manifold that seals it up and a throttle body or two attacted to the cover

Here are a couple of designs used for V6/8/12/16 etc IR manifolds

The V8 Supercars would run something with short runners, something like the black one

[Wonderboy]

i think they work out the volumetric effiency under the most common rev range or something to figure out the width and legth and shape of the trumpets, you would have to ask an engineer or someone who knows what they are talking about to figure that kind of stuff out.

[geta]

the length and size of the runners depends on what rev range you want max power. As the intake valve closes, especially with a lumpy cam, it creates a shockwave going back up the runner, once it reaches the end of the runner, it will travel back down the runner in the same manner, even though there is an open gap at the end. The goal is to have the air shockwave reach the valve again just as it is about to open. Having smaller diameter runners will increase the speed of the air, however you will need longer ones, or you can have a shorter one and work out that the air will "bounce" back and forth, say twice before the valve opens again. A larger runner will have more air behind it.

This is by no means a complete explaination and is only how *I* understand it.

-dave

[statesman_wagon89]

It is to my understanding that a longer intake tube ( runner) will deliver better air velocity and thus better a better torque range. This especialy applies in the high rev range, as for a trottle body for each intake tube, this would really increase throttle response

[greenfoam]

It's really nothing to do with the air velocity, it works how Dave/geta says, it creates positive pressure when the shock wave leaves the runner and is inverted and reversed back toward the valve, I believe it can be 3 psi or so when the manifold is running right in the middle of its tuned range, you can gain boost on the 1st second and even third return travel of the shock wave or all three it's all about length and timing the sound waves to be around the same revs as you cams timing and header tube length (which should cause suction at the valves when they are both open during the overlap), then you get more inlet charge comming into the cylinder for free, All that and the airflow in the manifold and heads it where 90% of your horsepower comes from

[commy92]

thanks guys i sorta understand alot better now. And yes i didnt get the idea of the twin supercharged gemini...its my backgroud pic has been for ages