I was thinking about the design of current butterfly throttle boddies. Now physically when the are goes around the butterfly valve, doesn't it act like a wing and create a low pressure behind it? That would cause
1.turbulence ('scuse the reference wink
2.and lower airspeed

Now after messing with some camera's this weekend i got the idea for a better design.
Wouldn't a IRIS design work better?
Think camera's and stargate SG-1(iris).

Anyway, i'm not a rocket scientist or assuming that I know **** about anything. Just kind of logic and what-if situation's.

 

I see where your coming from and it sounds good in theory.Im not sure how much difference it would make though, true every bit of restriction removed is a benifit.The only problem is that would be prety hard and expensive to make as it probably would be easier to control by chip than a wire,due to the fact of so many moving parts.

 

Be a dame lot of moving parts. More parts Higer $$ and a bitch to fix. But the point is valid.

What about a ball joint. Roll the ball in and out of a socket. Maby a disk from the side like the door in Deepspace nine.

The funny part is we are all using sci-fi shows to talk about throttle bodies.
rolleyes.gif

 

motorcycles sometimes use throttle bodies or carbs that use a blade that comes in from one side. That said,

You will NEVER cease to have air turbulence (does it really decrease velocity? I'd think less area to pass through = increased velocity) with a conventional throttle body. The only way I can think to make a smooth passage is to use a flexible pipe that contracts to close throttle and then opens to open the throttle. Picture a regular sock, like you've got on your foot right now. Cut off one end and let it dangle, but support the opening on top so you can see inside. Hopefully you are looking at an open-ended cylinder now. take the other hand and squeeze all the way around the sock right in the middle. The thing contracts down to a bottleneck on both sides of your closing hand. This is the only way I can think to make a smooth-flow throttle body. Cable operated or something to squeeze it.

Or you could just make like the new generation valvetrains and eliminate the TB altogether with adjustable lift valves & whatnot.

 

BMW's latest double VANOS engines do NOT have a throttle body. The ECU controls valve timing and lift to such a perfect extent, the throttle body butterfly is not needed.

The part you are missing is that the Intake manifold is in a vacuum state at all times. Even at Wide Open Throttle, the air pressure inside the intake manifold is less than outside air, thus, air gets sucked into the engine. The slightly low pressure area created when the butterfly turns at an angle is insigificant compared to the large vacuum created at low butterfly opening angles.

What is affected by Larger and larger throttle body butterflys is low/very low throttle response. As an extreme example...It is very hard with a large 100mm throttle body to just accelerate a little bit. Just cracking the butterfly lets so much air in. VW solves this by using dual Throttlebodies. They have one larger unit that operates all the time, and a smaller secondary unit that only starts to open once the main TB is open past 50%. This allows a much more "linear" response out of the throttlebody.

So..if I were to redesign the TB...I would go with a similar system to VW...it works rather well. But it does make modifing or purchasing a new larger TB rather expensive....