Why is it that all the ITB i see are the butterfly design. Would a slide style not outflow it? You see it all the time on small engine carbs and even little r/c motors have a form of a slide style. Why is it not popular with throttle bodies?

I beleive they aren't that good for daily drivability but why not for an all out drap application?

I'm sure there is a simple explaination but i don't know much about them.

School me

 

think about the amount of space that would take up.

 

They're used in some race cars, i'm sure someone will post pictures.

 

slides flow weird at part throttle, great at WOT