Alternative 16v throttlebody with pics

True. What I said still stands though.

Do we have any idea of the velocities involved?


THe only way to really solve this aregument would be to stick both the tb's on a flow bench and get velocities and mass flow rates at different throttle positions.

 

But with the smaller throttle bodies being both convergent ducts and
the air speed being subsonic then velocity and dynamic pressure will increase
but after the throttle body you will have a disturbed layer of
air due to the seperate butterflies being open and the air
"bashing" into each other which disrupts the flow where in the porsche
throttle body you just have one convergent duct which will still allow
for the greater rise in velocity.



I guess you could do what vr666m said and bench test them and use the
formula of Q=Av with Q = volume flow rate and A = area of the throttle
body and then v = velocity and by using it as v=Q/A your velocity for
each throttle body(but i think that only works if it is a parrallel
duct) or you could just use the continuity equation which is



Mass flow rate (m) = density (P) * volume flow rate (Av)



or to find out the speed at which it leaves the throttle body due to it being a convergant duct then it would be



pAv1*v1 = pAv2*v2



but for the normal throttle body this equation would have to be used
twice due to there being to throttle bodys or you could just use it
once and see what the result was.



cheers ryan

Correct me if i am wrong anywhere as it has been a long time since i have dealt with this sort of equation <!--
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