TB Butteryfly Orientation

[Don®]

After some contemplating and design flow simulations I have found that TB Butterfly orienation is important for better flow distribution into the plenum and runners. The butterfly should open on the verticle axis with the open angle facing the back of the plenum opposite the ports of the runners. This will allow airflow to travel alongside the back of the plenum creating somewhat a curtain of air to travel in all directions by deflection towards the runner openings from TB angle @ PT thru to WOT.

If the open angle is positioned towards the runners you can imagine the direction of airflow to travel directly into runners 1 & 2 for Passenger side TB and 3 & 4 for Drivers Side TB from TB angle @ PT thru to WOT.

...I've been considering how well a TB valve in an iris configuration would work. The opening would better control flow into the plenum without augmenting the angle of flow into the plenum.

[20V18Tnut]

So the optimal position would be to clock the TB 90 degrees clockwise? I think you got a good point here!

[Don®]

Yes Sir 

Mine is positioned as such on my TT225 intake mani.

[badger5]

After some contemplating and design flow simulations I have found that TB Butterfly orienation is important for better flow distribution into the plenum and runners. The butterfly should open on the verticle axis with the open angle facing the back of the plenum opposite the ports of the runners. This will allow airflow to travel alongside the back of the plenum creating somewhat a curtain of air to travel in all directions by deflection towards the runner openings from TB angle @ PT thru to WOT.

If the open angle is positioned towards the runners you can imagine the direction of airflow to travel directly into runners 1 & 2 for Passenger side TB and 3 & 4 for Drivers Side TB from TB angle @ PT thru to WOT.

...I've been considering how well a TB valve in an iris configuration would work. The opening would better control flow into the plenum without augmenting the angle of flow into the plenum.

hehe
thats funny.. only posted something on these lines on vortex earlier this morning..
spooky..

will have a look myself soon. see what does what.

[badger5]

...I've been considering how well a TB valve in an iris configuration would work. The opening would better control flow into the plenum without augmenting the angle of flow into the plenum.

damn Don.... you able to look into my computer??? lol

seen my twin slide throttle and iris throttle idea's?

tumble etc is a factor on n/a motors, where throttle angle on open is <90 degrees to introduce tumble into the cylinder. But this is more important on a t'body close to head in a single throttle per cylinder configuration with injector just downstream of the throttle plate.

[Don®]

Tumble should happen between the injector and intake valve. I would think better more laminar airflow is optimal for more flow to the ports.

[badger5]

Tumble should happen between the injector and intake valve. I would think better more laminar airflow is optimal for more flow to the ports.

yea I agree... just comparing t'bodies and their relative open position vs the plenum setup.

I might rotate my OE t'body on the existing plenum when I get it running and see what happens on the dyno.
got a lot of tests to do tho to determin what does what, what works and does'nt etc.

all good fun.

cheers Don

[Don®]

yea I agree... just comparing t'bodies and their relative open position vs the plenum setup.

I might rotate my OE t'body on the existing plenum when I get it running and see what happens on the dyno.
got a lot of tests to do tho to determin what does what, what works and does'nt etc.

all good fun.

cheers Don

Sounds great 

[transient]

sounds like something to play around with once a bunch of us get those fancy pants 007 manifolds

At least this mod is free

[silvercar]

Can't really comment on many differences other than just an overall smoother feeling in the throttle.

Ditto. but i didnt really give it much thought when i flipped mine.. I removed it to clean it and the swirls in the oil convinced me