sketch of 3,2 intake adaptes to 3,3 engine needed

[ornas]

hi, maybe someone has sketches of adapters to fit 3,2 intake on 3,3 turbo engine?

[A930Rocket]

Your English is better than my Lithanian!

I don't think you need adapters, but you do need the 3.2 spacers. See the "930 EFI Candy"thread. You can see the runner ending in a small spacer.

[David]

The best thing to do is open the head intakes to 40.5mm. If you don't want to do that or don't want to pull the heads and option would be to make 3.2 spacers with a 4.5mm radius change from 41 to 32mm.

[drmatera]

we used 1/2" thick aluminum. Port matched the top to the carrera intake and the bottom to the 930 head port. Then ported the spacers to make the transition "funnel like". works great, i have no wierd dips in the power curve

[David]

Since changing from 41 to 32mm over such a short distance would require a large angle which would cause a lot of turbulence, it seems like a radiused spacer like the picture below would flow better:

[drmatera]

David, I don't think the radius would be good. Seems like it would cause the air to tumble as it hit the radius

This is what we did

[David]

A radius causes a stagnation point where the fluid (air) stops and then stays attached to the surface as it goes around the radius. A large angle acts as a ramp to launch the fluid out into the flow causing turbulence. Or at least that's what I remember from my Fluid Dynamics class.

[drmatera]

I'm no fluid dynamics expert, but i would like to see the results

[TurboKraft]

A set that may help simplify things...



TurboKraft : Catalog Home : Carrera Intake Maifold Adapter Set [930 110 459 TK] - $274.00

[Flieger]

Originally Posted by David

A radius causes a stagnation point where the fluid (air) stops and then stays attached to the surface as it goes around the radius. A large angle acts as a ramp to launch the fluid out into the flow causing turbulence. Or at least that's what I remember from my Fluid Dynamics class.

This sounds right but I think it would be even better if you had a concave (to the air's point of view) curve transition into a convex curve.

[Flieger]

Like this:

[David]

Actually, at higher velocities even the concave to convex will cause turbulence. It's having the stagnation point that keeps the fluid in contact with the walls and not jetting out into the air flow.

Look up some flow measurement devices for some examples of low head loss designs.

[9dreizig]

David is probably right on this one (quick ask him an electrical question,, that always confuses the mechanical guys ..

[Flieger]

Originally Posted by 9dreizig

David is probably right on this one (quick ask him an electrical question,, that always confuses the mechanical guys ..

Well, I am an ME student but I have not had Fluid Mechanics yet, just plenty of rigid body dynamics, materials stuff, and some other misc. physics courses. I would like to take some basic Aero stuff.

[David]

Originally Posted by 9dreizig

D...that always confuses the mechanical guys ..

That's an understatement!