Miata Turbo Forum - Boost cars, acquire cats.

- Bellengineering - Miata Accessories (https://www.miataturbo.net/bellengineering-miata-accessories-31/)

- - Begi Intake Manifold (https://www.miataturbo.net/bellengineering-miata-accessories-31/begi-intake-manifold-27089/)

You might want to check out Magnus Motorsports. They make some awesome stuff, but nothing for our application. If I was designing a manifold, it's a place I would go to get a few ideas that are proven using software and then confirmed on the dyno.

Quote:

Originally Posted by eunos1800 (Post 326828)

What software is that please?

SolidWorks

I will post photos of the 3rd design tomorrow. Pretty cool! Nothing anyone has done before (here at least).
Stephanie

Is that CFD app part of Solidworks now, or an add-on?

Quote:

Originally Posted by Stephanie Turner (Post 326967)

I will post photos of the 3rd design tomorrow. Pretty cool! Nothing anyone has done before (here at least).
Stephanie

In for design pics!

Quote:

Originally Posted by Stephanie Turner (Post 326967)

I will post photos of the 3rd design tomorrow. Pretty cool! Nothing anyone has done before (here at least).
Stephanie

and mine? :cry:

Quote:

Originally Posted by Braineack (Post 326824)

seems like a taper will really help, i threw this together in about 10 minutes.

http://www.boostedmiata.com/projects...ervelocity.jpg

i need to redo it the more a real scale plenum, then i compare the pressure drop and flow through each.

Looks a lot like BracedEunos' manifold with longer runners.

https://www.miataturbo.net/forum/t27570/

Attachment 210201

that's what i was trying to model it after.

I do not currently have a CFD add in for solidworks. Does anyone know what happens if, instead of protruding stacks into the plentium, you just have a nice radius'ed flush mounted primaries?

What about a center inlet instead of end inlet? Put a 90 ontop of the plenum and put the TB facing forward?

My logic says that might even out the flow across the board..

Quote:

Originally Posted by TurboTim (Post 327156)

I do not currently have a CFD add in for solidworks. Does anyone know what happens if, instead of protruding stacks into the plentium, you just have a nice radius'ed flush mounted primaries?

My guess is that it will flow better.

Quote:

Originally Posted by Justin Olson

I agree that ideally it would be nice to have the stacks raised from the floor to get them out of the boundary layer.

I would be more concerned with the boundary layer separating in the diffuser section.

From what I had come across in my thermal/fluids coursework, everything to me suggested that flush velocity stacks would be the best way to go (from a flow standpoint). Since everybody had always been using raised stacks, I spent a bit of time doing some research and picking the brains of people who knew their stuff (other thermodynamic engineers with more experience). The only thing I really found suggesting a raised velocity stack was when the stack inlet radius was toroidal (meaning, not a constant radius). For a constant radius inlet, the stack was suggested to be flush against the floor. This was in an old ASME publication that a friend dug up for me. I've seen this topic touched on in fluids textbooks in the head/minor loss sections and usually it's just a chart showing flow loss 'K' coefficients for different entrances... and I've come across some text books that lead me to different conclusions about reentrant inlets.

On another note, what sort of flow conditions are you using for Cosmos?

in regards to this manifold design:

http://img68.imageshack.us/img68/7941/velocitycw7.png

Quote:

Originally Posted by elesjuan (Post 327158)

What about a center inlet instead of end inlet? Put a 90 ontop of the plenum and put the TB facing forward?

My logic says that might even out the flow across the board..

I've seen one like that on a hotside supercharged Miata made for that exact reason.

Well several intake manifolds come to mind directly, while others are setup differently..

My 2.3 Turbo manifold was a 2 part unit where the Plenum and the Runners were separated in two different castings. Common practice was to enlarge the lower manifold significantly and open up the upper plenum / rotate for ease of front mount location.

http://www.allfordmustangs.com/forum...bo-moter-2.jpg
http://www.allfordmustangs.com/forum...bo-motor-7.jpg

Old school SBC Carb manifolds and even early injection manifolds had a central inlet with a single or multiple planes.

Late model 5.0 Fords had a central inlet with a large plenum and long runners, along with the later model 4.6 liters.

Here is the 3rd design:

Looks interesting. If that is the model you guys go with...will the throttle linkage all bolt up somehow or will it use a new cable?