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Bellengineering - Miata Accessories Ordering and General Information Stephanie Turner 830-438-2890 ext. 103 [email protected]

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Old 11-03-2008, 05:13 PM   #101
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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.
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Old 11-03-2008, 05:21 PM   #102
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What software is that please?
SolidWorks
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Old 11-03-2008, 05:34 PM   #103
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Thanks
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Old 11-03-2008, 08:37 PM   #104
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Very interesting...
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Old 11-03-2008, 10:54 PM   #105
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I will post photos of the 3rd design tomorrow. Pretty cool! Nothing anyone has done before (here at least).
Stephanie
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Old 11-03-2008, 11:15 PM   #106
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Is that CFD app part of Solidworks now, or an add-on?
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Old 11-04-2008, 08:41 AM   #107
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add on
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Old 11-04-2008, 10:03 AM   #108
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Quote:
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I will post photos of the 3rd design tomorrow. Pretty cool! Nothing anyone has done before (here at least).
Stephanie
In for design pics!
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Old 11-04-2008, 10:30 AM   #109
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Originally Posted by Stephanie Turner View Post
I will post photos of the 3rd design tomorrow. Pretty cool! Nothing anyone has done before (here at least).
Stephanie
and mine?
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Old 11-04-2008, 11:56 AM   #110
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seems like a taper will really help, i threw this together in about 10 minutes.




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/

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Old 11-04-2008, 11:57 AM   #111
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that's what i was trying to model it after.
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Old 11-04-2008, 12:11 PM   #112
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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?
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Old 11-04-2008, 12:13 PM   #113
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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..
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Old 11-04-2008, 12:28 PM   #114
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Quote:
Originally Posted by TurboTim View Post
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.
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Old 11-04-2008, 01:31 PM   #115
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Quote:
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:

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Old 11-04-2008, 01:36 PM   #116
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Quote:
Originally Posted by elesjuan View Post
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.
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Old 11-04-2008, 04:59 PM   #117
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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.




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.
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Old 11-04-2008, 05:06 PM   #118
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Here is the 3rd design:
Attached Thumbnails
Begi Intake Manifold-p9304633.jpg   Begi Intake Manifold-p9304634.jpg   Begi Intake Manifold-p9304635.jpg   Begi Intake Manifold-p9304636.jpg  
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Old 11-04-2008, 05:18 PM   #119
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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?
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Old 11-04-2008, 05:19 PM   #120
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interesting....
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