Originally posted by dvallis
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Das Beast: My E30 track / street build
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That looks great. Actual runner ID is 1.38" so your design is spot on. Metal thickness looks fine.
Could you add a throttle body inlet plate with 3 ID " tube? That's all it needs.
Nice inside details by the way. Looks like the real thing.
"And then we broke the car. Again." Mark Donohue, "The Unfair Advantage"
1987 E30 3L Turbo Stroker Das Beast
2002 E39 M5
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Well, THAT'S pretty weird. Here's a velocity plot. Cylinder #1 would be getting starved, not #6 Aaaaaannndddd ... that's why you need engineers designing manifolds. Yikes that's ugly. Glad we're using the stock manifold.
I gave it an intake volume goal of 1000 cfm, which is in the ballpark for this head. I know it's not exact but close enough. Note that volume of air OUT equals volume of air air IN. Also shows there is virtually nothing flowing in cylinder #1.
If you have Solidworks this is a pretty good CFD tutorial.Last edited by dvallis; 09-13-2019, 05:24 PM."And then we broke the car. Again." Mark Donohue, "The Unfair Advantage"
1987 E30 3L Turbo Stroker Das Beast
2002 E39 M5
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#1 got capped or the model won't run. But I'll check the port for extra material.
FYI you can't run a flow bench on the STEP file. It imports as a surface by default. I had to play with options, convert it to solids then add the runner flange and throttle body. I'll post the SLDPRT file today."And then we broke the car. Again." Mark Donohue, "The Unfair Advantage"
1987 E30 3L Turbo Stroker Das Beast
2002 E39 M5
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Just for curiosity sake I cranked the mesh resolution up to "Ya gotta be f..ing kidding me" and let the sim run this morning. I used a 20 core workstation that loved to have something better to do than email.
Nothing new but the you can definitely see more detail. Here's the velocity plot.
Flow plot.
Combined
I'm sticking a fork in this one and declaring the eBay manifold done. Waiting for the stock intake to come back from powder coating."And then we broke the car. Again." Mark Donohue, "The Unfair Advantage"
1987 E30 3L Turbo Stroker Das Beast
2002 E39 M5
- Likes 1
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Originally posted by dvallis View PostWell, THAT'S pretty weird. Here's a velocity plot. Cylinder #1 would be getting starved, not #6 Aaaaaannndddd ... that's why you need engineers designing manifolds. Yikes that's ugly. Glad we're using the stock manifold.
I gave it an intake volume goal of 1000 cfm, which is in the ballpark for this head. I know it's not exact but close enough. Note that volume of air OUT equals volume of air air IN. Also shows there is virtually nothing flowing in cylinder #1.
If you have Solidworks this is a pretty good CFD tutorial.
i never have all 6 moving air at the same time as it never happens in reality. also did you work out the mass flow and pressurize the inlet for something like 2b? if you have too high velocity on inlet it biases the flow to where the inlet points.
from the look of the design number 1 will be lower but i dont think it will be anywhere near as bad as this sugestsLast edited by digger; 09-14-2019, 02:59 PM.89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...
new build thread http://www.r3vlimited.com/board/showthread.php?t=317505
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#1 wasn't exactly zero, just some fraction of a CFM. I rounded to integer.
I gave the inlet an initial condition of 1000 CFM. Also tried some velocity initial conditions around 20 -100 m/s. Got the same results. I'll try a pressure.
The sim is working. I agree the CFM in #1 won't be zero, but definitely low. It's enough to give you a feel for the design, even if absolute velocities aren't what the real head will see."And then we broke the car. Again." Mark Donohue, "The Unfair Advantage"
1987 E30 3L Turbo Stroker Das Beast
2002 E39 M5
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