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04-11-2005, 11:14 AM
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#1
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I am Spartacus
Join Date: 01-07-2002
Location: North by Northwest
Posts: 2,087
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Simple inlet air flow analysis
I think some of the more geeky members (I know I'm not the only one  ), might find this interesting.
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The only thing in the world that’s worse that a fake Rolex is a real one
Last edited by Ben Wilson; 10-11-2006 at 08:09 AM.
Reason: They moved their forum..
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04-11-2005, 11:22 AM
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#2
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Vroom!!!
Join Date: 28-04-2003
Location: In the ghettoooooo...
Posts: 6,287
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You said simple...
T.
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04-11-2005, 11:25 AM
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#3
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I am Spartacus
Join Date: 01-07-2002
Location: North by Northwest
Posts: 2,087
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Quote:
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Originally Posted by Bogan
You said simple...
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That is the simple bit, once you start tuning the inlet for inlet harmonics and helmholtz resonance inside the airbox, things start to get weird/cool ...
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The only thing in the world that’s worse that a fake Rolex is a real one
Last edited by Ben Wilson; 04-11-2005 at 11:30 AM.
Reason: Edited just to make Tony's brain hurt....
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04-11-2005, 11:27 AM
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#4
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Take the blue pill.
Join Date: 02-12-2001
Location: according to my wife, somewhere up my own ****.
Posts: 2,808
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That was a bloody good read. Thanks Ben!
I'd just like to point out that I am not a geek.
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Ministry of Boost
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04-11-2005, 11:36 AM
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#5
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Banned.
Join Date: 03-12-2001
Location: Canberra.
Posts: 6,235
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Ditto.
Thanks Ben... certainly gives me a little more to think about with my "airbox" design. Don't suppose you've got CFD capabilities in the lab, Frinkmeister?
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04-11-2005, 11:39 AM
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#6
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I am Spartacus
Join Date: 01-07-2002
Location: North by Northwest
Posts: 2,087
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Quote:
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Originally Posted by fro
Ditto.
Thanks Ben... certainly gives me a little more to think about with my "airbox" design. Don't suppose you've got CFD capabilities in the lab, Frinkmeister?
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I can get a large box of coloured crayons you can borrow if you want 
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The only thing in the world that’s worse that a fake Rolex is a real one
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04-11-2005, 11:49 AM
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#7
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Banned.
Join Date: 03-12-2001
Location: Canberra.
Posts: 6,235
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Quote:
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Originally Posted by Ben Wilson
I can get a large box of coloured crayons you can borrow if you want |
Ummm, I've already got my own set of Non-Computational Fluid Dynamics tools... I was hoping for somethign with a little more scientific rigour, but thanks anyway... |
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04-11-2005, 11:54 AM
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#8
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I am Spartacus
Join Date: 01-07-2002
Location: North by Northwest
Posts: 2,087
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One thing to bear in mind is that the 18% improvement ws only for the trumpet itself.
If a trumpet without the plate already flows as much air as your engine needs, you're not going to see much of a difference.
This is where you need somebody with a flowbench......
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The only thing in the world that’s worse that a fake Rolex is a real one
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04-11-2005, 12:06 PM
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#9
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Registered User
Join Date: 22-08-2005
Posts: 1,652
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Quote:
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Originally Posted by Ben Wilson
I can get a large box of coloured crayons you can borrow if you want |
I've got some highliters.  |
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04-11-2005, 12:23 PM
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#10
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2006 NSW P6 Champeeen
Join Date: 03-12-2001
Location: Out there.. Way Out... Port Side
Posts: 2,359
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And Fro, you already know someone with a flow bench.....
All be it a little 12th century.....
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04-11-2005, 12:35 PM
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#11
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Registered User
Join Date: 22-08-2005
Posts: 1,652
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And a vacuum cleaner.
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04-11-2005, 01:09 PM
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#12
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prefers skidmarks to be black
Join Date: 09-07-2002
Location: Canberra
Posts: 279
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Pretty colours!
It gels well with David Vizards old work on no nothing vs straight pipe vs bell mouthed trumpet design.
I think it went... (snipped from an old post on anothor forum or two)... the variation in power over a carb with no ram tube can be a loss of 6.7% for a bad tube to a gain of 5.8% for a good one. Generally, a stock weber ram tube is pretty good, gaining around 5% over not having a tube at all.
I then made some rash baseless statement like...
In a car as suceptible to air flow problems as a big gulping rotor, the results could be even more pronounced as air velocity gets very high.
I don't have the book handy buy I dont recall if vizard tested the flat around the trumpt lip.
I do know that Lynx used to make a IDA weber filter assembly that fitted over the trumpet like the flat surface depicted and would be a "cheap" way of achieving a like result. If you can find one these days...
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04-11-2005, 02:27 PM
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#13
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Need EFI? Get Megasquirt.
Join Date: 03-12-2001
Location: Deep south.
Posts: 5,728
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Cool. That dude needs to get the same tool on to modelling air flow in a restrictor.
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Marc Kelly
Now with MS'd JD Camira rally car. Don't laugh.
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04-11-2005, 03:07 PM
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#14
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2007 VRC P3 Champion
Join Date: 03-12-2001
Location: Melbourne
Posts: 1,256
Rep Power: 10 
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Interesting read. It's appears to be very similar (but in reverse) of modern audio speaker design.. with the whole flush mounting more effective, and tappered vents etc.
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04-11-2005, 03:27 PM
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#15
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I am Spartacus
Join Date: 01-07-2002
Location: North by Northwest
Posts: 2,087
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The trumpets on Boss Hair's Trueno started off life as subwoofer ports...
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The only thing in the world that’s worse that a fake Rolex is a real one
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