mr henderson
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| posted on 23/12/08 at 04:22 PM |
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2" = 50.8mm
1" = 25.4 mm
25.4 x 25.4 x 3.14 (pi r2) = 2025sq mm
150mm x 10mm = 1500 sq mm
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MikeRJ
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| posted on 23/12/08 at 04:45 PM |
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quote:
Originally posted by Mr Whippy
True but the area is so large that the gas flow would be quite slow
And that hurts performance as much as back pressure.
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edspurrier
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| posted on 23/12/08 at 06:15 PM |
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So a series of narrow cylindrical tubes with an ideal total diameter?
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907
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| posted on 23/12/08 at 08:34 PM |
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You would need five 1" pipes to equal a single 2" pipe. 
Paul G
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sebastiaan
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| posted on 23/12/08 at 09:06 PM |
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I think this is how westfield do their underslung system for the V8:
westy exhaust
a bit ride heigth critical, but not too difficult to knock up.
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edspurrier
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| posted on 23/12/08 at 09:42 PM |
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I was thinking more 20 pipes of 11.5mm dia to make a 2 inch up. So have 5 for each cylinder, perhaps, running to a frankly ridiculous collector at
the back. Heaven knows what the losses would be. Perhaps you could vary the diameters so each is harmonic for a different engine speed? Might make
an interesting noise, even if it did sap all the power away.
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The Black Flash
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| posted on 23/12/08 at 10:47 PM |
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Wait and see what happens I reckon...it's under appeal from all the manufacturers so I'm told.
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A1
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| posted on 23/12/08 at 11:05 PM |
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fingers crossed the manufacturers win!!!
toes too...
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NS Dev
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| posted on 23/12/08 at 11:30 PM |
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kart style sidepods?
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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C10CoryM
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| posted on 24/12/08 at 04:17 AM |
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Not sure if it helps, but the Donkeyvoort car use rear exit exhaust with covers over the sides.
Anyone have pictures of locosts with rear exit exhaust? I've decided to try and go that route myself as the engine Im using does not have a
nice exhaust note.
Cheers.
"Our watchword evermore shall be: The Maple Leaf Forever!"
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bilbo
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| posted on 24/12/08 at 09:25 AM |
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quote:
Originally posted by NS Dev
kart style sidepods?
This is what I'm currently thinking. I think I will continue down the traditional line of a side exhuast for now, then box it in like this if I
need to. (probably be cunningly designed to fall off on the way home from the test - unless it looks really good for some reason)
At least I've not got big headers to worry about, just a single pipe.
---------------------------------------
Build Diary: http://bills-locost.blogspot.com/
Web Site: http://locost.atspace.com
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ss1turbo
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| posted on 25/12/08 at 11:24 PM |
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quote:
Originally posted by 907
quote:
Originally posted by Mr Whippy
True but the area is so large that the gas flow would be quite slow
a simple calc and the area of a 2 inch pipe is about 19.5 cm sq compared to almost 8 times as much for just a 150mm wide 10mm thick flat pipe meaning
the gas is travelling around only 1/8th the speed inside so little in the way of drag…
[Edited on 23/12/08 by Mr Whippy]
I'm having trouble following your maths
Paul G
I think there's a zero gone missing somewhere...15cmx1cm = 15cm2 last time i used a calculator! A 200mmx10mm section would be about the same,
dependant on wall thicknesses!
Didn't a factory Westfield of some 90's vintage use twin 1.5" pipes underslung to get round clearance issues?
IIRC its the McLaren SLR which has the exhausts exiting in the front wings, so as not to disturb the flat floor..
Long live RWD...
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Simon
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| posted on 26/12/08 at 02:43 AM |
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Iirc the Viper exhausts are housed inside the sills - which I know we don't have, but they wouldn't be difficult to make from F/g or ally.
Would suggest wrapping the exhaust all the way down as Clarkson managed to get sill alight.
I think underslung the car would work only if provision was made from the build outset - I only have 5" clearance under the car!
When I was doing the turbos a friend suggested I run the exhausts straight from the turbo outlets and cut them flush with the side panel
ATB
Simon
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