john_p_b
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| posted on 29/10/06 at 02:24 PM |
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trumpets for webers
can they be bought with a mesh kinda filter in them?
just fitted my 40's and there's not really enough room to fit some nice shiny filters on so i got some socks for them but they look a bit
nasty to me. would love to just have nice shiny trumpets sticking out but don't fancy sucking in sparrows and such as i drive along.
cheers
built a car, built a home, had a family. lost the family, lost the home, still got the car.
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PaulBuz
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| posted on 29/10/06 at 02:27 PM |
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You will lose quite a bit of power by doing this.
a couple of months ago inPPC mag, they removed the mesh from some intake trumpets & gained 20+BHP!!
ATB
Paul
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john_p_b
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| posted on 29/10/06 at 02:43 PM |
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blimey! but surely running mesh in the trumpets is no worse than covering them with filter socks?
also whats the deal with different lengths etc?
gratefull as always for any education 
built a car, built a home, had a family. lost the family, lost the home, still got the car.
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MikeRJ
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| posted on 29/10/06 at 02:45 PM |
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The mesh is pointless. As said it impedes airflow significantly, but worse still it doesn't even filter properly. It will keep out small
boulders and stones, but the fine particles that are very abrasive to the engine pass straight through.
Socks aren't great generaly in terms of airflow compared to the larger filters, but they are a million times better than a silly bit of mesh.
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john_p_b
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| posted on 29/10/06 at 02:49 PM |
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ok mesh idea out the window then.
so......trumpet lengths ppl 
built a car, built a home, had a family. lost the family, lost the home, still got the car.
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DIY Si
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| posted on 29/10/06 at 03:20 PM |
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The length of the trumpet affects the rev band at which it gains most effect. Longer trumpets boost toqrue higher up the rev range. I think.
“Let your plans be dark and as impenetratable as night, and when you move, fall like a thunderbolt.”
Sun Tzu, The Art of War
My new blog: http://spritecave.blogspot.co.uk/
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MikeRJ
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| posted on 29/10/06 at 08:16 PM |
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As a rule of thumb longer=better for lower RPM.
This is why OEM injection system often have convoluted intake runners in order to fit the desired length into a smaller space, they are aiming for
low-mid range torque to give the best economy and driveability.
In summary, use the longest ones that will fit (which generaly isn't very long on a locost!)
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DIY Si
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| posted on 29/10/06 at 08:37 PM |
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Oppps wromg way round. Well, I was nearly there.
“Let your plans be dark and as impenetratable as night, and when you move, fall like a thunderbolt.”
Sun Tzu, The Art of War
My new blog: http://spritecave.blogspot.co.uk/
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john_p_b
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| posted on 29/10/06 at 09:03 PM |
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quote:
Originally posted by MikeRJ
As a rule of thumb longer=better for lower RPM.
In summary, use the longest ones that will fit (which generaly isn't very long on a locost!)
they sit about an inch above the chassis rail so length won't be a problem. time to get shopping i think!
thanks for the help.
built a car, built a home, had a family. lost the family, lost the home, still got the car.
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