big-vee-twin
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| posted on 1/1/12 at 06:53 PM |
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Trumpet Length Question
I have GSXR throttle bodies fitted to my Duratec, I also have two sets of rubber trumpets- two long, two short.
Suzuki use two short and two long on a bike.
What is the better combination for a fast road car Four long, Four short, or Two of each?
Many thanks
[Edited on 1/1/12 by big-vee-twin]
Duratec Engine is fitted, MS2 Extra V3 is assembled and tested, engine running, car now built. IVA passed 26/02/2016
http://www.triangleltd.com
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r1_pete
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| posted on 1/1/12 at 07:17 PM |
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Here's some trumpet design info:
 
Trumpets
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rusty nuts
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| posted on 1/1/12 at 08:09 PM |
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I suspect the only way to answer that question for sure would be a rolling road session trying each length of trumpet? What works on one engine may
not be the best for another
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whitestu
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| posted on 1/1/12 at 09:07 PM |
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I had a similar choice on the ZX9R carbs on my Zetec.
I haven't had it on a rolling road, but I can't tell the difference driving it with longer or shorter trumpets.
Stu
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paulf
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| posted on 1/1/12 at 09:52 PM |
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Trumpet length depends on what revs the engine develops maximum power, I looked into it and it seemed that for a zetec producing peak power at about
6000 revs the trumpets would need to be sticking out of the bonnet by about a foot so really the answer is the longer the better. I have trumpets
about 3 inches long and the main difference they made was that they stopped the smell of fuel at high revs when it tends to be thrown out of the inlet
at times.
Paul
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Rod Ends
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 posted on 2/1/12 at 12:03 AM |
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quote:
The one question I get asked more than any other from people buying throttle bodies is: “What length inlet trumpets do I need?”
My answer is always the same: “I don’t know”.
Emerald Adjustable Length Intake Trumpet Development
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big-vee-twin
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| posted on 2/1/12 at 08:45 AM |
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Many thanks Rod, that's a great write up, I understand a little better now.
I will try with the longer ones first.
Duratec Engine is fitted, MS2 Extra V3 is assembled and tested, engine running, car now built. IVA passed 26/02/2016
http://www.triangleltd.com
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