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tsbb1
Occasional Poster


Location:
North Qld
Registered:
March 2003
Trumpets ?? Thu, 03 June 2004 04:43 Go to next message
Guys your ten cents worth please Ok its a 20 valve being used for offroad use... the box that the trumpets live in is retained and the air is feed through a hole in the top of this box Question is will l get more hp or less if l remove the plastic trumpets... the air senser is fitted to the back of the box l have photos of the setup but where do l post them ???
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Ben Wilson
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Canberra
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May 2002
Re: Trumpets ?? Thu, 03 June 2004 04:55 Go to previous messageGo to next message
The trumpets are there to maintain a tuned inlet length, ditching them and going for something shorter like this:

http://www.ben.foo.cc/Trumpets.jpg

Can help, but, only if you get suitible cams/management to go with them.

I'd suggest leaving them as they are to start with.
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tsbb1
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North Qld
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March 2003
Re: Trumpets ?? Thu, 03 June 2004 04:58 Go to previous messageGo to next message
Ben can l send you the photos it might explain it better
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Ben Wilson
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Re: Trumpets ?? Thu, 03 June 2004 05:02 Go to previous messageGo to next message
Check your mail.
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AE86slut
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Location:
Baulko Hillo
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April 2004
Re: Trumpets ?? Thu, 03 June 2004 05:09 Go to previous messageGo to next message
Hey Trevor,

I was speaking to a person the other day about this, and he has done dyno runs with both the standard trumpets and then with ones like mine (on the engine in my avatar). He said there was a noticable gain in torque when using the standard ones most likely due to extra length. The spun ones are better for top end power.
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tsbb1
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Location:
North Qld
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March 2003
Re: Trumpets ?? Thu, 03 June 2004 05:25 Go to previous messageGo to next message
Yea ok but what if i remove them just have a air box ???
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AE86slut
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Location:
Baulko Hillo
Registered:
April 2004
Re: Trumpets ?? Thu, 03 June 2004 05:33 Go to previous messageGo to next message
Well, I'm taking a guess here, but as you would be reducing the intake runner length even more, this would result in even less torque.

Oh, by the way, I'll be checking that belt out and let you know on Sunday by the latest. Sorry man, just super busy!

Cheers,

Jeremy.
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rob_RA40
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Location:
c'town, NSW
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May 2002
Re: Trumpets ?? Thu, 03 June 2004 06:06 Go to previous messageGo to next message
also no bellmouth will create more turbulence in the air entering the ports.
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oldcorollas
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
 
Re: Trumpets ?? Thu, 03 June 2004 06:33 Go to previous messageGo to next message
exactly.. the whole point of a bellmouth is because most air gets pulled in from the sides of the runner opening.. by havign a trumpet, you increase the diameter of the opening, so you effectively have more area for the air to enter the runner. in fact a lot of air actually gets pulled in from "behind" the trumpet, so it's important to have the curve continuing over and folding back around to the trumpet again...


not having trumpets means you just have a hole.. and that is not very good as far as air entering the runners goes.. you will lose both velocity and resonance tuning, which is what makes the 20V good in the first place..

i think Bens trumpets look the goods

[Updated on: Thu, 03 June 2004 06:34]

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AE86slut
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Location:
Baulko Hillo
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April 2004
Re: Trumpets ?? Thu, 03 June 2004 06:57 Go to previous messageGo to next message
Who's Ben? What do his trumpets look like? I'm interested to try a few different designs.....

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RobertoX
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Location:
Adelaide
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May 2002
Re: Trumpets ?? Thu, 03 June 2004 07:00 Go to previous messageGo to next message
I think he's talking about the 2nd post on this thread... Razz
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AE86slut
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Location:
Baulko Hillo
Registered:
April 2004
Re: Trumpets ?? Thu, 03 June 2004 07:02 Go to previous message
Hmmm..... Yep, I think you may be right Embarassed Very Happy
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