TRX250R.ORG
FAQ's & Technical Articles => Techincal Section => Exhaust => Topic started by: rsss396 on July 10, 2013, 11:29:31 PM
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This pipe has a servo motor to adjust the tuned length of the pipe to match the rpms of the motor.
Longer pipe for low RPM's and shorter for high RPM's
http://www.youtube.com/watch?v=mvV4xbFKs0g&feature=relmfu
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That is cool. On the R maybe a trombone layout would work. Piston rings for sealing? Periodic cycling to keep the joints clean?
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I forget the details how they sealed it put I know it took a few differant designs to get one that worked that sealed without binding up.
Not much room on a trx for the typical style pipe to have a adjustable header but maybe something that had less movement could be done
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i theorized about a reed style pipe tuning that would have a similar result.
john
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will postup some pics of your ideas :)
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My dad used to run Karts, he ran a dual KT100 class. The pipes on it were a slipper design. Had a cable that came up to the steering wheel that you could pull on in the upper RPM range. The slipper portion was internal unlike the video. Pretty cool set-up.
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will postup some pics of your ideas :)
the ideas havent made it that far. its all in my head.lol
john
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That's why I wanted to reverse the cylinder to run the exhaust straight out the back. Had a similar idea as this. Even modeled it... LOL!
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How much change in length would it take to broaden the rpm range by 2000? For example what difference in length between a trx5 and trx7?
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My dad used to run Karts, he ran a dual KT100 class. The pipes on it were a slipper design. Had a cable that came up to the steering wheel that you could pull on in the upper RPM range. The slipper portion was internal unlike the video. Pretty cool set-up.
I drove a kneel down hydroplane boat like that. You would pull a lever on the straightaways and let go in the corners.
made a big difference in RPM. whole key was to remember when to pull and let go of lever.
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How much change in length would it take to broaden the rpm range by 2000? For example what difference in length between a trx5 and trx7?
about 300mm or around 11 3/4" for around a 2000rpm change
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Thats an awesome design. just need some one to build it. i watched it over and over again it was starting to remind me of and old girl friend ha ha ha ha ha ha ha [should of kept her]
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more adjustable exhaust header ideas
(http://www.deraceheldenvanweleer.nl/index.php?PHPSESSID=6tcsn45l1bn1pjt73gr8751ln6&action=dlattach;topic=1036.0;attach=28283;image) (http://www.microsofttranslator.com/bv.aspx?from=&to=en&a=http%3A%2F%2Fwww.deraceheldenvanweleer.nl%2Findex.php%3FPHPSESSID%3D6tcsn45l1bn1pjt73gr8751ln6%26action%3Ddlattach%3Btopic%3D1036.0%3Battach%3D28282%3Bimage)
(http://www.deraceheldenvanweleer.nl/index.php?PHPSESSID=6tcsn45l1bn1pjt73gr8751ln6&action=dlattach;topic=1036.0;attach=28285;image) (http://www.microsofttranslator.com/bv.aspx?from=&to=en&a=http%3A%2F%2Fwww.deraceheldenvanweleer.nl%2Findex.php%3FPHPSESSID%3D6tcsn45l1bn1pjt73gr8751ln6%26action%3Ddlattach%3Btopic%3D1036.0%3Battach%3D28284%3Bimage)
(http://www.deraceheldenvanweleer.nl/index.php?PHPSESSID=6tcsn45l1bn1pjt73gr8751ln6&action=dlattach;topic=1036.0;attach=28286;image)
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https://www.bukupower.com/Pipes.aspx
the cone inside this pushes back (lengthening the exhaust) as the exhaust pressure rises just like how a powervalve opens.
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https://www.bukupower.com/Pipes.aspx
the cone inside this pushes back (lengthening the exhaust) as the exhaust pressure rises just like how a powervalve opens.
this is very cool.
john
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Sounds backassward. Tuned length increases as rpms rise. High rpm pipes have a shorter tuned length than low rpm pipes.
I read a little farther and it does shorten it's tuned length after it lengthens.
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I liked how the video showed that little thing hitting 16,000 rpm....