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Tuned pipes....... who has theoretical or practical guidance in this area.

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Tuned pipes....... who has theoretical or practical guidance in this area.

Old 02-19-2005, 01:31 PM
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Quicksdraw MaGraw
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Default Tuned pipes....... who has theoretical or practical guidance in this area.

I would like to learn how to make a tuned pipe. The patient will be an AP.15. While I was breaking the engine in I noticed that it was very sensitive to exhuast extensions. Maybe I'm right maybe I'm wrong but this leads me to believe that some gains may be hiden here. I have done just a little searching and haven't found much. Anyone want to step up?
Old 02-19-2005, 03:25 PM
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pe reivers
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Default RE: Tuned pipes....... who has theoretical or practical guidance in this area.

Martin Hepperle has a Java pipe simulator on his web pages. http://www.mh-aerotools.de/airfoils/
Old 02-19-2005, 05:04 PM
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Default RE: Tuned pipes....... who has theoretical or practical guidance in this area.

An excellent resource. Thanks much!
Old 02-19-2005, 05:39 PM
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Default RE: Tuned pipes....... who has theoretical or practical guidance in this area.

If you can find a book titled "The Two Stroke Tuners Handbook" by Gordon Jennings there is an amazing amount of information included. I knew Mr. Jennings from my old motorcycle racing days and his knowledge was legendary. This is mainly for motorcycle engines but the theories and formulas work for our applications. I found the book on the web in .pdf format at http://www.chuckbunnell.com/kart/jennings/jennings.html. Not the best appearing but readable.

mike
Old 02-19-2005, 07:45 PM
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Default RE: Tuned pipes....... who has theoretical or practical guidance in this area.

Another great book can be bought from the SAE. It was written by Gordon Blair and is titled The Design and Simulation of Two-Stroke Engines. This book is the definitive text on how to design two-stroke engines and exhaust systems.
I have to ask, why are you interested in designing and building your own tuned pipe when you can buy a very effective one from Macs? Do you intend to make it from composite? Or are you skilled at welding aluminum?
Old 02-20-2005, 12:47 AM
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Default RE: Tuned pipes....... who has theoretical or practical guidance in this area.


This site might interest you. http://www.bmaps.net/info/pipes.html
Old 02-20-2005, 09:17 AM
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Default RE: Tuned pipes....... who has theoretical or practical guidance in this area.

Mike,
Thanks very much for posting the link to a copy of Gordon Jennigs's book.
Having a copy of Ricardo's and Blairs work, Jennings's extremely practial approach now completes the lot.

Do you know a link to the blair programs? They were not included in the book (bought from Amazon).
Old 02-20-2005, 01:56 PM
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Default RE: Tuned pipes....... who has theoretical or practical guidance in this area.

the link to the jennings book don't work no more...any chance one of you could email it to me?

[email protected]

dave
Old 02-20-2005, 03:20 PM
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Default RE: Tuned pipes....... who has theoretical or practical guidance in this area.

Gordon Blair's software is rather old and clunky - it was written back when Win 3.1 was the operating system of choice. TSR Racing ( http://www.tsrsoftware.com/index_2.html ) sells much better software that is based on Gordon Blair's work.

I couldn't find Gordon Jenning's book at the link given above either.
Old 02-20-2005, 04:00 PM
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pe reivers
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Default RE: Tuned pipes....... who has theoretical or practical guidance in this area.

The link ends in a dot! when removed, it opens OK.
I know the TSR web pages. They sell even the simplest formulae that most of us would provide for free.
Example, The cone volume calculator for $39 ??
Old 02-20-2005, 04:34 PM
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Default RE: Tuned pipes....... who has theoretical or practical guidance in this area.

thanks Pe, i didn't catch that

Mike, give yourself 12 lashes with a nyrod for using proper punctuation


dave
Old 02-20-2005, 08:44 PM
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Default RE: Tuned pipes....... who has theoretical or practical guidance in this area.

Completed - used 0.070 CF rod that I had in stock.

mike
Old 02-20-2005, 10:19 PM
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Default RE: Tuned pipes....... who has theoretical or practical guidance in this area.

Preivers, I didn't say one should buy ALL of TSR's software

But if you do purchase any of it you will discover that it is a lot easier to use than what Gordon Blair initially published. Tom Turner over at TSR has developed an easy to use integrated package aimed at the professional motorcycle/snowmobile/personal watercraft tuner's market and it is priced accordingly.

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