Tuned pipe theory

Old 08-07-2013, 08:22 PM
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Default Tuned pipe theory

When buying a new pipe I usually base my choice on how far the stinger is from the start of the pipe.
Closer - more top end and vice versa.

This does not always work. I have included a diagram to try to explain what I mean.


Does anyone else have any other theories?
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Old 08-07-2013, 08:26 PM
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I think the diameter and length of the pipe as well as interior baffle have allot more to do with performance
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Old 08-07-2013, 09:18 PM
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Inner baffles, length, shape, diameter, and header all make a difference.
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Old 08-08-2013, 12:02 AM
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Take a deep dive in the knwoledge of 2-stroke engines like with the "Gordon Jennings 2-stroke tuning guide" and you will know the place of the stinger is not important.
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Old 08-08-2013, 06:46 AM
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Yeah, stinger position has almost no effect on the pipe. If you want to measure the effective length of your exhaust, you go to the widest part. Everything after that has no effect on length (which determines the pipe's rpm range) though can effect other attributes. Google that Gordon Jennings book. Somebody usually has it posted online for free somewhere and it has some really good info on pipe design.
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Old 08-08-2013, 07:22 AM
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As several has mention, Gordon Jennings is worth searching for, but also; Gordon Blair and Graham Bell wrote books that are great when you start down this path.
There are many others, but to begin these are good.
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Old 08-08-2013, 03:59 PM
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Thank you for all of the feedback. Found the book, now for a bit of light reading over the weekend.
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