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Lenghth of nitro pipe

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Lenghth of nitro pipe

Old 04-19-2006, 09:50 PM
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Default Lenghth of nitro pipe

I am running a 21 sized Prather deep vee with an OS 21 engine and a nitro pipe. Can you give me the approximate lenghth for the pipe? I know the distance is measured from the glow plug to the rise in the pipe. Also has anyone done any experimenting with quieting down nitro pipes? If you use a quiet pipe do you still have to cut the pipe to get maximum rpm from it?
Old 04-20-2006, 06:29 AM
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Ron Olson
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Default RE: Lenghth of nitro pipe

Start it at 8-1/2", that should get it close.
There are a lot of ways to quiet a loud unmuffled pipe from afermarket mufflers to home-made ones and no, you don't have to make any other changes afterwards except for the correct pipe length if I'm reading it right.
Old 04-20-2006, 08:08 AM
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Default RE: Lenghth of nitro pipe

Thanks Ron. Have you done any experimenting with using brass tubing that is the same ID as the outlet pipe ,placing it about 1/2 way into the tuned pipe to lower the noise level. I was talking with a boater from Grand Rapids that told me that this works but I haven,t tried it yet.He told me you could change the db level by sliding the tubing back and forth, just like playing a trombone.
Old 04-20-2006, 08:29 AM
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Default RE: Lenghth of nitro pipe

I've heard of that trick but haven't tried it. That is also supposed to be an IMPBA legal "muffler".
If it was from a boater in G.R., chances are pretty good that I know him and most of them are very smart.
Old 04-21-2006, 11:08 AM
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Default RE: Lenghth of nitro pipe

Mac's Products has a good start for finding the right length, here's the link to that page:

http://www.macspro.com/tuning.asp

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