Author Topic: Dual Port Muffler Experiments  (Read 314 times)

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Offline KilliansRedLeo

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Re: Dual Port Muffler Experiments
« Reply #20 on: May 26, 2014, 02:53:47 pm »
So, I removed 0.250 from the 4.25 inch long pipe, high revs still @10.5K when it begins to four stroke so it appears that the additional length wasn't doing anything. I have 0.250 of pipe left that I can remove before reaching the design dimensions. I plan to do this in 0.125 increments with the saw actually cutting wood, and see where we are at.
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Offline 460cixy

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Re: Dual Port Muffler Experiments
« Reply #21 on: October 18, 2014, 06:23:34 am »
Hi there. How did this end up working out? I have one of these and I'm keen to warm it up

Offline 3000 FPS

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Re: Dual Port Muffler Experiments
« Reply #22 on: October 21, 2014, 11:43:42 pm »
I have done a few muffler mods with pipes and by making slits or making a small box for the outlet.   They all seem to perform the same to me.   
As far as tune pipes are concerned you will never get a box muffler to come close to a tune pipe.   For a tune pipe to work you have to have the correct length, shape and size to take advantage of the harmonic waves that are created at the exhaust.   A box muffler cannot perform this in any way shape or form by just changing the outlet.
PP 505, 475, 445.

Offline 660magnum

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Re: Dual Port Muffler Experiments
« Reply #23 on: October 22, 2014, 12:13:06 am »
Here's member Al Smith using my 372 with a mild wood's porting and a pipe that made a considerable difference in power but it is not practical for the woods.

https://www.youtube.com/watch?v=SHwzPJfwdh8

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Offline 3000 FPS

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Re: Dual Port Muffler Experiments
« Reply #24 on: October 22, 2014, 08:38:44 pm »
The tuned pipe on that 372 is like super charging on a 2 stroke.   I'll bet it made a huge difference.
PP 505, 475, 445.

 

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