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What would happen if I.........

Old 04-29-2016, 07:29 PM
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aircraftbuilder67
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Default What would happen if I.........

Being the curious type, I am wondering what would happen if I removed the baffle from the muffler of a glow engine. I was replacing a dried out O-ring on my OS 95V four stroke's muffler and was half tempted to see how engine performance would be affected without putting the baffle back in. Less back pressure, more power? More noise? Less power? Sooner or later, I'll see what happens, but in the mean time, anyone try that to see what happens?
Old 04-30-2016, 06:32 AM
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wcmorrison
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I have removed the internal baffle in OS two cycle applications. I have modified one in a Saito as it was impossible to get out. I think it was pressed in place. So I bored out the holes a bit. Frankly I did not note any difference in performance. That was in a Saito .91. The other Saitos I have are smaller in size, and the mufflers appear to be all one piece with no inserts/baffles installed. I have also used Turbo Mufflers, sound a bit different and I am sure there is not hardly any internal baffling installed, very small area to be installing a baffle. The Turbo muffler did give more RPMs.
Old 05-04-2016, 07:00 AM
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Typically on a 2stroke engine you'll see a power increase if you're talking about the stock muffler. Of course, noise also then increases most times as well.
Old 05-05-2016, 05:22 PM
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aircraftbuilder67
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Thanks for the replies. After flying this weekend, I am less curious....... only because I had plenty of power in the planes I was flying (if that's possible). The first was an OS .55 AX. With a 12.25 x 3.37 prop, it was twisting enough RPMs that the prop tips were going supersonic. I figured that was enough noise and I didn't want to upset any of the neighbors.

With the .95 V, I again had all the power I needed........ plus I burned the living daylights out of a couple of fingers when I stupidly grabbed the muffler (shortly after engine shutdown). At some point, curiosity will strike again and I'll follow through and take out the baffles. In the meantime, blue skys and soft landings.
Old 05-10-2016, 03:10 PM
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geeter
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You'll usually gain some rpm by taking the baffel out. A little noise but not a biggie. I do it all the time.

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