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Old 07-05-2019, 07:21 PM   #1
allan980
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Running with no muffler


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I have a OS 91 surpass that I have removed the muffler for reasons not important right now
I am running with just the exhaust manifold and no tank pressure The engine performs great
My question is this going to hurt the engine with less back pressure or is their enough back pressure with just the exhaust manifold It does seem to have more power and is not much louder
Thanks Al
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Old 07-05-2019, 08:39 PM   #2
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Re: Running with no muffler

Quote:
Originally Posted by allan980 View Post
I have a OS 91 surpass that I have removed the muffler for reasons not important right now
I am running with just the exhaust manifold and no tank pressure The engine performs great
My question is this going to hurt the engine with less back pressure or is their enough back pressure with just the exhaust manifold It does seem to have more power and is not much louder
Thanks Al
You will not hurt the engine. Just take more care to set the needle a wee bit on the rich side, to make sure you dont run lean when pointing the nose of the aircraft up. Due to not having the assistance of muffler pressure to help feed the fuel to the carb.

Most early four strokes just had a small exhaust pipe and no muffler.
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Old 07-06-2019, 07:04 AM   #3
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Re: Running with no muffler

AJ is correct. Most early engines had nothing more than a pipe with the possibility of a nipple for pressure fitting and were still exceptionally quiet.

That is still the case even today. The OS Gemini 160 twin in the pic uses no mufflers, (also runs without vent pressure) and the prop is noisier than the exhaust.
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Old 07-06-2019, 11:25 AM   #4
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Re: Running with no muffler

Weren't mufflers optional at retail some time back? Was a big eye candy grab on the box "MUFFLER INCLUDED!"
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Old 07-06-2019, 06:43 PM   #5
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Re: Running with no muffler

Braze or silver solder a snort piece of brass tubing in the exhaust manifold and add one of those grey silicone extensions. Inside those cheap coffee makers that quit every three years are two sections of silicone tubing the right size and about seven inches long. Next time you throw out one of those coffee makers, take the bottom and remove the tubing.
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Old 07-06-2019, 07:44 PM   #6
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Re: Running with no muffler

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......Next time you throw out one of those coffee makers, take the bottom and remove the tubing.
Have not tossed out any tubing in last 10 or so years. A lot of differnent sizes get used for lots of things in my shop. Food grade and heat resistant. Good rubber isolators for exhaust supports.

I need some 3/4 for exhaust couplers
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Old 07-07-2019, 05:13 AM   #7
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Re: Running with no muffler

Thanks everyone I feel better now
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Old 07-07-2019, 08:57 AM   #8
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Re: Running with no muffler

The low noise level is limited to 4-strokes. 2-smoke and gas are pretty loud and almost unbearable if running sans muffler.

If you ever take apart a Keurig you would be surprised at the amount of useful bits that can be salvaged.
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Old 07-07-2019, 04:12 PM   #9
allan980
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Re: Running with no muffler

My OS 46AX with a Bisson Pits muffler makes more noise than the OS91 4 stroke
If you look at the 4Stroke muffler they are not really a muffler just a expansion chamber or does that open a new can of worms?
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Old 07-11-2019, 02:37 PM   #10
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Re: Running with no muffler

Fill your fuel tank 1/2 full to make your needle adjustments. When it nears low in the air you won't have to worry about being over lean.
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