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Four stroke mufflers

Old 09-30-2003, 01:39 PM
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Default Four stroke mufflers

Just a quick general question, does a four stroke engine require a muffler to run properly? If i were to make a little longer straight pipe to get past the wing would i need to use the muffler at all? Is it just for sound controll on the FS motors? Im working with an FS-120 SC at the moment but thinking about four strokes in general. (this is a pumper motor so it does not require backpressure at the muffler to supply fuel)

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Old 10-01-2003, 09:44 AM
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Default RE: Four stroke mufflers

A mufler certainly isn't needed on the O.S. Max four-stroke engines. We've run countless engines with just the raw cylinder head, although we usually use the muffler to direct the exhaust stream.

Making a longer pipe usually won't hurt the engine unless it's too small and you get overheating from too much backpressure.

Running without any exhaust system at all will eventually erode away the threads in the cylinder head for the regular exhaust system.

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