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Old 08-31-2013, 09:19 AM   #1
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Performance muffler and recommended RPM range.

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I recently purchased an Evolution performance muffler for my .45 Evo TPS muffler. After installing it, I gained about 1100-1300 RPM with an 11x6 prop. This brought me up to a max ground rpm of around 13700. The instruction slip for the muffler notes that the muffler should not be used unless ground rpms peak out above 15000. I slapped on a 10x7 and achieved a max ground rpm of about 15200.

My question is, would it really be damaging to my engine to use the muffler with the 11x6 prop? I have seen lots of threads throughout the internet documenting the use of the Tower bolt on mufflers with similar rpm gains (the tower muffler looks very similar to the Evo muffler), and many people have been using their Tower mufflers at less than 15000 RPM. I wouldn't mind the extra rpms from the muffler and the stronger thrust from the 11x6 prop...

Evo muffler:

Evo muffler user manual:

Tower Muffler:
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Old 09-02-2013, 09:15 AM   #2
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Re: Performance muffler and recommended RPM range.

Cheap engines and good quality are two things that do not go together! Running that engine at that rpm on modern fuels with low oil content will definitely shorten it's life by a long way. look for a black deposit in your exhaust oil, that is the inside of your engine coming out. 11X6 is the proper prop for that engine. If you want more power put a bigger engine in it. Buy a quality engine not cheap junk. I add 150 ml of de-gummed castor oil to my fuel. That brings the oil content up to 18%. The bottom line is do not run that engine that fast!!!!!!

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