Author Topic: Muffler mods  (Read 2007 times)

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Offline Cut4fun

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I just noticed this was about spark screens. If there is a muffler mod thread let me know and I'll move Brian's info if needed. Might be some screen stuff thrown in later.  :-\

Brian did some testing on a 026 back in 2007.

Quote from: timberwolf;605833
I did a little testing on opening up a muffler on an 026, this was posted about the web, but did not generate too much interest, though maybe it could be helpful.

Basicaly what I did was weld up a blank muffler cover for an 026 with a front plate that could be easily modified with different opening sizes.

Each time I tried a new opening the saw was tuned by ear to the edge of 2 stroking and then I made several cuts in a 10 inch poplar taking the best time.

Saw is bone stock except for a improved 260 air filter.

What I found was from a stock opening to 120% of the exhaust port size there was about a 20% improvement in cut times. Going further up to 400% of the port area continues to give small gains totaling another 5%.

I did also find that maintaining a good idle became problematic over 190% of the port area.

Here are a few pics and graphs








 

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