skwerl
Will Climb for food
TW, you say the saw is 7% less efficient since modding. Will you return it to stock in order to regain your lost efficiency?
timberwolf said:I did not gut the muffler, just extended the openings back into the rear part, I left the pipe in, it looked to be too much of a pain to cleanly remove without cuting the muffler in two and rewelding, I went with 2 3/4 pipes with a 5/8 inch inside diamiter each. Spent a lot of time deburring and geting all the metal shavings out.
I guess my approach was a bit different than many who gut the muffler and put a centered hole in the front of the cover. I an not saying it is any better or worse in any way, just going on a hunch of how gas moves in the muffler and the impact it has on scavanging. I may test it some time on a 2 piece muffler that is easier to deal with.
Those are certanly some impressive #s . For a 59cc engine two 5/8" exits must equate to at or near 100% of the exhaust port at the cylinder. I recently did a mod on a MS310 muffler for a friend, 59cc same as what you got there & the 361. Only went with 2 -1/2" exits looks like could have gone a lot more. Have you had a chance to check the pop off pressure ? I beleive you were one of the few on that thread that was going to look into it.Here is a shot of the muffler, no nice paint job yet.
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