artie__bc said:Please help a newbie here! When you're talking about the 80-85% rule does this refer to the TOTAL area of the muffler ports, or just the ADDITIONAL area of the ports you're going to add?
artie
Urbicide said:Hey Josh, he did say "Please."
artie__bc said:Four Paws on one post you said the new hole should be 80 - 85% and on another you said combined SA of all holes. Just wanted some clarification before I start hacking at my muffler! Anyways, my 044's muffler already has a hole that equals about 80% of the cylinder port SA, so maybe I won't gain anything with a muffler mod? Has anyone here done an 044?
artie__bc said:Four Paws on one post you said the new hole should be 80 - 85% and on another you said combined SA of all holes. Just wanted some clarification before I start hacking at my muffler! Anyways, my 044's muffler already has a hole that equals about 80% of the cylinder port SA, so maybe I won't gain anything with a muffler mod? Has anyone here done an 044?
rbtree said:I disagree that 80-85% is optimal, as measured against the port at the cylinder wall. Ken Dunn, venerable saw builder, used 125-150% as his baseline.
most of my saws are probably at 100-125%, but have also been woods ported, which may allow for more opening. One, was muffler ported by Ed Heard way too much. It's a 346, and is very fast, but way too loud. Definitely no power fall off from too much port area. I do need to quiet it down though!!
Freakingstang said:....
Keep in mind, that you should put a spark screen in the new hole. This will also affect airflow up to 50% depending on the screen size. So sometimes the hole has to be bigger than one would think with a screen in place to get the best gains.
artie__bc said:Yeah Andy, I saw the thread on your 361 mod, and I've got the parts to do it to my 044. I also have a big bore cylinder kit for it, so maybe it'll benefit more from a little better flow than a stock cyl. I guess if it doesn't work out it won't be too hard to weld the hole shut again.
As far as whether it's an old or new 044, it's late 90's; does that make it old or new? It has the 12mm wrist pin.
Cheers, artie
artie__bc said:Yeah, this muffler is just a tin box with an inlet and outlet, no baffles or anything. Just a spark screen on the outlet. I've been considering, and I think the easiest thing would be to enlarge the outlet a bit. There's a lot of room to do that.
artie__bc said:Do you have a part# Andy? My IPL hasn't come yet.
musch said:Does anyone have photos of a MS260 muffler mod?
And yes, I did search the archives....opcorn:
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