Author Topic: Did I go a little too far with my 260 exhaust mod?  (Read 517 times)

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Offline H 2 H

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Re: Did I go a little too far with my 260 exhaust mod?
« Reply #10 on: November 05, 2013, 05:30:46 pm »
Every saw I own I have atleast one extra muffler even my MS 261 and MS 461

Make sure you have good working carbs to adjust to the new muffler also
"People ask me where all my money went, I tell them half of it I spent on gambling, fast women and liquor, the other half I wasted!" W.C.

"..... nothing more funnier than watching some ole coot make a fool out of himself, especially sideways”

"You can't argue with someone that doesn't have any real life experience on the subject."

Offline HolmenTree

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Re: Did I go a little too far with my 260 exhaust mod?
« Reply #11 on: November 05, 2013, 07:04:06 pm »
Well I don't do saw repair or mods for other folk, but I can say I have boxes of useless dirty old saw parts up in my attic that need to be recycled. :)
Making a living with a saw since age 16.

Offline Old Iron Logging

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Re: Did I go a little too far with my 260 exhaust mod?
« Reply #12 on: November 05, 2013, 07:51:29 pm »
Timberwolf did some work with large exhaust openings. Some worked very well. My 026 was large, no pics. This 675 had the largest opening on any saws that I got from him.
https://www.youtube.com/watch?v=vh5GBZgcrMw

Offline Gregsl

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Re: Did I go a little too far with my 260 exhaust mod?
« Reply #13 on: November 05, 2013, 08:46:50 pm »
Lol HolmenTree. If you have a spare 260 muffler in that dusty box of parts you should send it out east. I'm in NS.

Offline Al Smith

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Re: Did I go a little too far with my 260 exhaust mod?
« Reply #14 on: November 05, 2013, 09:24:01 pm »
Once upon a time there was an arborist in Cincinati who posted on another site who's name I won't mention .

He got the bright idea to hog the muffler out on a nearly new Stihl 880 or 088 he was real proud of but neglected to increase the high speed jet .I nearly pleaded with him to make some provisions which fell upon deaf ears .Sure enough a month or two later on flea bay for sale a Stihl 088 ,cooked cylinder .

Offline HolmenTree

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Re: Did I go a little too far with my 260 exhaust mod?
« Reply #15 on: November 05, 2013, 10:32:29 pm »
Lol HolmenTree. If you have a spare 260 muffler in that dusty box of parts you should send it out east. I'm in NS.
Hello Gregs, no 026/260 parts,
Making a living with a saw since age 16.

Offline Gregsl

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Re: Did I go a little too far with my 260 exhaust mod?
« Reply #16 on: November 06, 2013, 08:58:00 am »
LOL, no worries HolmenTree

I almost have the saw completely torn down with all parts inspected and labelled in ziplocks. I am awaiting my meteor piston kit and gasket set from Baileys so I have some time to research some of the unknowns with this rebuild.  Thanks to this site (and other sites)  the unkowns become less each day.

Next step, fabricating my homemade case splitter and flywheel puller... Then a thorough degreasing of all parts.

G


Offline HolmenTree

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Re: Did I go a little too far with my 260 exhaust mod?
« Reply #17 on: November 06, 2013, 11:04:15 am »
I have a 5 gal parts washer that I keep outdoors by the front door of my workshop. I mounted it inside a stripped out barbeque, the lid of the barbeque keeps the parts washer and solvent protected from the elements and it's sitting waist high for easy use.
Making a living with a saw since age 16.

Offline Adirondackstihl

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Re: Did I go a little too far with my 260 exhaust mod?
« Reply #18 on: November 06, 2013, 07:42:15 pm »
homemade case splitter and flywheel puller...

Case splitter = brass hammer

flywheel puller = $8 from STIHL

Offline Gregsl

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Re: Did I go a little too far with my 260 exhaust mod?
« Reply #19 on: November 08, 2013, 09:44:56 am »
So i stole an idea from someone else and used Sketchup to calculate the area of all the openings.

Anyways.  The black rectangle represents the "ideal" opening of the exhaust and is based on the commonly accepted 80% of the exhaust outlet (outside-cylinder) and ~150% of the exhaust outlet (in-cylinder) rule of thumb

As you can see with my existing modified exhaust hole, i can almost double the size and be within the rule of thumb specs.  I think i will try it 'as is' and see how it goes and then open it up further based on those results.

There was an interesting post on another site where a guy did 5 successive exhaust mods on a 260 and analyzed the results in terms of engine/exhaust temp and sound level. He started with the muffler that had the single 1/4 inch hole and then opened it up sequentially to be a 1.5 inch x 3/8 rectangle... which is basically the same dimensions of the "ideal" rectangle in my pic.

G

 

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