Stock mufflers

[TJ the Chainsaw Mechanic]

Ear muffs are over rated.....give it enough time and your ears will muffle themselves.

 

[merc_man]

Ear muffs are over rated.....give it enough time and your ears will muffle themselves.

I ran the 026 muff modded for like five mins and my ears were ringng for an hour after.

 

[jmssaws]

Does this qualify for a stock muffler? Lol

 

[merc_man]

Just curious has anyone ever done a timed cut before muf mod and after to see how much you accually gain.

 

[jmssaws]

Just curious has anyone ever done a timed cut before muf mod and after to see how much you accually gain.

I have and on a ported saw the bigger the more it gains. That's why the saws I own are very loud.
Stock saws I'm not sure but it's probably the same

 

[TJ the Chainsaw Mechanic]

I ran the 026 muff modded for like five mins and my ears were ringng for an hour after.

I hear ya! After muffler modding my homelite I Have to wear ear muffs or my ears will ring loud enough for others to hear! lol

 

[Moparmyway]

Wide open loaded is between 9200 and 10 k depending in how hard i push the handlebars ,the sweet spot for smooth boards seems to be 7200 ,when i piss revved the saw no load and shut it off tach said 12900 ,i had to lean the carb after took the dual cover off it lost almost 1000 rpm doing that ,has stock baffle box inside and little factory opening now ,sounds like a sewing machine,still has plenty of power also for milling

Makes sense, I've swapped a modded muffler for a stock one on a few of my saws, they definitely slowed down with the stock muffler, they are much quieter, and needed to be leaned. The needing less fuel means they were using less air. Less fuel and less air is less power

I have and on a ported saw the bigger the more it gains. That's why the saws I own are very loud.

Absolutely agree 1000%

 

[junkman]

Just curious has anyone ever done a timed cut before muf mod and after to see how much you accually gain.

When @Mastermind did his first 661 thread ,on the stock saw i do not believe he got any gains on that particular saw opening up the muffler except noise ,timed cuts were real close .

 

[junkman]

Makes sense, I've swapped a modded muffler for a stock one on a few of my saws, they definitely slowed down with the stock muffler, they are much quieter, and needed to be leaned. The needing less fuel means they were using less air. Less fuel and less air is less power


Absolutely agree 1000%

Not to start an oil thread here ,but i tried this once before and the paint burned off the muffler cover right away running one of the bike oils at 32 to 1 so i put the dual port cover back on to let some heat out ,the saber 40 to 1 the paint still is all on the stock cover after 3 or so hours on the hour meter totally choked up muffler .

 

[jmssaws]

To me it's not about a gain it's about getting the heat away.

 

[merc_man]

To me it's not about a gain it's about getting the heat away.

Good point i forgot aboit that lol

 

[jmssaws]

Good point i forgot aboit that lol

Hard to say how many 660's got killed by the tiny muffler outlet.

Heat is the enemy and anything that can be done to get rid of it should be done.

 

[merc_man]

Whatbdo you guys use to getbthe baffle out. Only way i can is a hammer and small chissle. Anybothe ways to do it. Been wanting to do my exho 520 for a whilr and this thread inspired me to donot now. Well at least start it. Gotta get ready for work now.

 

[jmssaws]

I cut them out with a sharp wood chisel
Or drill the spot welds

 

[Wilhelm]

I run my saws as follows:
- Sachs-Dolmar 105 & Dolmar PS-6400 - stock mufflers
- Sachs-Dolmar 108 & Dolmar PS-7900 - lightly modified mufflers, added breathing area without impacting the "stock look", these saws gained a lot of (subjective) noise

The Sachs-Dolmar 105 & 108 share identical mufflers, as do the Dolmar PS-6400 & PS-7900.
That been said I was considering test muffler swaps stock/modded/stock but I have two issues:
1) I have limited free time
2) I have no firewood to cut whatsoever (I overdid firewood processing last year and as it seems may not get any this year )

I have a cheap laser thermometer inbound which I purchased to track down the reason for the vapor lock my PS-7900 is prone to while my PS-6400 is not.
It could come handy to verify heat dissipation of stock & modded mufflers.

It is only subjectively, but I think my PS-7900 likes her current modded muffler setup.
I am not so sure about the Sachs-Dolmar 108 and her modded muffler, I didn't notice any subjective gains after modding it.

 

[Brush Ape]

I hear ya! After muffler modding my homelite I Have to wear ear muffs or my ears will ring loud enough for others to hear! lol View attachment 27013

Did a kinder gartner weld them pipes on there with a crayon???

 

[jmssaws]

A stock saws port timing plays a role in how much it will gain from a muffler mod,also how restricted it is from the factory.

 

[jmssaws]

Stock late 660
stick red light 066

 

[big t double]

My dual port cover saws are ear busting loud.

ya don't say....

Stock late 660
View attachment 27020 stick red light 066
View attachment 27021

now show the jmssaw "dual port"

 

[Lightning Performance]

The 066 front cover added to my bone stock gasket in place work saw 660 did improve RPM about 800-1K. It did lose a lot of heat and that was the main goal. -100* was the new temp gun reading on the muffler near the head. The exhaust fumes got worse as expected. Was it worth it, IMO yes. Eats a bit more petrol.