bikesandcars
ArboristSite Operative
I've searched google and this site... several different searches produce a variety of results regarding muffler mods.
I'm starting this thread as a hopeful home for some actual engineering discussion regarding stock-size muffler modifications.
There is plenty on the web dating back to the "2-stroke era" of the 60's and 70's and through today on tuning 2-strokes and optimizing saws for competition, but unfortunately not much in those articles I've seen applies to a working chain saw as we don't have the room or desire to fit a tuned pipe.
In my reviews of all the posts here, there is a lot of good practical advice.. ie.. "I drilled a hole 1 x my port opening and it worked" or " size the muffler hole about .8x the exhaust port".
What I've never actually seen is an engineer or scientist take the problem (keeping the muffler the same size) and trying to explain what is the optimum modification(s) due to some kind of math or science.
I'm the first guy to support seat of the pants type mods... but if it works better there must be a scientific reason and maybe a way to make it work better yet...
I'm just curious if someone more knowledgable wants to share some engineering info on the details of why a muffler mod makes more power (outside of just improving basic flow) , and is there a particular formula / modification that should be followed.
Interested in some engineering discussion on things like:
how big should the box style muffler be (is there an optimum size)?
What about an inlet tube off the exhaust port? (muffler inlet tube)?
Anyone try adding different length / area stingers? Results?
I've Seen some talk on adding Baffles, stinger sizing, etc.. but no discussion on relationship to size of saw, specifics of mods, etc... all is very generic and somewhat differing.
this topic has been beaten to death but not very scientifically.. or maybe I missed it
I'm starting this thread as a hopeful home for some actual engineering discussion regarding stock-size muffler modifications.
There is plenty on the web dating back to the "2-stroke era" of the 60's and 70's and through today on tuning 2-strokes and optimizing saws for competition, but unfortunately not much in those articles I've seen applies to a working chain saw as we don't have the room or desire to fit a tuned pipe.
In my reviews of all the posts here, there is a lot of good practical advice.. ie.. "I drilled a hole 1 x my port opening and it worked" or " size the muffler hole about .8x the exhaust port".
What I've never actually seen is an engineer or scientist take the problem (keeping the muffler the same size) and trying to explain what is the optimum modification(s) due to some kind of math or science.
I'm the first guy to support seat of the pants type mods... but if it works better there must be a scientific reason and maybe a way to make it work better yet...
I'm just curious if someone more knowledgable wants to share some engineering info on the details of why a muffler mod makes more power (outside of just improving basic flow) , and is there a particular formula / modification that should be followed.
Interested in some engineering discussion on things like:
how big should the box style muffler be (is there an optimum size)?
What about an inlet tube off the exhaust port? (muffler inlet tube)?
Anyone try adding different length / area stingers? Results?
I've Seen some talk on adding Baffles, stinger sizing, etc.. but no discussion on relationship to size of saw, specifics of mods, etc... all is very generic and somewhat differing.
this topic has been beaten to death but not very scientifically.. or maybe I missed it