Gwiz
ArboristSite Lurker
Every post I make here, I just know I'll get a good bashing from someone who knows more than me. Just the other day someone was quick to criticize the guy who wanted to build his own bucking spikes using AutoCAD when he could have bought new ones for $15. That caught my eye because I'm just learning to use AutoCAD: a very handy tool for such things.
I just traced the shape of the factory cylinder exhaust port of my 261 and then measured it as accurately as I could with the tools I have. Then I drew it on CAD so the computer could figure the area for me. After printing the shape at full scale, I held it back inside the cylinder to confirm a near perfect shape and size.
Maybe there is a better source of area out there that I haven't heard of, but I know this was a lot easier than trying to figure this area by hand. I figured the area at .4169 square inches.
Maybe that can help someone with there muffler mod. How does that compare to any of your figures for the same saw?
Maybe when I take the muffler apart to drill more holes I'll calculate the area of the factory exhaust in relation to the exhaust port area. We'll see how far below the recommended 80+% the factory EPA muffler was.
James
I just traced the shape of the factory cylinder exhaust port of my 261 and then measured it as accurately as I could with the tools I have. Then I drew it on CAD so the computer could figure the area for me. After printing the shape at full scale, I held it back inside the cylinder to confirm a near perfect shape and size.
Maybe there is a better source of area out there that I haven't heard of, but I know this was a lot easier than trying to figure this area by hand. I figured the area at .4169 square inches.
Maybe that can help someone with there muffler mod. How does that compare to any of your figures for the same saw?
Maybe when I take the muffler apart to drill more holes I'll calculate the area of the factory exhaust in relation to the exhaust port area. We'll see how far below the recommended 80+% the factory EPA muffler was.
James