longbowch
ArboristSite Guru
Thoughts and opinions please.
ms440 with a 8 pin and a 25 inch bar
- Thread starter longbowch
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I would think, if it would work fine with an 8 pin sprocket in 25 inch wood, it would come with an 8 pin from the factory. Having said that, I recently put an 8 pin on my muffler modded 2171, just to see how it goes. I only made a couple cuts so far, because I'm trying to get other things done before the snow flies. My feeling is, it will help in softer and smaller diameter wood, but it will be better with the 7 pin in the big, hard stuff unless you baby it in the cut. Obviously, you lose torque, but you have to remember, the energy from the engine is still all there. You've just traded some torque for some speed. Work=force X distance, so you haven't actually changed the HP. There are guys on here that think a 24" bar is too much for 70cc's, then there are guys that will run full comp,.404, square ground chain on a 33" bar, with an 8 pin sprocket, on a 95cc saw (I know, I bought one set up like that). We have to find, and then accept reality.
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Philip Wheelock
Finis Origine Pendet
If you're looking to bury the bar with a stock 440, 25" w/ 7-pin in softwood; 20" w/ 7-pin in hardwood.
harrygrey382
Addicted to ArboristSite
no way, it doesn't have anywhere near enough power
Will it do it? Sure, but not all that well and it's harder on the saw.
SawTroll
Information Collector
Likely a bad idea, as others have indicated!
I have tried a 8 on a 460 up here. On smaller stuff it is workable. Won't pull it good with a loaded bar. The 440 doesn't have the same torque as a 460, I would say that it would not work well. The 440's like to wind up pretty good, a 7T sprocket is perfect for that saw.
windthrown
361 Junkie
There is a trade-off between torque and chain speed. It will work if you feather it, but it will bog easier. You could run that setup with full skip, which would be good for noodling rounds (easiest way to cut wood). Less cutters, less torque required in the cut to keep them moving. I usually use an 8 pin on 20 inch and less on a 70cc saw, and with a 16 on a 60cc saw with full comp loops. They cut faster that way when thinning smaller trees in a stand or topping felled trees. Bucking semi-dry hardwood like oak or madrone I will use a 7 pin with most bars on a bigger saw though. It all depends on what and how you are cutting.
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On the trees in the PNW, using full skip square, it should be fine. Louisiana? Dunno.
longbowch
ArboristSite Guru
Thanks all for the replys. That's what I thought but I might experiment for myself.
homelitejim
Full of Scrap
Nah I tried I tried it on my 441 and a 20" bar and it would get hung up in the knots of the softest firs. Went back to a 7 pin and it is unstoppable.
tek9tim
ArboristSite Guru
Yeah, but that's a 441, never run one that felt as strong as a 44. I've run 8 tooth sprockets on 044/440s with 28" bars a lot. Have to keep your square ground chain sharp, can't run your rakers lower than .025. On the upside, you can just let the saw eat through the wood with very little pressure and let the chainspeed stay high. That setup can run fast... if you are conservative with your raker height and how hard you push the saw and if you are in softwoods. The 7 tooth is more forgiving for sure.
Should also be said that I very rarely run stock saws, so my view may be slanted a tad.
My 50cc echo can run a 20" bar in the softest firs in Washington.
