Stipes was the first 440 jug I had ported, so I also just kind of wanted to try one out for myself. I know how much I like a 460, but was very impressed with this saw stock.
Crazy MS440 Popup
- Thread starter blsnelling
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Erick
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Thats not me Brad... its the monkey!!
:monkey:
I'd rather carry a monkey than you ANY DAY!!!!!!!!!:greenchainsaw:
Erick
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FATGUY
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I had to look twice when I saw the pic the first time, and I'm the one who cut it!!!
FATGUY
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You Da Man Nik!!!!!as always.
Looks like your really liking the pop ups in the mill?
As a rule, lathes are better at doing "round stuff." In the instance of pop-ups however, there's no advantage to doing it on the lathe.
Rftreeman
Addicted to ArboristSite
ok, fill me in, what's the purpose of removing material from the top of the piston??
wigglesworth
Booned
You turn a pop up, then lower the cylinder down to increase compression
After removing material around the squish band, the cylinder is then dropped down over it. The popup then displaces volume in the combustion chamber, which increase compression. More compression means more power, to a point.
Rftreeman
Addicted to ArboristSite
gotcha, wasn't aware that you were shaving the cylinder down also, totally understand now, have done the same thing to my race V8 engines, didn't do the pistons but did buy pop up style and cut the heads down some..
danw
ArboristSite Lurker
Do you run a different mix of fuel for this higher compression? What's the optimum compression? I would think at some point the compression becomes parasitic and reduces power.
I believe so, but can't speak from personal experience. I've heard that 190 PSI is about as high as you want to go on a work saw.
Wild Knight
ArboristSite Guru
Nice work Nik!
I've read about off-center combustion chambers in Jennings and Bell, but never seen a pop-up for one. Is it going to affect the expansion of the piston crown?
I've read about off-center combustion chambers in Jennings and Bell, but never seen a pop-up for one. Is it going to affect the expansion of the piston crown?
little possum
Crash and Burn
I stared at it for a couple of minutes trying to figure it out. lol
I was gonna say, I dont know the benefits, but props to the machinist.
You running a CNC?
FATGUY
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we have both conventional and CNC but we use our CNC's 99% of the time. The conventionals are either used for very sensitive operations or for things with very open tolerances.
I finally got this saw into some wood today. It's pulling an 8-pin rim on a 28" B&C. I forgot that I had put the 8-pin on there and was wonder why it didn't seem to have the torque I expected, lol. I had run out of 7-pin rims so had just stuck the 8-pin on there. That's a lot to ask of a 440, but it didn't do too bad at all. You'll notice about half way through the cut that the saw almost just sets there. There were some crazy hard knots that showed up in the log and really slowed things down.
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Mastermind
Work Saw Specialist
I clicked on the video before I even read what you had posted. I thought it was a bit dull or something, but it sounds great.
After seeing that it's pulling a 8 pin sprocket through wood that large and hard, it has to be producing a lot of torque.
Thanks for the video, I'm a bit bored here and needed the distraction. LOL
After seeing that it's pulling a 8 pin sprocket through wood that large and hard, it has to be producing a lot of torque.
Thanks for the video, I'm a bit bored here and needed the distraction. LOL
wigglesworth
Booned
It sounded a bit lean to my untrained ear?
There are several knots in that wood that are carzy hard. The saw would just almost stop when it hit them. I hope to get some better vids of it tonight, and it will be wearing a 7-pin. I only had the 8 on there because I was out of 7s. I did sharpen the chain as well. The rakers were way off too. Me and rakers just cannot seem to get along
