Old Craftsman chainsaw, 3.7 ci
05-09-2003, 03:18 AM
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Old Craftsman chainsaw, 3.7 ci
I have a lead on this saw and wonder if anyone has a clue if this sounds like another Poulan. Not sure how old it is but wondering if the size rings any bells for anyone. 3.7ci=60cc, I think this is a great size. Any thoughts?
05-09-2003, 03:26 AM
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Old Craftsman chainsaw, 3.7 ci
I cant say Im familiar with it but it sounds interesting. If the price is right and its not wore out (compression) its probably worth a try.
Adam
I have noticed that the recent Craftsman saws are Poulans. I dont know how long they have done that.
Adam
I have noticed that the recent Craftsman saws are Poulans. I dont know how long they have done that.
05-10-2003, 03:45 AM
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Old Craftsman chainsaw, 3.7 ci
I have converted one havn't flown it but ran on test stand. APC 22x8 6800rpm 19#thrust with flywheel and coil + mount+prop 6.3lb I was a little disappointed with the power and it seemed to vibrate a little more than other conversions I have done. If you needed weight in the nose it might be worth it one could get about another lb off if you used electronic ign. Steve
05-12-2003, 01:08 PM
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Old Craftsman chainsaw, 3.7 ci
Ken, you you happen to have any pics of the craftsman/roper 3.7. I stripped an old orange craftsman saw that I was thinking was a 60cc. The engine has a roper tag on it. It has a side mounded reed valve induction carb. I haven't fired it up yet because I was not sure what size it really was.
Mark
Mark
05-12-2003, 11:38 PM
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Old Craftsman chainsaw, 3.7 ci
Here's a shot of the 3.7 Roper, this one came out of a Montgomery Ward chainsaw. Very stout motor! A friend of mine wanted me to convert it for him because it used to belong to his grandfather.
05-13-2003, 12:59 AM
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Old Craftsman chainsaw, 3.7 ci
What's that thing weigh? Looks cool, in an odd, engineering sort a way. Thanks for the responses. Haven't laid eyes on this thing yet so I still don't know.
05-13-2003, 01:35 AM
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Old Craftsman chainsaw, 3.7 ci
Thanks for the pics. That confirms it. I have the exact same engine. I found a bennett muffler for it, I just have to finish up the hub and sensor mount. I can't wait to fire it up now!
05-14-2003, 02:23 AM
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flipflop: I have a sears 4.2 saw. The engine looks simular. I bought it new and only cut wood for about 3 winters. The saw is like new yet. Did you cut the big flywheel down in a lathe? I always thought the engine was a pouland??? Captin
05-14-2003, 09:37 PM
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Old Craftsman chainsaw, 3.7 ci
Yep, turned the flywheel and on this particular engine, since the flywheel was so far away from the crankcase, I turned and bolted an aluminum ring to bolt to the back of the flywheel.
12-24-2004, 07:36 PM
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RE: Old Craftsman chainsaw, 3.7 ci
Hiya Folks, pretty neat stuff. I found one of these in the dump, no bar, chain or sprocket. rolls over ok and seems to have lots of compression. I'll put some fuel in it and see if it sparks up. Think I'll go with the 40:1 fuel mix on first start. I haven't pulled the rest of the casing off yet, so don't know what shape the rest of it's in, the carb looks clean so that's a promis. I have a Unimat SL1000 and will try to trim and balance the flywheel down to lighten the power plant. Any idea what size aircraft this puppy will power? I have a 6' W/S Spitfire that takes an '80 and would like to up-scale it to fit one of these. LOL,, sounds like lots of work but I sure enjoyed building it, apart from finding parts glued to me and getting stuck to the table. Cheers
12-27-2004, 05:06 PM
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RE: Old Craftsman chainsaw, 3.7 ci
Hi guys, I used to live in the town that had the roper factory that made these engines and saws. They are very powerful for there size but only have 2 main bearings and do not hold up real well to thrust loads. I have done 2 conversions and know of several more that have been done. I used a solid state point eliminator from Dick Bennet that worked suprisingly well on one, it had to be started using a starter though. I am currently cutting down a Sthil super 45 ( about 70 + cc's) that my brother gave up on years ago. I have a C&H unit with electronic advance and am looking forward to getting it going. If anyone is interested, they can have another Roper I have sitting around, just needs a carb and finish prop hub adaptor to be ready to use.
03-05-2006, 07:58 PM
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RE: Old Craftsman chainsaw, 3.7 ci
here is one for ya i have a roper 3.7 manufactured as an aircraft engine it was distributed through horners sales i have a parts breakdown and all the specks on this engine if anyones interested.
mine is 5lb ready to fly prop hub spiner and all
mine is 5lb ready to fly prop hub spiner and all
