Chainsaw Repair
Husqvarna - Stihl - Poulan - Jonsered - Dolmar chainsaws and more => Stihl => Topic started by: JP Terp on October 31, 2013, 01:02:09 pm
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I've got 2 questions for you stihl aficionado's. How can you identify a 10 mm cylinder and is it all in the cylinder that makes these saws so good or is it the crankcase too?
The reason I ask is that I recently went thru some of my junk and came across an 044 cylinder in good shape with the angled top fins. I'm a little curious if it is a 10mm version and what kind of gains I could see over a 12mm version. I've got a good running 044 that I could compare it too - I would just switch cylinders and try it out. But, I'm not positive the this cylinder is a 10mm version. Any markings I can go by? Would I have to check the timing numbers to determine? Does anyone know where or if there is a difference in the port timing?
Thanks,
JP
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Angled fins....yes.
However, early model 12mm cylinders also had angled fins.
Only true way to find out is to know the serial # of the crankcase it came off of.
Other way would be to compare port timing #s, but isn't something the average Joe can do.
The real difference in the 10's and 12's is more aggressive port timing, smaller volume transfer tunnels & crankcase increase transfer velocity & a heavier flywheel.
I know my (2) 10mm saws have a "D" shape combustion chamber, not sure if the later 12's had that or not?
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Didnt the 10mm's also have crank stuffers to help increase velocity by reducing crankcase volume ?
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No.
But I bet a full circle crank would be :o
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When I get a chance, I'm gonna check the timing numbers on the 2 cylinders. Hopefully someone will know the difference based on what I find. I think I'll do some timed cuts with both cylinders as well to see if t h ere is any noticeable difference.
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Timed cuts - There you go.
Be sure and use the same bar and chain.