Author Topic: Stihl 044 10mm cylinder question  (Read 202 times)

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Offline JP Terp

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Stihl 044 10mm cylinder question
« on: October 31, 2013, 01:02:09 pm »
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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Offline Adirondackstihl

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Re: Stihl 044 10mm cylinder question
« Reply #1 on: October 31, 2013, 03:08:48 pm »
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?

Offline Moparmyway

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Re: Stihl 044 10mm cylinder question
« Reply #2 on: November 01, 2013, 04:33:45 pm »
Didnt the 10mm's also have crank stuffers to help increase velocity by reducing crankcase volume ?


Offline Adirondackstihl

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Re: Stihl 044 10mm cylinder question
« Reply #3 on: November 01, 2013, 04:43:29 pm »
No.
But I bet a full circle crank would be  :o

Offline JP Terp

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Re: Stihl 044 10mm cylinder question
« Reply #4 on: November 01, 2013, 10:43:01 pm »
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.

Offline 660magnum

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Re: Stihl 044 10mm cylinder question
« Reply #5 on: November 01, 2013, 11:30:50 pm »
Timed cuts - There you go.

Be sure and use the same bar and chain.
We should share what we know... someone may learn...
That knowledge can live after us... and that "Pays It Forward".
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