Chainsaw Repair

Husqvarna - Stihl - Poulan - Jonsered - Dolmar chainsaws and more => Stihl => Topic started by: JP Terp on October 31, 2013, 01:02:09 pm

Title: Stihl 044 10mm cylinder question
Post by: JP Terp 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
Title: Re: Stihl 044 10mm cylinder question
Post by: Adirondackstihl 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?
Title: Re: Stihl 044 10mm cylinder question
Post by: Moparmyway on November 01, 2013, 04:33:45 pm
Didnt the 10mm's also have crank stuffers to help increase velocity by reducing crankcase volume ?

Title: Re: Stihl 044 10mm cylinder question
Post by: Adirondackstihl on November 01, 2013, 04:43:29 pm
No.
But I bet a full circle crank would be  :o
Title: Re: Stihl 044 10mm cylinder question
Post by: JP Terp 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.
Title: Re: Stihl 044 10mm cylinder question
Post by: 660magnum on November 01, 2013, 11:30:50 pm
Timed cuts - There you go.

Be sure and use the same bar and chain.