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3 hours ago, Rough Hewn said:


Different types of power output,
Rpm and torque:

Low throw, wider but thinner piston head for decreasing the inertia.
So higher rpm is achieveable, but torque is sacrificed.

Deep throw, wide but thicker piston head for longer power stroke,
Lower rpm more torque.


Sprockets are gearing, if you don't have the torque it'll cut slower than a smaller sprocket, as well as bogging much easier.

Bar and chain gauge pitch and type,
Top plate angle, hook, gully and side tooth as well as depth gauges set at correct depths correlating to the size, density and MC of the wood you are cutting.

As previous members have said,
It's a balancing act between all these factors, and many others.

And that's just the basics of cross cutting.
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 Put the same new 25" bar and chain on a 441 and a 661. Which is going to ring up that stem faster?

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12 minutes ago, Joe Newton said:

 Put the same new 25" bar and chain on a 441 and a 661. Which is going to ring up that stem faster?

I know which I'd prefer. (with an 8pin)

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1 hour ago, skyhuck said:

I know which I'd prefer. (with an 8pin)

Even without it will still hold revs better, but yeah, you'd be wasting torque on a 7

 

I switched back from an 8 pin on my 30" bar, still can't figure which I prefer. 

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 Put the same new 25" bar and chain on a 441 and a 661. Which is going to ring up that stem faster?

Good question Joe,
If the log is 8" there will be no discernible difference, both will cut fast.
A 24" log is different,
As both saws max out at 13.5k
However the drag introduced will slow both saws to "in the wood speed"
Yes obviously the 661 has more torque for bigger wood.
But who puts a 25" bar on a 661?
I just don't get why a lot of people are obsessed with small bars on saws.
Time your cuts!
You might realise as I did that things on paper are not always correct in the real world.
If it was all about power and short bars we'd all be running 880s with 17" bars.
What you want to lug about all day is your choice.
I'm getting older so my preferred saw head is as light as possible.
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1 hour ago, Rough Hewn said:

But who puts a 25" bar on a 661?
 

Me, bought my 66 new in 1999, only ever had 25" bar on it, must have bought 6 0r7 bars in that time. 8 pin sprocket, cutting with it is a joy! can sharpen the chain in around 5minuets. I very rarely cut wood over 50", so why go bigger?

 

I have an 88 with 48", but it mostly stays home. 

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24 minutes ago, skyhuck said:

Me, bought my 66 new in 1999, only ever had 25" bar on it, must have bought 6 0r7 bars in that time. 8 pin sprocket, cutting with it is a joy! can sharpen the chain in around 5minuets. I very rarely cut wood over 50", so why go bigger?

 

I have an 88 with 48", but it mostly stays home. 

Same.

I’ve got a 36” when required, but that almost permanently lives on a hook in the workshop.

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