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huskyboy

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Wow. You are relentless. Only my 2nd time using the bar, and 1st time with a new chain. And I guess I'll never live it down...

Just remember this...

Different bar, different chain. Nothing really to argue there. The wild difference in times between all the saws was pretty obvious man. I also think racing in small pine is pointless to me with big saws. Strap on a 32 or 36 and bury it in a oak log with an aggressive full comp chain. You’ll see what saws are peaky and what ones have torque very quickly.
 
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mdavlee

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I swapped this ported 7910 with 046 piston topend to another 6421 chassis. The bottom end it was on was going out (pto bearing play). I decided to do a little work to the jug/piston while it was apart. On first start it was sucking the choke shut on full throttle and I had to wind the spring tighter. After that I ran a 36” and 8 pin full comp in oak to stress test it.

Jack’s saw?
 

Deets066

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Different bar, different chain. Nothing really to argue there. The wild difference in times between all the saws is pretty obvious man. I also think racing in small pine is pointless to me with big saws. Strap on a 32 or 36 and bury it in a oak log with an aggressive full comp chain. You’ll see what saws are peaky and what ones have torque very quickly.
Meh, more power gets through the wood faster. Regardless of size or type
 

huskyboy

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Meh, more power gets through the wood faster. Regardless of size or type
From my experiences from a worksaw perspective lower peak hp, but wider power band can be faster in some circumstances than higher hp with narrow power band in part because it’s easier to apply the power in an effective way. This is because it’s making more hp and torque in other parts of the rpm range. In the real world the chain can’t always be perfectly set up for the peakier saws. But this is a complicated topic really with many opinions it seems. I’m far from an expert. Just a logger who cuts firewood too. I guess it depends on what your using the saw for.
 
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Deets066

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From my experiences from a worksaw perspective lower peak hp, but wider power band can be faster in some circumstances than higher hp with narrow power band in part because it’s easier to apply the power in an effective way. This is because it’s making more hp and torque in other parts of the rpm range. In the real world the chain can’t always be perfectly set up for the peakier saws. But this is a complicated topic really with many opinions it seems. I’m far from an expert. Just a logger who cuts firewood too. I guess it depends on what your using the saw for.
Lot of truth in that, but then your trying to test useabillity which different than seeing who has more power.
 

chipper1

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I swapped this ported 7910 with 046 piston topend to another 6421 chassis. The bottom end it was on was going out (pto bearing play). I decided to do a little work to the jug/piston while it was apart. On first start it was sucking the choke shut on full throttle and I had to wind the spring tighter. After that I ran a 32” and 8 pin full comp in oak to stress test it.
I like it.
And with and 8 pin :eek:.
 

Deets066

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From my experiences from a worksaw perspective lower peak hp, but wider power band can be faster in some circumstances than higher hp with narrow power band in part because it’s easier to apply the power in an effective way. This is because it’s making more hp and torque in other parts of the rpm range. In the real world the chain can’t always be perfectly set up for the peakier saws. But this is a complicated topic really with many opinions it seems. I’m far from an expert. Just a logger who cuts firewood too. I guess it depends on what your using the saw for.
Lot of truth in that, but then your trying to test useabillity which is a lot different
 

Nutball

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My second version modding a 590, this time with more intake duration.

The idle sounds really cool. The third cut is a power curve test, the first 2 were for speed. I made a warm up cut first off to the side.

I like the power curve, It's hard telling if it gained 1-2 seconds over the first version, or if the log got smaller. It did well with an imperfect chain. I think I'll try to get a little more peak power out of it.
 

Deets066

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My second version modding a 590, this time with more intake duration.

The idle sounds really cool. The third cut is a power curve test, the first 2 were for speed. I made a warm up cut first off to the side.

I like the power curve, It's hard telling if it gained 1-2 seconds over the first version, or if the log got smaller. It did well with an imperfect chain. I think I'll try to get a little more peak power out of it.

They have a hell of an idle
 
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