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malk315

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Some dyno curves that go w/ what you guys have been discussing. This is w/ the motorcycle brake one that was still a bit noisy but the data can be useful on these. Bone stock MS460 we did as a baseline -- matches Stihl's specs pretty well of around 6HP at 9500 RPM or somewhere around there I don't remember what RPM exactly Stihl reported their spec at:

upload_2017-2-7_20-24-26.png

About 6HP between 9500 and 7000 or so. Note the torque scale on the left is different than HP scale on the right -- torque at 9500 is 3.26 ft-lbs. Torque at 7500 is about 4.2 ft-lbs. The saws always wanted to drop right off when lugged down to 7000 RPM they always seem to do much better when producing the power between 9000 and 11000. Some saws had a nice big power band with the grunt in the wood to back it up. Jason's 064 that has been banished to the woods to do some real work has one of my favorite graphs from last year's dyno event:

upload_2017-2-7_20-33-1.png

The above averages 9HP between 11000 and 8000 RPM with torque between 4 and 7 ft-lbs on the same band.
 

jmssaws

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Some dyno curves that go w/ what you guys have been discussing. This is w/ the motorcycle brake one that was still a bit noisy but the data can be useful on these. Bone stock MS460 we did as a baseline -- matches Stihl's specs pretty well of around 6HP at 9500 RPM or somewhere around there I don't remember what RPM exactly Stihl reported their spec at:

View attachment 54576

About 6HP between 9500 and 7000 or so. Note the torque scale on the left is different than HP scale on the right -- torque at 9500 is 3.26 ft-lbs. Torque at 7500 is about 4.2 ft-lbs. The saws always wanted to drop right off when lugged down to 7000 RPM they always seem to do much better when producing the power between 9000 and 11000. Some saws had a nice big power band with the grunt in the wood to back it up. Jason's 064 that has been banished to the woods to do some real work has one of my favorite graphs from last year's dyno event:

View attachment 54585

The above averages 9HP between 11000 and 8000 RPM with torque between 4 and 7 ft-lbs on the same band.
A couple years ago when I ported that cylinder I never thought I'd be able to get one better.
Put bearings in it a while back and took it for a spin,still ran pretty good.

It's hard crank bearings but my buddy likes it for falling small timber,he mostly runs a ported 661 now.
 

awol

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Speaking of old ones, here is a 790 on its first run after a rebuild. This old Mac will still embarass almost any stock modern saw.



And here are a bunch of oldies at the first saw races I attended.

 
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