Maybe you need a 70-80cc saw
New Husqvarna 465 Rancher
- Thread starter mpgido
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Maybe you need a 70-80cc saw
SmellyPirateHooker
ArboristSite Guru
Having both the 562xp and cs620 that would be my thoughts. Even though the HP numbers are similar the cs seems to win out on saws with higher HP ratings. My educated guess, would still like to see the showdown.
row.man
Just visiting this planet
The Echo's seem to have more grunt for the displacement
SmellyPirateHooker
ArboristSite Guru
There is more to engine output then HP. Besides the obvious, which would be torque, there's things like the how long an engine produces close to peak power in its RPM band. This transcends all engines and is why electric motors are king. It's how a 400 hp car can beat a 430 hp car.
If one saw has 7hp and the other 6.7, the 7hp saw is more powerful right? Well not necessarily, if the the 7hp saw has a real fast rise to that HP and significantly drops off anywhere else, while the 6.7 holds close to its max for a few thousand RPM, the 6.7 is actually a stronger engine and can produce more work. If you want to compare to engines with a dyno sheet, you calculate the area of the HP on that sheet for both. The one encompassing the most area is the more powerful engine, not necessarily the one with the highest peaks. For saws really, timed cuts with identical bar and chain is probably the only way to accurately compare, and I'd do the test with multiple length bars.
If one saw has 7hp and the other 6.7, the 7hp saw is more powerful right? Well not necessarily, if the the 7hp saw has a real fast rise to that HP and significantly drops off anywhere else, while the 6.7 holds close to its max for a few thousand RPM, the 6.7 is actually a stronger engine and can produce more work. If you want to compare to engines with a dyno sheet, you calculate the area of the HP on that sheet for both. The one encompassing the most area is the more powerful engine, not necessarily the one with the highest peaks. For saws really, timed cuts with identical bar and chain is probably the only way to accurately compare, and I'd do the test with multiple length bars.
