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Abby’s Guide > Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) > Discussions > Why there is no HP rating?

Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) Discussions

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bcjm


Location: Washing DC Area
Joined: Dec 2, 2011
Points: 25

Why there is no HP rating?
Original Message   Dec 12, 2011 3:50 pm
Does anyone know why the new engines does not have HP raing anymore?  It only indicates how many CC.
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JoelKlein


I wonder how a 2021 snow blower will look like...

Joined: Sep 26, 2011
Points: 74

Re: Why there is no HP rating?
Reply #12   Dec 15, 2011 2:37 am
I want to know how much "power" the augers have in terms of ability to hold it's rotation speed Under extreme conditions. Including the impeler. Remember, belts clutches etc. they all " eat" power! Including non hydro drive

Toro 1028 OXE
longboat


Joined: Feb 11, 2009
Points: 103

Re: Why there is no HP rating?
Reply #13   Dec 15, 2011 9:54 am
JoelKlein wrote:
I want to know how much "power" the augers have in terms of ability to hold it's rotation speed Under extreme conditions. Including the impeler. Remember, belts clutches etc. they all " eat" power! Including non hydro drive


Yep, there's a lot more to performance than engine power.  Centrifugal (rotating) mass can eat power, but can also allow the machine to lug through bits of heavy stuff better (the flywheel effect).  As for snowblowers, there's impeller design/speed, as well as other factors determining ultimate performance.

Things like valve timing and overlap, bore/stroke ratio, flywheel specs, etc. will determine the engine's internal lugging ability, whereas external components can determine overall lugging ability.

The old Allis Chalmers WD45 tractors were quite popular in their day (~60 years ago).  The diesel model utilized a 230c.i. (3.8L) six-cylinder engine that was tested at 30hp at the drawbar, 259lb-ft torque at 1169rpm - the gasoline model was a 226c.i. four-cylinder tested at 38hp and 288lb-ft torque at 847rpm. The HP numbers don't look impressive for the engine size, but the engines had fantastic lugging ability which was important when using ground-engaging attachments.  My brother still uses one on the farm.

This message was modified Dec 15, 2011 by longboat
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