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colt357_2004

Torque vs Horsepower

17 years ago

From '03 to '06 I had 1.5 acres in Springtown Texas. The long commute to Ft Worth everyday, the price of gas etc, made us move back to town. For now.

Out there I used a 18hp Craftsman tractor, and a Toro commercial walk behind for the close work. I don't recall the Toro having a HP rating on it.

The Craftsman wouldn't fit through the gate and the Toro finally died. I started shopping mowers and noticed now they are rated in torque.

What's up with that?

I got a Toro Re cycler, I have mentioned in these forums and it's rated at 6.75 torque. I could google it, but thought you guys might have more fun telling me what that is in HP.

Thanks

Comments (7)

  • 17 years ago

    "you guys might have more fun telling me what that is"

    While your having fun working that out learn why different engine mfgs claiming equal torque will run stronger or weaker than others.

  • 17 years ago

    Ok so I couldn't wait and I went ahead and googled it.
    "torque is the immediate twisting or rotational
    force a machine can produce at a given moment"
    "Q: Why is a torque rating used
    instead of horsepower?
    A: Briggs & Stratton now uses torque
    ratings because it more directly describes
    the cutting capability and job capacity of a
    walk-behind mower."
    Makes sense.

  • 17 years ago

    Maybe because many people buy the number .. horsepower on a honda engine I just check is around a 40% smaller number. So if it holds true on that 6.75 ft pounds of torque rating(which is a pretty weak number on a large torque wrench) x .60 means it may only have 4 hp. Which really looks puny.

    Here is a link that might be useful: http://www.honda-engines.com/engines/gx620.htm

  • 17 years ago

    IIRC, Honda uses net ratings for torque, while Briggs uses gross ratings---that would explain the smaller number.

  • 17 years ago

    Skipping some details but Briggs measured power at 3600 rpm. Mowers are governed to around 3200 rpm so the engines never developed the rated power. Lawyers got involved in a class action way.

  • 17 years ago

    The HP number was dropped in recent advertising. The H.P. and torque numbers are pretty much meaningless when it comes to giving a consumer useful information about whether one mower will cut grass better than another.

    That said, some of us do like big numbers, so lawn mower manufacturers could re-focus marketing efforts on cubic displacement. But instead of inches or centimeters, maybe cubic millimeters would provide some bragging rights. Yes, instead of a boring 12 cubic inches one could have an amazing 200,000 cubic millimeter mower engine!

    I vaguely remember a lawsuit involving misstated h.p. numbers.

  • 17 years ago

    Torque is twisting force, and does not need to be rotating, just potential.
    Horse Power is work over time.

    But just for a comparison.

    Think of a big rig diesel engine as a high torque developing engine.
    Huge torque numbers, but done slowly over time so it measures as less HP.
    Example Detroit series 60, 1650 ft lb of torque @1650 rpm but only 515 HP.

    And a screaming motorcycle engine designed as a high HP developing engine.
    Lots of HP work done quickly over time, but not much torque in comparison.
    Example: 2004 Cbr1000rr 153 HP @11,000 but only 75 ft lb of torque.

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