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Throttle speed make a difference?

Discussion in 'Lawn Mowing' started by khutch, Mar 20, 2004.

  1. khutch

    khutch LawnSite Senior Member
    Messages: 495

    Does throttle/engine speed make much of a difference in cut?
    My Exmark 36 w/b seems to be cutting well at half-throttle, gears 3-4. Does this have a dramatic effect on blade speed and/or cut?
  2. KenH

    KenH LawnSite Bronze Member
    from CT
    Messages: 1,622

    I would definately think so. Can your belts be slipping at the higher RPM's???
  3. rodfather

    rodfather LawnSite Fanatic
    Messages: 9,501

    1/2 throttle??? Why only 1/2? Of course it has an effect on blade tip speed and cut...
  4. GrassFearsMe

    GrassFearsMe LawnSite Senior Member
    Messages: 340

    full power = better cut and better for the lawn. When you cut the engine speed drops under the strain and you end up tearing the grass and leave clumps on it. try it at full throttle you'll love it.
  5. ZaK18

    ZaK18 LawnSite Member
    Messages: 188

    If the mowing conditions are right run it at half throttle and pocket the money you saved in gas!
  6. sawman65

    sawman65 LawnSite Senior Member
    Messages: 754

    when you take an engine below it's no load rpm rateing and put the blades on and cut with it it will fall below its peek in the torque curve all the engine makers tell you to run it at full throttle

    NCSERVICE LawnSite Member
    Messages: 206

    run her wide open... for the grass discharge to work the way the manf. intended the engine needs to be at full rpm... especially full speed on a electric clutch.
  8. spoolinaround

    spoolinaround LawnSite Senior Member
    Messages: 331

    most kawi's make peak torque @ 1800-2800 rpm, as long as it is in that range or higher you should be fine
  9. lawnagent

    lawnagent LawnSite Senior Member
    Messages: 531

    If the engine is air cooled it cannot fully disipate heat by running half throttle. That is why they are designed to run full throttle. If it cannot fully disipate the heat, then you are looking at shorter engine life. A typical case of "pay a little now or alot later".
  10. mbricker

    mbricker LawnSite Senior Member
    Messages: 505

    Run wide open. EXCEPT:

    When you get on a lawn with some kind of junky sticky grass that gums up under the deck and then blows out in clumps, try mowing with about 2/3's throttle. I've also noticed sometimes I can mow a wet lawn and leave it nicer at part throttle than wide open.

    But some mowers have a slower blade tip speed than others--so part throttle might not make any didfference with your particular equipment.

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