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Thread: gas engine vs electric

  1. #1
    Join Date
    Nov 2007
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    618

    gas engine vs electric

    My dad has a hydraulic wood splitter that he would like to operate inside his pole barn. It is currently set up with a 5hp 4 cycle gas engine and a 2 stage hydraulic pump. Would anyone here know what size electric motor would be required to give the same performance as the gas engine? I'm not 100% certain but i believe the rpm of the gas engine is around 3600, aren't most electric motors 1750? Shaft size, coupling, and mounting are not a concern just would like to know if something like this would be possible to do. Power source would be 240V AC single phase. Thanks.

  2. #2
    Join Date
    Feb 2003
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    Massachusetts
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    49,220
    Many times I have noticed that an item that can come with either a gas or electric motor will use a larger gas motor than an electric. I can remember seeing things with either a 5HP gas or 3HP electric.

    That aside if it was me I would order a 3600 RPM 5 HP electric motor to make sure it had enough power and there is no way I would want to cut the speed in half.

  3. #3
    Join Date
    Jan 2011
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    Quote Originally Posted by nizak View Post
    a 5hp engine
    what size electric motor would be required to give the same performance as the gas engine?
    This question has come up before on other forums.
    Best way is to ask several splitter manufacturers, they almost certainly know this answer.
    Next best is to look at torque-speed curves for this particular engine and try to match the motor's curve at the RPM you need. The curves will be shaped quite differently.
    Last way is to Websearch similar machines that offer both options, and plot a graph of engine hp vs. motor hp and motor type offered for each. Eyeballing the graph will tell you what size motor you need and also how much variation there is in doing this exchange.

    Too high RPM will shorten the life of the splitter by overheating.

    hp always equals RPM x torque/5252
    Last edited by G._S._Ohm; 03-22-11 at 02:33 PM.

  4. #4
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    Quote Originally Posted by G._S._Ohm View Post
    This question has come up before on other forums.
    Best way is to ask several splitter manufacturers, they almost certainly know this answer.
    Next best is to look at torque-speed curves for this particular engine and try to match the motor's curve at the RPM you need. The curves will be shaped quite differently.
    Last way is to Websearch similar machines that offer both options, and plot a graph of engine hp vs. motor hp and motor type offered for each. Eyeballing the graph will tell you what size motor you need and also how much variation there is in doing this exchange.
    You must be the wild one at parties.

  5. #5
    Join Date
    May 2005
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    Quote Originally Posted by iwire View Post
    You must be the wild one at parties.
    :grin:
    Code references based on 2005 NEC
    Larry B. Fine
    Master Electrician
    Electrical Contractor
    Richmond, VA

  6. #6
    Join Date
    Jan 2008
    Location
    Raeford, NC
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    3,514
    Friend of mine built his own log splitter and used a 5hp 240v elect. motor. I ask him why he did not use a gas engine because he had several setting around. he smiled and said " this way every one in the country wont want to borrow the thing. They have no where to plug it in"
    Organized people are people that are just too lazy to look for their stuff

  7. #7
    Join Date
    Jan 2011
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    Quote Originally Posted by iwire View Post
    You must be the wild one at parties.
    Used to be. I'd drink their booze, eat their food, steal their women and leave.

    How's this?
    I'd drink/eat/steal
    their
    booze/food/women
    and
    leave.

    Just don't mix up any words from the first line.
    Last edited by G._S._Ohm; 03-23-11 at 01:16 PM.

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