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Special motor? for log splitter

Discussion in 'Firewood, Heating and Wood Burning Equipment' started by David Wayne, Nov 18, 2019.

  1. David Wayne

    David Wayne ArboristSite Operative

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    My splitter motor is getting tired and when it quits for good I will get a predator to replace it. I have been told by some folks it takes a motor made for a splitter, something about a special flywheel or the motor wont last! Logic tells me this is bogus. I did some searching on here and see several threads about replacing motors with predators and pressure washer motors ect. some are 10 year old threads. How have the motors held up? Is there any truth to the claim of needing a motor made for a splitter.
    Thanks in advance.
    David
     
  2. landfakers

    landfakers ArboristSite Lurker

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    No special motor needed. The predators are great motors and a no brainer especially if you don’t run your splitter all day every day. I had to cut the shaft on mine in order to get the spacing right but I know other people who just swap over everything and are running in a half hour.
     
  3. 4seasons

    4seasons ArboristSite Guru

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    If your splitter is the basic 2 stage hydraulic pump based unit that is very common, nothing is special about the motor. You don't even have to worry about vertical or horizontal shafts because the pump doesn't matter. If the motor has the same rotation, the same size and style of shaft, the same mounting hole spacing, and the same or more power, it is an hour bolt on job.
    You can get fancy with changing the mount location and routing exhaust for a better fit, but the biggest problem you may find is if your shaft isn't the same, or the mount doesn't match, you will need a different coupling.
     
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  4. memory

    memory ArboristSite Guru

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    I have a 20ton splitter that had a 5hp Briggs motor, it went out recently. Replaced it with a 6.5hp predator from Harbor freight. Did have to drill 2 new holes on the splitter frame and had to cut the shaft a little shorter to make the coupler line up right. Been less than a year but no issues yet. Before the motor would bog down in tough pieces but not now.
     
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  5. Ted Jenkins

    Ted Jenkins Firewood by TJ

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    Horizontal shaft motors are much different than vertical shaft motors. Vertical shaft moors do not have flywheels so they need to be added to operate properly. Any one can change vertical to horizontal or horizontal to vertical, but with a little effort. Most clone engines or Honda engines can last many years of heavy use if they are maintained. Most Briggs and Tecumseh were prone to run low on oil until they stuck the rod through the side. Many engines have low oil pressure shut offs which is a very good thing. Thanks
     
  6. Ted Jenkins

    Ted Jenkins Firewood by TJ

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    Horizontal shaft motors are much different than vertical shaft motors. Vertical shaft moors do not have flywheels so they need to be added to operate properly. Any one can change vertical to horizontal or horizontal to vertical, but with a little effort. Most clone engines or Honda engines can last many years of heavy use if they are maintained. Most Briggs and Tecumseh were prone to run low on oil until they stuck the rod through the side. Many engines have low oil pressure shut offs which is a very good thing. Thanks
     
  7. David Wayne

    David Wayne ArboristSite Operative

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    Mine is vertical, So are you saying I cant put just any motor on it?
     
  8. triptester

    triptester Addicted to ArboristSite

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    The problem with changing vertical shaft engines is that the mounting pattern varies and the pumps are not connected directly to the engine. This makes pump alignment difficult but it can be done with patience.
    Horizontal shaft engines for many years have factory machined standardized pump adaptor mounting surfaces.
     
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  9. blades

    blades Addicted to ArboristSite

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    since when does a vertical small ICE not have a flywheel? I have never seen a small engine with out a flywheel horz or vert. that goes for my vechiles and boat motors as well. Guess I missed something somewhere.
     
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  10. David Wayne

    David Wayne ArboristSite Operative

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    Mounting wont be an issue, it bolts to a flat steel plate so just drill as needed. And I have a magnetic base dial indicator to get within love joy coupling specs.
     
  11. Ted Jenkins

    Ted Jenkins Firewood by TJ

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    Yes you are correct many vertical motor do not have flywheels. So if you want a well oiled machine to need to add it the crank. Vertical shaft motors will often have a rotating blade that acts like a flywheel. I like using horizontal set ups because they can be more compact, but they all work. Thanks
     
  12. frank_

    frank_ ArboristSite Lurker

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    how do these "vertical shaft/non flywheel engines" generate a spark ? some mowers will kick without a blade but thats just spark timing related surely ?
     
  13. sb47

    sb47 Addicted to ArboristSite

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    In the motocross world many race motors have the flywheel machined down to reduce weight, but it comes at a cost of torque. The lighter the flywheel the les low end torque you will have. I doubt it would have any effect on a splitter.
     
  14. blades

    blades Addicted to ArboristSite

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    sure you are not confusing 2 stroke with 4 stroke?
     
  15. frank_

    frank_ ArboristSite Lurker

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    same applies to 2 and 4 stroke, hp and torque output remains the same, just faster throttle response, here,s my stockcar with no flywheel :)
     
  16. cedarhollow

    cedarhollow ArboristSite Guru

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    some lawn mowers, like some sarlos for example have a large round weight that bolts to end of crankshaft over belt pulley and use a non weighted flywheel engine-the only ones i have ever seen are vertical engines.
    ive got to believe that universal purpose engines such as harbor freight horizontal engines have weighted flywheel.
     
  17. blades

    blades Addicted to ArboristSite

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    weight on crank shaft same purpose- still a flywheel of a type- storing energy from the power stroke to be used on non powered stroke. Ok, so a 2 cylinder or more 4 stroke ICE might not have a fly wheel in the conventional sense of a single cylinder 4 stroke engine. Sequential or apposed firing would eliminate the need. Just a ring gear somewhere to enable electric starting. Thinking back, some aircraft engines used explosive charges to get things going so no ring gear either for starting purposes, but I do not know if those were 2 stroke or 4 stroke ( old age can't remember) ain't no expert on the fine points of engines.
     
  18. Ted Jenkins

    Ted Jenkins Firewood by TJ

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    Not quite exact in the Motocross world. MX bikes for most part have extra weight available for bikes that are too abrupt with power delivery thus they loose traction. With added weight to the flywheel the power delivery can be smoothed out a bit for better traction such as leaving a corner. Flywheels do not have an effect on torque other than if there is not enough flywheel the engine will not start. Thanks
     
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  19. Ted Jenkins

    Ted Jenkins Firewood by TJ

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    Or in other words VERTICAL engines that are not used for lawn mowers need some extra flywheel to keep them running smooth. HORIZONTAL engines do not need extra flywheel because they are not often used for lawn mowers. The blade on a lawn mower is the flywheel. Thanks
     
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  20. sb47

    sb47 Addicted to ArboristSite

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    You are correct, I just didn't enplane it right. My bad.:)
     

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