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  1. #1
    Silver Member
    Join Date
    Mar 2004
    Posts
    170
    Location
    South Central Ky
    Tractor
    Kubota M7040HD

    Default Engine swap, good or bad?

    20 hp Briggs twin cylinder is trashed but found some new 17.5 hp Briggs single cylinder for a good price. Will it pull a 46" mower deck ok? Looks like it will fit but will have to modify the hood for exhaust. Just wondering if I will be happy power wise. Trying not to have to go in debt to buy a mower.

  2. #2
    Platinum Member MikeInEburg's Avatar
    Join Date
    Feb 2008
    Posts
    958
    Location
    Emmitsburg, MD
    Tractor
    Kubota B7800

    Default Re: Engine swap, good or bad?

    If it physically fits, it'll work fine. Obviously, you won't have quite the power, so you may need to mow a bit slower. Most mowers are really overpowered anyway...
    Mike

    "As you go through life, make this your goal: watch the donut, not the hole"

    Kubota B7800
    BH-75A Backhoe
    Rhino 60'' finish mower

  3. #3
    Veteran Member alchemysa's Avatar
    Join Date
    Oct 2006
    Posts
    1,290
    Location
    South Australia
    Tractor
    Kubota B1550HSD

    Default Re: Engine swap, good or bad?

    It will probably do the job, but I think you'll find a single cylinder a big disappointment after having a twin.

  4. #4
    Gold Member
    Join Date
    Mar 2009
    Posts
    327
    Location
    New Jermany
    Tractor
    none now

    Default Re: Engine swap, good or bad?

    How bad is the 20? You can get a 'shortblock', basically a new engine minus all the externals & just move over your ignition, induction and tins. That's alot cheaper than buying a whole new engine. A few years ago I shortblocked my friend's Simplicity w/ 11hp B & S for $300 while they wanted close to $700.00 for a complete, ready to bolt on new engine.

    OTOH 3 hp isn't all that much but you will notice a difference in torque VRS a twin, if youare the patient type you should be fine. My buddies 11hp w/ bagger was the same tractor as my sisters 8hp w/ no bagger.

  5. #5
    Platinum Member
    Join Date
    Jan 2008
    Posts
    578
    Location
    SE Ohio & SE Florida

    Default Re: Engine swap, good or bad?

    Even if you have a single and a twin rated at the same HP, the twin will perform better under load. Torque for the twin will be more even over the single per revolution of the engine.

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