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Are Harly Davidson engines DOHC or SOHC?

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  • 1 month ago

    "OHC" = Over-Head Cams meaning the cams are in the cylinder head. Harley engines are push-rod: the cam shafts are located in the crankcase, below the cylinders, and uses rods to push open valves in the head.

    Harley makes both singe and twin (dual) cam engines. The have the Evolution ("Evo") on their Sportsers, and the Milwaukee-Eight on their "big twin" bikes (Dyna, Softtail, touring/baggers), both are single cam. The Milwaukee-Eight replaced the Twin Cam engine on their "big twin" bikes 2016-18; as the name suggests, the Twin Cam had two cams, but is still a pushrod.

    Harley does have a few blacksheep: Revolution X motor is a SOHC used on the Street series bikes. And the V-ROD which is not only DOHC, but liquid cooled, a cardinal sin for Harley purists. I think the VROD was discontinued in 2017.

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  • 2 months ago

    Neither........

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  • adam
    Lv 4
    2 months ago

    History lesson. Long before the big 4 from Japan HD had DOHC race machines in the 1920s. Race bikes only. All other big twins have been pushrod actuated overhead valve with the exception of flathead models and they of course were side valve. The 500 CC and 750 CC street models are both Overhead cam. The Vee Rod now a discontinued model was an overhead cam model. The M8 they make now is still a pushrod model but at least it has a 4 valve head. And its liquid cooled. Change happens very slowly at the motor company.Sportsters have 4 cams but still use pushrods. 

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    • adam
      Lv 4
      2 months agoReport

      I always hoped they would give us a production VR 1000 but it never happened . Miguel Duhamell got that race bike to place on the podium several times, There could have been a street legal HD sport bike!!!

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  • Most of the big twins are push rod engines.

    some of the water cooled v twins have double over head cams( V rod).

    some have single over head cams (500-750 street)

    Some of the 65 year old & older ones  were flat head side valve models.

    Some were even 2 cycles with no valves or cams.

     Sportys actually have1 cam gear under each of the push rods so 4 individual cam gears instead of a camshaft.

    So you name it & Harley has made it.

    • adam
      Lv 4
      2 months agoReport

      HD made DOHC race bikes in 1920s

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  • 2 months ago

    Vague much? The HD flatheads were side valve with no overhead cams. Zero--count 'em--zero overhead camshafts... assuming you mean the Harley-Davidson flatheads.

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    • adam
      Lv 4
      2 months agoReport

      experimental Overhead cam models in the 70s but they never made it into production.

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