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Changing a reverse rotating motor to a standard rotating motor.

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  • Changing a reverse rotating motor to a standard rotating motor.

    To make a long story short. Last yr I built this(Completed Boat Projects

  • #2
    Re: Changing a reverse rotating motor to a standard rotating motor.

    Reverse rotation cams use a gear drive so the cam, distributor, and oil pump all turn in the standard direction. Therefore the standard distributor and oil pump are used. You must use a standard cam and timing chain set up. You absolutely will change front and rear crank seals or they WILL leak. Starter is an issue, and the drive on that engine if you are taking it too will have to be changed. Volvos are very easy to change for engine rotation. Quite frankly I'd keep looking.

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    • #3
      Re: Changing a reverse rotating motor to a standard rotating motor.

      I already bought the two motors, guy was basically giving them away. Two SBC with all running gear (minus transmission and outdrives) for 200 bucks. Hard to say no.

      My thought is take the cam, and timing chain assuming they measure correct and look good still and install them into the reverse motor making it a standard rotation motor.

      The thing I can figure out and will do more checking tonight is why both motors when hooked up to a battery would spin the same direction. I'm wondering/thinking that the motor are standard rotation and the reverese was done in the transmission. From my reading this is a standard practice.

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      • #4
        Re: Changing a reverse rotating motor to a standard rotating motor.

        Originally posted by TurboM700 View Post
        why both motors when hooked up to a battery would spin the same direction.
        Occam's razor says the simplest explanation is usually the correct one. That would be: If the starters spin both engines in the same direction (ccw at the flywheel) then they are both standard rotation. Now I believe (and I may be wrong) that both distributors would turn in the dame direction CW, so check the wiring on the distributors my quick research says 1-2-7-5-6-3-4-8 for the reverse rotation scb.
        Terry
        87, 4WINNS H 190
        470/Alpha I

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        • #5
          Re: Changing a reverse rotating motor to a standard rotating motor.

          I will check here in a few hrs but the first number on the manifold was 8 then 2. I suppose it possible that they put a Reverse rotation intake manifold on a standard engine.

          I guess I will pop the timing cover off tonight and see if there is gears or chain in there.

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          • #6
            Re: Changing a reverse rotating motor to a standard rotating motor.

            Originally posted by TurboM700 View Post
            I guess I will pop the timing cover off tonight and see if there is gears or chain in there.
            Easiest way to tell for sure.

            LK

            1997 Sea Ray Sundancer 250 5.7EFI / BIII

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            • #7
              Re: Changing a reverse rotating motor to a standard rotating motor.

              Looks like there both standard roatation motors. The numbers I was reading on the motor that I was TOLD was a reverse rotation motor were a GM part number for the intake. OOOPPS Got home and looked closer and they both have the same firing order stamped into the intake.

              Now lets hope atleast one of these motors turns out to be good. I started stripping parts off my 305 that had the cracked block and putting them on the 350 to see if I can get them to run.

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              • #8
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                Re: Changing a reverse rotating motor to a standard rotating motor.

                Well there you go. Good luck keep us apprised!

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