Repower SeaCraft 20

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  • Repower SeaCraft 20

    I recently repowered my 1974 20’ SeaCraft with a 175 HP Mercury 175 four stroke. I opted to try a prop I already had, a 17p Revolution 4 blade. Hole shot is great but I only get 5200 RPM (target is 5000-6000) so definitely on the low end. How much top end RPM would I gain by going to an Enertia 17p?

  • #2
    what speed are you getting at 5200 RPM? is the boat loaded up like you actually plan to run it ?

    Ken Reeves
    [email protected]


    • #3
      Yes full fuel (48 gallons) some tackle, two people. Normal load. Getting 43 mph on the gps.


      • #4
        How is the engine mounted? What hole? And can you show a picture of the engine down, antiventilation plate parallel with the keel and a straight edge coming off the bottom of the keel back to running parallel with the antiventilation plate.
        Click image for larger version

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        • #5
          Ok, RPM range of the 175 is 5000-5800
          Your at 5300 and 43 MPH, 5% slip, not bad

          The Enertia or Q3 would run very well on that boat. We could try a 17 and see if you gain any speed.
          If you are still low on RPM with the 17, then just drop to a 16

          Ken Reeves
          [email protected]