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    • Lost speed after Prop scan

      This topic has 1 reply, has 2 voices, and was last updated byTony Athens 4 years ago

      August 19, 2019 at 7:17 am Good morning guys. I have a Sea Ray 420 Sundancer with 6CTA 8.3-M3. I hit a log and got some vibration in the port prop. Pulled the boat and took both props in for scanning and repair. Prior to the log my max rpm is 2,650. I cruise at 2,150 and gps says speed is 23.5 knots. Props are 22×24…both were out and after scanning pitch calculated out at a little over 24. Now that they were both brought back to 24 my max rpm is still 2,650 a…

      Started by: Dan in: Cummins Marine Engines


      1 Reply
      August 25, 2019 at 8:20 am The guy that did the props? Good feedback from others? What is your no-load WOT RPM? Ever checked both tachs in neutral at 2200-2300 RPM with a photo tach? That’s where I’d start………………………………Happen to have a boost gauge ? That’s really the only way to see how the engines are loading.. Tony

      Last Post by: Tony Athens posted: 4 years ago

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