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    • Cummins Marine Forum Topics
    • Twin 1988 250hp 5.9 6BTA, what are the optimum RPM's

      This topic has 17 replies, has 5 voices, and was last updated byTony Athens 6 years ago

      May 23, 2017 at 8:18 am Hello all, new guy here. I have a 1988 41ft Defever with twin Cummins, 1000 original hours on both engines. My question is about RPM’s and what should I be running the boat at? Also at what rpm do the turbos kick in? How important is it to run the RPM’s higher for a bit if I’m poking along at 8 knots. Thank you Rob

      Started by: sailusvi in: Cummins Marine Engines

      17 Replies
      June 2, 2017 at 7:11 pm Read , and reread what Don posted……………………………… This is REAL, not a piece of “paper”form of engines tested in a test cell under controller conditions.. You have a boat, not a “test cell” to gauge engine operating parameters….. Understand that this still applies–IMO, more that ever as the HP per liter keeps going up…… Tony …

      Last Post by: Tony Athens posted: 6 years ago

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