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    • Cummins Marine Forum Topics
    • Thinking of re-powering from Cat to Cummins

      This topic has 1 reply, has 2 voices, and was last updated byTony Athens 5 years ago

      September 16, 2018 at 9:34 am Hey All: I’m new to this site. I have a question, I have a pair of T/3208TA 375 Cats w/TD 507 gears with approx. 4k hours. I have an opportunty to replace them with a pair of QSB 5.9 480hp with TD MG5061A 1.54:1 gears @ < 100 hrs. The boat is a 1988 37′ Topaz which I use for charter fishing,approximate displacement of 20k #’s. Im wondering what and if this would be a good move ? I like the idea of the smaller motor (inline) …

      Started by: Kenny Keen in: Boats & Repowers

      1 Reply
      September 16, 2018 at 3:14 pm Post your current gear ratio w/ the CATS , your current WOT RPM and vessel speed, current vessel speed at 2300 rpm, and most important, your current prop specs and engine HP. I seriously doubt you could use a 1.5 R gear. For propping purposes, this engine need to see 3500 RPM. Tony

      Last Post by: Tony Athens posted: 5 years ago

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