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  1. #1
    Chief Petty Officer Jacalore's Avatar
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    Default Most Efficient Cruising RPM?

    I looked around and didn't see this question anywhere else...

    What is the most efficient cruising rpm for a MerCruiser 3.0L 140 w/ Alpha 1?
    And what is redline (with correct prop) rpm?

    Thanks!

  2. #2
    Moderator QC's Avatar
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    Default Re: Most Efficient Cruising RPM?

    We moved this over to non-Repair I/O Jacalore. Been a lot of discussion about this, but the fact is that this is more of a hull issue than an engine RPM issue. Generally speaking though these combos end up most efficient at around 30 MPH which is typically between 3000 and 3500 RPM. Some heavier boats end up being closer to 4000 RPM for an efficient cruise and some faster combos may be down at 2500. It's more about getting the hull running clean, and again that's usually around 30 MPH. Take a cruise over to Boattest.com and study similar boats. You'll start to see what I am talking about.

    Edit: Good discussion here about similar: http://forums.iboats.com/non-repair-...un-606622.html
    Last edited by QC; June 7th, 2013 at 03:38 PM. Reason: added a zero, and an a

  3. #3
    Chief Petty Officer Jacalore's Avatar
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    Default Re: Most Efficient Cruising RPM?

    Muchas gracias, QC!

  4. #4
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    Default Re: Most Efficient Cruising RPM?

    What boat/motor/drive combo do you have?
    2013 Bayliner 255CR
    5.0MPI S/N:2A044802
    http://seawenchnc.blogspot.com

  5. #5
    Chief Petty Officer Jacalore's Avatar
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    Default Re: Most Efficient Cruising RPM?

    Quote Originally Posted by agallant80 View Post
    What boat/motor/drive combo do you have?
    1985 Chris-Craft Scorpion 169 w/ MerCruiser 3.0L 140 w/ Alpha 1

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