Desireable Max Operating RPM

Discussion in 'Outboards' started by Jango, Apr 10, 2009.

  1. Jango
    Joined: Aug 2005
    Posts: 519
    Likes: 7, Points: 0, Legacy Rep: 63
    Location: Mid Atlantic

    Jango Senior Enthusiast

    I have a 97, Evenrude 90HP V4, Max Operating range is supposed to be 4500 - 5500 rpm.
    Am currently turning 4800 rpm max with normal lite load, 1/2 tank of fuel and Driver only. Should I reduce pitch 2" to increase max rpm?
    I'm told higher rpm is desireable to prolong engine life or is 4800 High enough?
    Thanks, Jango
     
    Jango, Apr 10, 2009
    #1
  2. tom28571
    Joined: Dec 2001
    Posts: 2,474
    Likes: 117, Points: 63, Legacy Rep: 1728
    Location: Oriental, NC

    tom28571 Senior Member

    You are in Evinrude's desired range. Most likely your speed is more now than it would be with a lower pitch. I would not change it unless you operate with a heavier load a lot.
     
    tom28571, Apr 10, 2009
    #2
  3. powerabout
    Joined: Nov 2007
    Posts: 2,944
    Likes: 67, Points: 48, Legacy Rep: 719
    Location: Melbourne/Singapore/Italy

    powerabout Senior Member

    I would lower the pitch.
    You say light load and you are only 300rpm over the low end.
    One tank of bad gas a full esky a head wind and ka boom!
     
    powerabout, Apr 11, 2009
    #3
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