Boat props

Discussion in 'Classic Sea Rays' started by SteveT, Aug 8, 2018.

  1. SteveT

    SteveT New Member

    Mar 3, 2014
    Sand Lake NY
    1976 SeaRay srv 200 closed bow
    302 Ford V8 888 Mercruiser
    I have a dilemma I have a 1976 Sea Ray 20 foot I/O 888 Mercruiser 302 Ford and I am trying to figure out the right prop I want to get back to full throttle rpm of 4200 and boat speed of 41 mph I currently run a 15 1/2 x 18 prop what do I need to do ?
  2. NorCal Boater

    NorCal Boater Well-Known Member SILVER Sponsor

    Jan 24, 2008
    Covington, LA
    No engines
    The first thing you should do is find a reputable, experienced prop shop in your area. They should be able to help. You don't say what the current WOT rpms and speed are but from what you are asking it looks to me like you may be "over-propped. In other words, your prop may have too much pitch and possibly the diameter is a bit too large. However, I am not familiar with the gear ratio of that engine/outdrive package. Also prop pitch is usually in odd number i.e. 15", 17" 19" but not always.

    Look for a place in your area that sells and repairs props and they will be your best bet to get on the right track.
    Aljackson likes this.
  3. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor GOLD Sponsor

    Apr 21, 2009
    Definitely need more information to be helpful. BUT... are you saying that you have personally run that boat and achieved 4,200RPM and 41mph? What has been done to the boat since then and what prop were you using at that time? Their website has been flaky, lately, but there is a Prop Matrix on SR's website that lists original prop size and gear ratios - that would be a good starting point. You could also contact SR to ask them. Shawn's recommendation is a good one, as well.

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