Prop shop called with some bad news

Discussion in 'Gas Engines/Drives/Transmissions/Props' started by markrsimon, Jan 21, 2021.

  1. markrsimon

    markrsimon Active Member

    170
    Sep 1, 2018
    Cleveland, OH
    92 Sea Ray 400 Express
    454 Mercruiser
    One of the blades has a crack in it, in the same place where it appears it was welded previously (by the PO) and the tip has lost a lot of a material during the cleaning process. They are recommending a new prop and suggested switching from a 3 blade to a 4 blade. Factory spec was 20x20c

    For those of you who have a 400 Express (92 era, Gas 7.4) and 4 blade props, what size/pitch are you running?
     
    Express 390 likes this.
  2. Express 390

    Express 390 Active Member

    622
    Sep 14, 2018
    South Shore of Long Island NY
    1986 SeaRay 390 EC
    1993 SeaRay 290 DA single 7.4 /Bravo 2
    1992 SeaRay 230 DA 4.3LX Alfa drive
    Twin 454 Crusaders inboards 4 blades
    I have an 1986 390 with 454's went from three blade 20 x 19 to 4 blade 20 x 18 runs great!
     
  3. bahamabreisus

    bahamabreisus Well-Known Member

    Oct 25, 2007
    Hampstead NC
    500 dancer, previous 420,390,300 dancers
    detriot 8v92
    If you have a good prop shop, they would be a great resource to answer your questions. You can also call Sea Ray, they can tell you what prop came on that boat.
     
  4. markrsimon

    markrsimon Active Member

    170
    Sep 1, 2018
    Cleveland, OH
    92 Sea Ray 400 Express
    454 Mercruiser
    I'm not sure if I have a good prop shop of not, which is why I'm trying to gather more information on what real world information is out there. From the factory, the boat has 20x20cupped. If you know of a good prop shop in CLE OH, please let me know.
     
  5. 2016FLD

    2016FLD Active Member

    150
    Apr 3, 2020
    Tarpon Springs, FL
    1985 Sea Ray 260 Sundancer
    5.7 Mercruiser
    Ken at Prop Gods knows more than most, recommend talking with him. 941-735-5808, https://propgods.com/, if you don't like the way a prop performs, he'll exchange it for another for a small fee.

    When I needed a new prop last year, I switched to a 4 blade cupped at his recommendation, works great. My boat is smaller than yours, 260DA, single stern drive, with the 4 blade it gets out of the whole and up on plane much quicker with very little bow rise and I can stay on plane 3-5 mph lower in most seas. Last time in the shop my mechanic commented he was impressed how well it performed.
     
    markrsimon likes this.
  6. Strecker25

    Strecker25 Well-Known Member SILVER Sponsor

    Nov 20, 2014
    Rochester, NY
    2002 410DA
    Caterpillar 350HP 3126
    North coast prop tech is about an hour from you, I sent my props there on the recommendation from @my3sons and while I can’t comment on performance just yet since were still laid up, Ray was a pleasure to work with and they have propscan in house which was important to me. They recommended 21.5” of pitch for us and they measured exactly that after the work.
     

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