Need help with correct prop size

Discussion in 'Gas Engines/Drives/Transmissions/Props' started by JByers, Jun 18, 2018.

  1. JByers

    JByers New Member

    28
    Oct 14, 2008
    Woodstock, Ontario, Canada
    340 Sundancer 2001
    6.2s 320hp
    I have a 2001 34' SeaRay Sundancer with the 6.2 320hp engines, tunnel drives, does anyone know the correct props for this boat. 3 blades or 4, diameter and pitch. Any info would be greatly appreciated.
     
  2. CliffA

    CliffA Well-Known Member GOLD Sponsor

    Dec 29, 2009
    Lake Norman, NC
    2001 Sea Ray 340DA
    Name: 'Happy Place'
    4.5kW West. Generator
    Purchased Nov. 2014
    Fresh Water Use
    Twin Merc. 6.2L (MPI)
    Raw Water Cooled
    V-Drive Transmissions
    by 'tunnel drive' I assume you mean you have V drive transmissions...if so here are the OEM prop specs....

    Sea Ray part number and description:
    Left - 1523513 17"x19"x1.5" L3BMC NIBRAL H/S
    Right - 1523521 17"x19"x1.5" R3BMC NIBRAL H/S

    These are 3 blade props.....

    cliff
     
  3. JByers

    JByers New Member

    28
    Oct 14, 2008
    Woodstock, Ontario, Canada
    340 Sundancer 2001
    6.2s 320hp
    Thanks Cliff, do you know if it's possible to run a 4 blade prop on this boat, every SeaRay in my part of the marina, has a 4 blade prop. I've also heard from another boater with that boat prop combination that he cruises at 4200 rpm's and complained about noise and vibration. Thanks again for the help.
     
  4. CliffA

    CliffA Well-Known Member GOLD Sponsor

    Dec 29, 2009
    Lake Norman, NC
    2001 Sea Ray 340DA
    Name: 'Happy Place'
    4.5kW West. Generator
    Purchased Nov. 2014
    Fresh Water Use
    Twin Merc. 6.2L (MPI)
    Raw Water Cooled
    V-Drive Transmissions
    I have read some posts where members try different props on these boats including 4 blade props.....IMO I think you would get as much or more improvement in getting and staying on plane if you enlarged the trim tabs....these boats came equipped with small tabs for the size/weight of the boat...there are a lot of threads about enlarging the trim tabs in the archives.....

    when I first got my boat I was surprised at the vibration and noise the boat was making while on plane at higher rpm's....however as time passed and I tuned the engines and I tightened door latches and I removed stuff that was lying around loose on the deck and learned how to keep the two engines in sync the odd sounds and vibrations went away....now when I plane everything is smooth and relatively quiet and I love the sound these small block engines make when they are revving at higher rpm's under load....

    personally I am satisfied with the performance of my boat as it is.....I can plane relatively easily with 6 adults on board and full fluids and 'stuff' and cruise all day long around 25 mph at around 4,200 rpms....these engines do rev higher than big block engines to make the same power but they are designed to rev higher....this does not mean they are straining at all....

    however 99% of our boating is slow 'cocktail cruises' at 8 - 10 mph at around 2,000 rpm's......these engines are very good on fuel efficiency especially at lower rpm
    's......the only time I run at WOT is when I want to check the health of the engines and that is only for a minute or so....

    I believe that the Sea Ray engineers are a lot smarter than me so why would I question their decisions and efforts in designing the boat and the drive trains to power them?.....

    I have no interest in cruising at top speed for any length of time so gaining a few extra mph's at WOT means nothing to me....I wanted and purchased a 'cruiser', not a 'go fast wanna be' boat.....

    good luck....

    cliff
     
  5. JByers

    JByers New Member

    28
    Oct 14, 2008
    Woodstock, Ontario, Canada
    340 Sundancer 2001
    6.2s 320hp
    Thanks Cliff for such a personal response, that was the kind of information I was looking for and the cocktail cruises sound great. Unfortunately we are right on Lake Erie and except for the channel, we are at cruising speed most of the time and I'd like to tone down the noise a bit so I don't have to crank the stereo. But I don't want to over prop the boat, I purchased my last boat, new from SeaRay, got caught in 10 and 12 foot waves, in a storm, crossing the lake and the boat was on the verge of stalling out in the hills. I down sized the props the next week, scared the crap out of my wife, we had waves going right over the top of the boat but I can honestly say, SeaRays hold together in a storm. Thanks John
     
    Handsome Transom likes this.

Share This Page

Show Sidebar