420 DA Thread

Discussion in 'Sport Yachts/Yachts' started by Skip, Jan 16, 2007.

  1. Larry

    Larry Active Member

    Oct 19, 2006
    Oakland, NJ
    2004 42 Sundancer
    Hydraulic platform
    Cockpit air
    KVH M3
    450hp Cummins
    I see you have a hydraulic platform with jet ski (I do too), this will also change your loading significantly. You have 500lbs lift plus approx 500lbs ski hanging way aft... I believe I am running 22 x 24 (2650) but remember I am running 450c motors not the 500’s like you
     
  2. brewster16

    brewster16 Member

    312
    Aug 9, 2009
    Long Beach Island, N.J.
    '07 44 Sundancer
    Twin Cummins QSC 8.3
    Larry I don't. But I can tell you the brand is imprinted right on the black plastic manifold itself. It's really nothing more than a black plastic tube screwed into the wall with a bunch of pex fittings screwed to it. Just turn off the 2 valves (hot and cold) that go to it, unscrew it from the wall and unscrew the plastic pex fittings. I Google searched the brand, measured the length of my manifold, matched the image in the picture and ordered it. Perfect fit....no more leak.
     
    Larry likes this.
  3. villain style

    villain style Well-Known Member SILVER Sponsor

    Oct 10, 2006
    Mears Point Marina Kent Island, MD
    2006 44 DA
    QSC 8.3s
    Cummins QSC 8.3s 500HO
    Larry - this is the P/N from a 2006 44
    1772638 MANIFOLD, SEATECH W/8 CLD 4 HOT VALVED
     
    Larry likes this.
  4. swaterhouse

    swaterhouse Active Member

    412
    Jan 7, 2015
    Mattapoisett, MA
    2007 Sundancer 44
    Cummins QSC 8.3

    Congrats on the purchase, these are fantastic boats!


    Your pretty close to where I started at survey, I was able to get slightly more RPM but I had lighter load (zero personal gear, about the same fuel and no water/black water). No matter what you are over propped and need to drop pitch for the long term health of the engines.

    I am now running 22x26 with 0.046" Cup. I would drop the 1" of pitch immediately then watch your burn and/or loads while loaded the way you normally cruise.

    The key is to get all your burn numbers less than the specs for the QSC:

    RPM Gal\Hr
    2600 25.4
    2400 20.1
    2200 15.7
    2000 12.2
    1800 9.4
    1600 7
    1400 5
    1200 3.3
    1000 2.1
    800 1.3

    Obviously the most important range is the cruising range (1800 to 2400).
     
  5. hynespa

    hynespa Active Member SILVER Sponsor

    103
    Jun 7, 2010
    Marina Del Rey, CA
    2005 420 Sundancer
    T-VD-8.1 S HO MerCruiser (T-420 hp)
  6. hynespa

    hynespa Active Member SILVER Sponsor

    103
    Jun 7, 2010
    Marina Del Rey, CA
    2005 420 Sundancer
    T-VD-8.1 S HO MerCruiser (T-420 hp)
  7. hynespa

    hynespa Active Member SILVER Sponsor

    103
    Jun 7, 2010
    Marina Del Rey, CA
    2005 420 Sundancer
    T-VD-8.1 S HO MerCruiser (T-420 hp)
    I got back to the boat this weekend. The new Salon Samsung fold down TV has now been rewired to run directly off of 12V instead of 120V. See original post:

    http://www.clubsearay.com/index.php?threads/420-da-thread.1273/page-62#post-1000978

    Here are some pics:

    1) Screen Shot 2019-02-10 at 7.48.50 PM.png I mounted the ($19.99 from Amazon) "uxcell Power Converter Regulator DC12V(10V~16V) Step-Up to DC19V 8A 152W Waterproof Voltage Convert Transformer" which I purchased back in July - but only finally finished installed and securing today! It is mounted to the ceiling above the fold down TV. Now the Samsung will run off of 12V and so I don't have to worry about always starting the generator to have TV when off the dock! This draw far fewer amps than if I tried to run the TV off an inverter.

    2) Screen Shot 2019-02-10 at 7.54.57 PM.png The converter is powered on/off by the "SATELLITE TV SYSTEM" circuit breaker which is only on when I am on the boat.

    3) Screen Shot 2019-02-10 at 7.57.46 PM.png - With the Apple Lightning to HDMI converter I can play anything from my iPhone / iPad to the fold down galley TV. This includes any movies downloaded, or even showing Club Sea Ray!

    My next step is to install the TOSLINK to RCA converter that @ttmott recommended so that I can get the audio out from the TV into the Fusion stereo.
     
    villain style likes this.
  8. Caseclosed

    Caseclosed Member

    121
    Jul 17, 2012
    SW Florida
    2007 44 Sundancer QSC 500 West marine 310 Dingy Raymarine Hybrid touch KVH
    Cummins QSC500 Vdrive
    Happy to report moving the boat from Ft lauderdale to my home port Punta Gorda fl this weekend went very well encountered 3 hrs of 3-5 foot seas and I am very impressed with how the boat performed in these conditions.13 hr total run time burned a total of 422 Gal. with the Gen set running.Averaged 32.4 Gal per hr mostly running 2010-2150 rpm.Average speed was between 20 kts -21.5.I think I can improve the fuel burn by having the Props worked.
     
    importmonkey and Blueone like this.
  9. Caseclosed

    Caseclosed Member

    121
    Jul 17, 2012
    SW Florida
    2007 44 Sundancer QSC 500 West marine 310 Dingy Raymarine Hybrid touch KVH
    Cummins QSC500 Vdrive
    Swaterhouse Thank you for your prop specs.What is your WOT rpm with these props.
     
  10. swaterhouse

    swaterhouse Active Member

    412
    Jan 7, 2015
    Mattapoisett, MA
    2007 Sundancer 44
    Cummins QSC 8.3
    My WOT is 2665 RPM which is the max the governor will allow. At 2665 I am running at about 93% load with full fuel and water and loaded for a long weekend.

    Think you said the boat was fresh water until recently. I suggest you get the aftercoolers inspected and cleaned sooner rather than later. If you can't take them apart because of corrosion they need to be replaced. It's something that should be done every two years. If your handy you can DIY for the cost of some grease and o-rings. The Cummins o-rings are like $400 but you can get them at sbmar.com for $75. This is the weak link in the QSC.
     
    Jaybeaux and Buyajet like this.
  11. Caseclosed

    Caseclosed Member

    121
    Jul 17, 2012
    SW Florida
    2007 44 Sundancer QSC 500 West marine 310 Dingy Raymarine Hybrid touch KVH
    Cummins QSC500 Vdrive
    Thanks Yes I plan on doing after coolers and all heat exchanges and coolers.running temps were steady 175 for the entire trip.
     

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