Wide open

Discussion in 'Newbie Lounge - NEW' started by billnpat, Dec 29, 2009.

  1. billnpat

    billnpat New Member SILVER Sponsor

    Nov 15, 2009
    Lindenhurst N.Y.
    Twin-Zeus-Cummins QSC 600 (T-574 hp - 420 kW) Zeus Propulsion includes Helm joystick, Onan 21.5Kw di
    Twin-Zeus-Cummins QSC 600 (T-574 hp - 420 kW) Zeus Propulsion includes Helm joystick, Skyhook® Stati
    How many boaters go wide open speed for more than a few minutes on say a boat like mine...???
    i know they say to open up the car once in a while to clean it out etc, does the same go for a boat....??
     
  2. skibum

    skibum Well-Known Member

    Jul 30, 2007
    Perry Hall, MD
    2005 Sundancer 260
    496 Magnum HO
    I did it 3 times last summer. About 30 seconds or so each. I have owned my boat 2.5 years now, and I still have no idea how fast she really is. She's been above 42 still gaining speed all 3 times. Fast enough for me...
     
    Last edited: Dec 29, 2009
  3. billnpat

    billnpat New Member SILVER Sponsor

    Nov 15, 2009
    Lindenhurst N.Y.
    Twin-Zeus-Cummins QSC 600 (T-574 hp - 420 kW) Zeus Propulsion includes Helm joystick, Onan 21.5Kw di
    Twin-Zeus-Cummins QSC 600 (T-574 hp - 420 kW) Zeus Propulsion includes Helm joystick, Skyhook® Stati

    42 is fast enough..not sure if thats safe for me.maybe 35
     
  4. Quint4

    Quint4 Well-Known Member TECHNICAL Contributor SILVER Sponsor

    Oct 6, 2006
    S.W. Ohio
    330 Sport Bridge
    5.7 MPI 350 Merc Bluewaters
    I run WOT a few times a season to confirm my RPMs are still in spec and my top MPH is normal. I would not run WOT for more than a few minutes personally.
     
  5. cpt. sundancer

    cpt. sundancer New Member

    273
    Oct 23, 2009
    red wing,mn.
    1981 sundancer 260/425 h.p.
    merc.355 ci, B&M blower
    I would be happy with 35-38 WOT. can only get to about 27 4100 rpm but changing props so we will see come spring:thumbsup:
     
  6. Stray Cat

    Stray Cat Active Member TECHNICAL Contributor

    Oct 4, 2006
    Pool 10 Guttenberg, IA
    2006 300DA Sundancer
    350 Mags / Bravo III
    I'll run mine up to 4800 rpm (not WOT for a 2006 350 Mag) for a few miles a couple of times during the summer. Most of my cruising is done at 3500 to 3650, plus with electronic controlled fuel and ignition systems, I'm not sure if it really is necessary to firewall the throttles all that frequently. I will say, that 4800 really brings a silly smile on my face.
     
  7. billnpat

    billnpat New Member SILVER Sponsor

    Nov 15, 2009
    Lindenhurst N.Y.
    Twin-Zeus-Cummins QSC 600 (T-574 hp - 420 kW) Zeus Propulsion includes Helm joystick, Onan 21.5Kw di
    Twin-Zeus-Cummins QSC 600 (T-574 hp - 420 kW) Zeus Propulsion includes Helm joystick, Skyhook® Stati
    Thanks .....My engine tags list a 4400-4800 max rated speed, although the survey reports it attained a 5200 rpm via the vessels tachometer during the survey.
    Note: To verify tach accuracy.
    is one of the the things to fix according to the survey report...
     
  8. Uplate

    Uplate New Member

    977
    Oct 13, 2008
    Nashville, TN. Percy Priest Lake
    1998 Sea Ray Sundancer 310
    Westebeke 4KW Generator
    Twin 5.7 Mercruiser Carbuerated.
    Alpha 1 Drives
    I usually take it to WOT (about 4500 RPM) everytime I go out to make sure all is well. I always use WOT to get on plane and then back off after a few minutes.

    Asked my mechanic about it, and he said they are designed to operate at any throttle speed for as long as needed. No problems with running all day at WOT (according to him), other than fuel consumption. He has been a boat mechanic for over 30 years and an authorized Sea Ray mechanic as well. So he has my trust.

    Personally, I like the feeling of a boat this size skippin along at 35 mph.

    I seldom run my car at WOT , unless I want to find myself at 150 mph. Short bursts seem to clean it out though.
     
  9. Stray Cat

    Stray Cat Active Member TECHNICAL Contributor

    Oct 4, 2006
    Pool 10 Guttenberg, IA
    2006 300DA Sundancer
    350 Mags / Bravo III
    Depending on your prop set up, 5200 wouldn't be out of the question...
     
  10. Four Suns

    Four Suns Head Pot Stirrer TECHNICAL Contributor

    Oct 4, 2006
    Williamsburg, VA
    2003 480 DB
    Zodiac ProJet Dinghy
    Yamaha 110vx WaveRunner
    QSM-11 Diesels
    Your mechanic is an idiot.
     
  11. BonBini

    BonBini New Member

    685
    Sep 28, 2009
    Great Lakes
    88 268
    7.4L Alpha One
    Back in the day of leaded gasoline, ignition points and carburators a combustion chamber would soon cake up with deposits and such from just putsing around. Opening her up now and then would clear out alot of these deposits but not all.

    Todays fuels are certainly alot cleaner and leave very little deposits behind. And when combined with fuel injection like your boat I don't think opening her up to clean things out is as effective as it was back when since there isn't much to clean out (providing your engines are runing with out issues).

    On the other hand one like me certainly does like to turn the horses loose now and then just to make sure there all there. ...Ron
     
  12. katricol

    katricol Active Member SILVER Sponsor

    Mar 4, 2008
    LONG ISLAND SOUND
    2000 540DA
    CAT 3196 660 HP
    Hmmmm....
     
  13. billnpat

    billnpat New Member SILVER Sponsor

    Nov 15, 2009
    Lindenhurst N.Y.
    Twin-Zeus-Cummins QSC 600 (T-574 hp - 420 kW) Zeus Propulsion includes Helm joystick, Onan 21.5Kw di
    Twin-Zeus-Cummins QSC 600 (T-574 hp - 420 kW) Zeus Propulsion includes Helm joystick, Skyhook® Stati
    On the other hand one like me certainly does like to turn the horses loose now and then just to make sure there all there. ...Ron

    I like that :thumbsup:
     
  14. BonBini

    BonBini New Member

    685
    Sep 28, 2009
    Great Lakes
    88 268
    7.4L Alpha One
    4-Suns ... OMG. I agree that mech is an idiot. Because these boat engines just don't have the oil capacity to run at rated for long periods. With no oil cooler that 5-7 quarts would be cooking for sure after awhile. ...Ron
     
  15. I run my girls at WOT for 30 to 40mins with no ill effect.:thumbsup:. If they are going to self destruct. They're going to do it at lower RPM's also. !!. :smt001. Heres the girls that have NEVER been apart in 22yrs.. :smt038[​IMG]
     
    Last edited by a moderator: Dec 29, 2009
  16. keokie

    keokie Well-Known Member

    Dec 27, 2006
    Arizona
    2002 310 Sundancer, Westerbeke 4.5 Genset
    496's, Bravo III's, 2.2:1 Gears
    The stresses on the components in an engine go up with rpm and load. I agree with Gary that the said mechanic is an idiot.

    Boat engines are typically more robust than their auto counterparts, but they are not invincible. Gel coat is designed to stand up to the effects of sun and the weather, but a boat that is waxed and has limited exposure to the sun will have nicer, longer lasting gel coat.

    Wayne, be careful. Just because those motors have not come apart, doesn't mean they won't.

    I run mine to WOT occasionally to verify rpm, oil pressure, speed, etc., but that takes less than a minute.

    Nice to hear from you, Gary.
     
  17. Well with that way of thinking. If the dog didn't stop to take a sh*t he would of caught the rabbit then ?? . I'm not worried about the girls. :thumbsup:. They still hold 40psi oil pressure all day long.:smt038
     
  18. 2000SEARAY280SS

    2000SEARAY280SS Member

    919
    May 7, 2007
    Potomac River
    ArrowCat 30ES
    Twin Verados 250
    If she's good she'll go if she ain't she'll blow is the old saying. The problem I see is the blow can go right through the bottom of your boat. To each his own. The engines on the boat running at WOT for long periods of time ( more than a few minutes) is asking for trouble in my estimate.
     
  19. Away Point

    Away Point New Member

    290
    Apr 24, 2009
    Lake St. Clair, MI
    330 Sundancer
    Big, Gas Lovin', American V-8's :-)
    The way I see it, if WOT were a no extra strain proposition, we'd all run everywhere instead of walking. [​IMG]

    I rarely go WOT. As others have said, only periodically as a systems check.

    My 330 tops out at 35 or so.
     
  20. My tug tops out at 51.9 by GPS. I'll see if i can find the pic of that. :grin:
     

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