RPM Question

Discussion in 'Gas Engines/Drives/Transmissions/Props' started by Shark, Sep 6, 2020.

  1. Shark

    Shark Active Member

    142
    Jun 16, 2020
    Sayville, NY
    2001 290 Sundancer
    Twin 5.0L EFI w/Bravo II Drives
    I have a 2001 290 Sundancer with twin 5.0L EFI with 395 hours. Both engines have been running great, since we got the bought in July. Today, took about twice as long to get up on plane, and the starboard engine was stuck at 3000 rpm at WOT (port was around 4500 and climbing). Once we finally planed off, the rpms got much closer (around 4000 & 3600). We usually cruise at around 3600 rpm on both engines, and they usually ramp up to speed together, with slight variations. The only difference I can think of is the amount of people/weight we had on board today. Probably about 500lbs more than usual. I can see that causing the slow planing, but the 3000 rpm with the throttle floored seems very strange. We’re going back out tomorrow, with our usual crew & weight, so I’ll see what happens. Do you guys have any suggestions or ideas? Thanks, Bob
     
  2. Espos4

    Espos4 Well-Known Member

    Jan 1, 2017
    Long Island NY
    2007 240 Sundeck
    350 MAG Bravo 3 W/DTS
    See how it performs tomorrow with the usual crew and report back.

    If it’s still sluggish, there are many possibilities.
    From easier to more difficult, here are some possibilities:

    Growth on the hull
    Damaged prop
    Rope or something caught in the prop
    Fuel or ignition issues
    Loss of Compression on one or more cylinders.
     
  3. Shark

    Shark Active Member

    142
    Jun 16, 2020
    Sayville, NY
    2001 290 Sundancer
    Twin 5.0L EFI w/Bravo II Drives
    Ok will do, thanks. My first thought was prop or something in the prop. I’ll see how it runs tomorrow.
     
  4. Shark

    Shark Active Member

    142
    Jun 16, 2020
    Sayville, NY
    2001 290 Sundancer
    Twin 5.0L EFI w/Bravo II Drives
    Went out today, with just my son, and we planed off normally, and both engines ran great. I guess the additional people and weight really threw off the starboard engine. Unless there was something else going on that somehow corrected itself. Either way, it was a huge relief!

    I’ll keep an eye on it. Thanks for your suggestions Espos.
     
  5. Espos4

    Espos4 Well-Known Member

    Jan 1, 2017
    Long Island NY
    2007 240 Sundeck
    350 MAG Bravo 3 W/DTS
    Sounds good. Nice day out today, we spent a few hours at Davis Park.
     
  6. Shark

    Shark Active Member

    142
    Jun 16, 2020
    Sayville, NY
    2001 290 Sundancer
    Twin 5.0L EFI w/Bravo II Drives
    Oh nice. We were on the Connetquot River. Heading to Watch Hill next weekend.
     
  7. Espos4

    Espos4 Well-Known Member

    Jan 1, 2017
    Long Island NY
    2007 240 Sundeck
    350 MAG Bravo 3 W/DTS
    Enjoy!
     
  8. Shark

    Shark Active Member

    142
    Jun 16, 2020
    Sayville, NY
    2001 290 Sundancer
    Twin 5.0L EFI w/Bravo II Drives
    Thanks!
     

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