280ss Prop

Discussion in 'Gas Engines/Drives/Transmissions/Props' started by toger13, Feb 21, 2015.

  1. toger13

    toger13 New Member

    5
    Feb 21, 2015
    uk
    1998 280 SunSport
    350 MAG Bravo 1
    Hi guys

    Been reading the forum for afew months now but this is my first post so go easy lol

    I have just bought a 1998 Sea Ray 280 sunsport with twin 350MAGs in from a place in spain, the boat is spotless inside and out and has had very little use unfortunatly I dont think is has been as well maintained as it looks, this isnt really an issue as I can do this stuff my self

    First issue is there is a delay on both engines if the throttle is floored and and is only pulling 4000-4200 rpm WOT it sounds to me like them map sensors are knackerd but I am going to do a comp test and full service first plugs leads cap and arm etc first as I dont know when they were done so I know the engines arnt 100% as they are although they do sound healthy if you know what I mean

    Now the main issue its getting huge amount of cavitation/prop slip even if turning pritty steady you have to pull the engines back and turning round quick to get a skiier is a pain, now I have got it out of the water and back to the uk I found it has got the wrong props on

    Its got 350 mag mpi with bravo 1 drives 1.5 ratio

    When it was new it should have had 3 blade laser II 13-7/8 21 inch pitch
    some one has painted the props on it with thick black paint which wont be helping so I have cleaned it off and found it has

    A pair of Revolution 4 14-5/8 17 inch pich

    I dont know why these have been fitted but there seems a huge difference between a 3 blade 21 pitch and a 4 blace 17 pitch

    Laser II`s have been out donkeys should I put a new set of these on as it should or is there something more modern? the forums say this boat should do 60mph on flat water trimmed apropriatly but I do want to pull skiers too

    As it is now it easy pulls 2 skiers out but it should with a 17 on it lol

    sorry for the babble

    Thanks
    Si
     
  2. 2000SEARAY280SS

    2000SEARAY280SS Member

    919
    May 7, 2007
    Potomac River
    ArrowCat 30ES
    Twin Verados 250
    i found this for a 2000 280SS in my archives
    2000 280SS Twin 350 MAG MCM Stern Drive (T-300 PHP) Bravo 1 1.50:1 (Corsa Exhaust) 15.25 x 22

    hope it helps

    i found this several years ago on the seary site under archives.
     
  3. Robert Conaway

    Robert Conaway New Member

    5
    Dec 1, 2020
    2001 searay 28 ss
    383 mag
    Just wondering what prop u ended up with just got the same boat
     
  4. blaster

    blaster Well-Known Member SILVER Sponsor

    May 23, 2011
    potomac river
    2010 sea ray 205 sport
    F-250 CCLB 6.2 4x4 3.73 rear.
    Mercruiser 4.3 mpi alpha 1.62
    Was the laser 2 the stock prop? I’m not sure but it’s mostly an outboard prop and probably doesn’t get the best traction. Sure it wasn’t a mirage propeller?

    Are you trimmed out at WOT and only getting 4200? That’s lugging pretty hard on the motors.

    The original owner was probably looking for more stern lift with those four blade props but who knows?

    holy old thread resurrection!
     
  5. Robert Conaway

    Robert Conaway New Member

    5
    Dec 1, 2020
    2001 searay 28 ss
    383 mag
    Lol I know just pick up a 01 28 ss new to me has twin 383 mpi mags with a 19 pitch prop Believe the old owner never played a played Around with different props I want to say the original motors were 5.0 I do have bravo one drives
     
  6. blaster

    blaster Well-Known Member SILVER Sponsor

    May 23, 2011
    potomac river
    2010 sea ray 205 sport
    F-250 CCLB 6.2 4x4 3.73 rear.
    Mercruiser 4.3 mpi alpha 1.62
    Bravo drives do best with a wider diameter propeller than a laser 2. What is the diameter of your 19” props? What do you get for WOT with them? Sounds like you are in the proper range of pitch.
     
  7. Robert Conaway

    Robert Conaway New Member

    5
    Dec 1, 2020
    2001 searay 28 ss
    383 mag
    4400 rpm just picked up the stock props 15.25 22 pitch gonna give it a try seems like they put 3 different size props on that boat
     
  8. Shenanigans77

    Shenanigans77 Well-Known Member GOLD Sponsor

    262
    Feb 17, 2020
    Lk St. Clair
    2003 320 Sundancer
    Twin 6.2 Mercruiser Bravo III
    My previous boat was a 2000 280ss with 350 mags. I had 19p revolution 4’s on it. Would jump out of the hole like a scalded dog, hit 55mph and right in the correct wot rpm range.
     
  9. SteveRuss

    SteveRuss Member

    191
    Jan 25, 2011
    Amityville, New York
    2000 280 Sunsport
    Twin 5.7L EFI w/Bravo I Drives
    The stock props on my 280 were 19P Mercury Vengeance props. I replaced them with 17P Mercury Mirage props at the recommendation of a prop expert. Said the 280 was too much boat for Vengeance props. Needed something with a larger blade surface hence the 15.5X17p Mirages. Went down in pitch because I went up in diameter. Great hole shot and runs right around 4500 - 4600 at wot.
     
  10. Robert Conaway

    Robert Conaway New Member

    5
    Dec 1, 2020
    2001 searay 28 ss
    383 mag
    Thanks guys just trying to figure out what you guys a running I did get the 15.25 22p props don’t know much about 4 blades or am I wasting on them lol
     

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