200xs ROS....prop learning.

Discussion in 'Propellers' started by ROBERT CROSS, Jul 13, 2017.

  1. ROBERT CROSS

    ROBERT CROSS Well-Known Member Supporting Member

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    Found out from Thom at Hydromotive why the new 25p Q4 OT Round Ear has a slower hole shot than the 24p Round Ear on the 225x PM.

    The new ROS had an open exhaust 'snout', 'cuz it was set up for an 'over hub' prop.
    The 25p is a thru hub prop and requires the exhaust to optimize performance.
    Checked the parts manual and sure enough both plates are offered....I just fabricated an aluminum plate and installed it above the hole'e one.
    [​IMG]
    [​IMG]

    Will update performance this weekend.......if the weather co-operates.o_O
     
  2. pkstv

    pkstv Active Member

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    That's really going to make that motor a lot quieter . That's the part I like , Loud Tuned Power !!
     
  3. 90 5.0

    90 5.0 Active Member

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    Interesting, my 26 q IV ot holeshots at least as hard if not harder than my 26 offshore cut chopper on my PM on a 15"'offshore mid with exhaust open
     
  4. xb03

    xb03 Active Member Supporting Member

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    Thats what I like about an offshore mid, you can tune it to your liking. I made a solid plate as well, but ended up with 5-1/2inch holes. Most of the time I dont run it because it doesnt sound as cool.
     
  5. ROBERT CROSS

    ROBERT CROSS Well-Known Member Supporting Member

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    Is it the 'round ear'?

    Thom said it's the OT round ear that is effected....the one on the right.
    [​IMG]

    Funny thing.....Even with the open plate the Opti is a lot quieter that the PM was.:confused:
    Smoother with a lot less vibration too.

    Hope to ck'r out tomorrow & Sunday.
    Bob
     
    Last edited: Jul 14, 2017
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  6. ssv1761982

    ssv1761982 Active Member Staff Member

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    I thought the round ear was better suited to the 21 footers. The one on the left is what they made their name with on the 2003s.
     
  7. ROBERT CROSS

    ROBERT CROSS Well-Known Member Supporting Member

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    The one pictured is the 24p Thom originally recommended for GS#1 with the 225x PM, it was a real hoot.

    He said the 25p should work great with the mid-range punch of the 200XS.
     
  8. 90 5.0

    90 5.0 Active Member

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    No not a round ear, run the one on the left.
     
  9. Lotus 50

    Lotus 50 Well-Known Member

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    200XS has 1.75 gears? Does that affect bottom end much?
     
  10. ROBERT CROSS

    ROBERT CROSS Well-Known Member Supporting Member

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    Our '13 ROS has 1:87...I believe once I get it dialed in it will be at least as good as our 225x PM was with the 24p...if not better. fullsizeoutput_15cc.jpeg

    fullsizeoutput_15cb.jpeg
     
  11. pkstv

    pkstv Active Member

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    Hey Bob how'd those props work on GS #2 ? Any updates on hole shot performance after the exhaust snout block mods?
     
  12. ROBERT CROSS

    ROBERT CROSS Well-Known Member Supporting Member

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    The 25p is much better with the 'snout' plate installed, no holes. I'm debating if I want to drill a few. I may end up with a few different plates just to make the evaluation easier. I'm not very consistent though, without the stainless trim gauge and paying more attention to the jack-plate the DW gets pretty annoyed with all the stop & go's.....

    I haven't aired out the 28p yet....78mph has been as far as I've gotten with the 26p Q4.
    I'm not as brave as I once was, but I'm as brave once as I ever was......;)
     
  13. pkstv

    pkstv Active Member

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    That's progress it sounds like , keep at it and let us know . I bet it's a lot quieter now . Easier to ride and talk to each other too .
     
  14. ROBERT CROSS

    ROBERT CROSS Well-Known Member Supporting Member

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    It is very quiet...funny thing is even without the block-off plate the 200xs is a lot quieter that the 225x PM was at the same speed.
     
  15. pkstv

    pkstv Active Member

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    Yeah we had one here at the boat shop we ran one day and couldn't believe how quiet the little motor was with that much power . It had the snout opened all the way too ! Loved how it started and idled ! Sounds like a motorcycle motor !
     
  16. aeneas

    aeneas Active Member Supporting Member

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    The gen II 200xs is 1,75:1 unless you have changed gears. ;)
    I removed the exhaust block off plate first thing and I am not looking back.
    Todd made me a Hydromotive QIV OT 28p and I have no problems running that @ 1,87:1. I think 1,75:1 with a 25p is like running a 1,87:1 with a 27p... should be no problem.
     
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