Page 1 of 2 1 2 LastLast
Results 1 to 10 of 11
  1. #1
    r33pwrd's Avatar
    Join Date
    Mar 2006
    Location
    Sammamish Washington
    Posts
    4,216
    +1
    360

    Question on prop?

    So looking at my prop i have a pretty big gap from the back of the prop to the vein section (when you screw the prop on it almost looks like it doesnt go on far enought) Is it worth my time to machine the back of the prop hub to close up that gap between the hub and vein section?


  2. #2
    jgustman's Avatar
    Join Date
    Apr 2006
    Location
    Cottonwood, Mn
    Posts
    133
    +1
    5
    Leave it alone, mine looks that way, I think a .080" gap(Don't quote me on that". I asked Kerry about this too and he said it should be that way. Starts burning up stators if you move it closer in his testing.

  3. #3
    r33pwrd's Avatar
    Join Date
    Mar 2006
    Location
    Sammamish Washington
    Posts
    4,216
    +1
    360
    So than what is "setting back your prop"? thanks

  4. #4
    MR. SCOVILLE UNIT SUCKMYWAKE's Avatar
    Join Date
    Aug 2005
    Location
    ASTON, PENNSYLVANIA
    Posts
    2,836
    +1
    8
    machining the hub to move impeller closer to the vein section is indeed called a set back impeller

  5. #5
    r33pwrd's Avatar
    Join Date
    Mar 2006
    Location
    Sammamish Washington
    Posts
    4,216
    +1
    360
    so having a "setback impeller" will damage the stators/vein section?

  6. #6
    MR. SCOVILLE UNIT SUCKMYWAKE's Avatar
    Join Date
    Aug 2005
    Location
    ASTON, PENNSYLVANIA
    Posts
    2,836
    +1
    8
    not at all

  7. #7
    Duke's Avatar
    Join Date
    Jul 2006
    Location
    Florida
    Posts
    10,004
    +1
    406
    Most people I have talked to say setting the impeller back helps prevent cavitation and burning the stator.
    Mine has been set back for 30+ hrs of
    riding and the stator looks like new.
    Pulled the pump a couple a days ago
    to try another prop.

  8. #8
    r33pwrd's Avatar
    Join Date
    Mar 2006
    Location
    Sammamish Washington
    Posts
    4,216
    +1
    360
    So for those who have done the "setback" did you see and improvement in acceleration or top speed? If the vein section becomes "damaged" can it be repaired or do you have to replace it?

  9. #9
    GPRPITMAN's Avatar
    Join Date
    Feb 2006
    Location
    capecoral fla
    Posts
    880
    I have tested both setback and not Setback seemed to be a little better at of the hole but not enough to justify the burning up of the veins on the 05 pump. The older pumps I didn't see this I have run the same top end speed numbers with prop real close to the veins and as far back as a 4mill gap. Now some boats with out some motor work you can get away with the setback for a little better hole shot

  10. #10
    Duke's Avatar
    Join Date
    Jul 2006
    Location
    Florida
    Posts
    10,004
    +1
    406
    Quote Originally Posted by Rocketman View Post
    it depends but is sure more likley to with setback I doint run setback for that
    reason but others may get away with it. Could possibly have something to do with the water you run in or how locked down you are vs horsepower and speed. I suspect the latter.

    Kerry, didn't mean to sound like I was replying to your post. It popped up while I was typing. I was looking at his signature and figured he was close to the same power as me. Also have 05 pump as well. Surely when you start making big power with tripples and big blocks things change dramatically.
    I've seen race motors take stainless Skat pumps and bend all the veins staight!!!

Page 1 of 2 1 2 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Prop question on 2006 Speedster 200 430
    By FastMatt in forum Sea Doo Sport Boats
    Replies: 5
    Last Post: 04-27-2011, 10:29 AM
  2. 08 T-X Question on grate and prop
    By williet in forum 4-Tec Performance
    Replies: 10
    Last Post: 05-21-2010, 06:21 PM
  3. Question on High Altitude Props RXTX - 2800 to 3800 Feet
    By Bigcat1 in forum 4-Tec Performance
    Replies: 5
    Last Post: 08-16-2009, 05:23 PM
  4. Question on prop 14/19r, or 15/20, with my mods, rpms??
    By doc212121 in forum 4-Tec Performance
    Replies: 10
    Last Post: 10-15-2007, 11:46 AM
  5. prop and sc questions on 06 RXP
    By mjet in forum 4-Tec Performance
    Replies: 1
    Last Post: 04-03-2007, 07:19 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •