Cavitation
+ Reply to Thread
Page 1 of 2 1 2 LastLast
Results 1 to 14 of 22

Thread:
Cavitation

  1. #1
    Renegade jet tunneljet's Avatar
    Join Date
    Apr 2008
    Location
    Shorewood Il
    Posts
    472

    Default Cavitation

    I have a 21'6" renegade open bow(similar to an ultra). It is a big heavy family style boat. Even after having a fresh wear ring installed and the leading edge of the impeller detailed I am still experiencing a lot of cavitation. I have a legend pump with an A impeller and a place diverter. The pump is set back with the hand hole completely outside the boat. I have read that not having a ride plate on a setback pump may cause this. Any suggestions?

  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #2
    Senior Member
    Join Date
    Feb 2015
    Location
    619
    Posts
    595

    Default

    Add an inducer it will load the pump harder and eliminate cavitation,my thoughts.
    Slinging Lead on and off the water for over 40 YRS

    82 18' Crusader Tunnel SOLD ,
    00 23' Mako 232 fish killer,SOLD
    78 19' Eliminator Daytona SOLD
    16 19' Predator/Cheyenne

  4. #3
    Renegade jet tunneljet's Avatar
    Join Date
    Apr 2008
    Location
    Shorewood Il
    Posts
    472

    Default

    I had thought about that also, but I feel like the pump is sucking air all the time. From idle through about 4000rpm it just never feels like it is fully hooked up.

  5. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  6. #4
    Senior Member Mohavekid's Avatar
    Join Date
    Jan 2008
    Location
    Penn Valley, The Sierra Foothills
    Posts
    148

    Default

    It shouldn't be pulling air thru the intake once you have some good forward momentum.

    It could be pulling air thru the shaft packing.

    Sent from my XT1096 using Tapatalk

  7. #5
    Senior Member Mohavekid's Avatar
    Join Date
    Jan 2008
    Location
    Penn Valley, The Sierra Foothills
    Posts
    148

    Default

    Have you checked the wear ring? It could just be a won pump.

    Sent from my XT1096 using Tapatalk

  8. #6
    Renegade jet tunneljet's Avatar
    Join Date
    Apr 2008
    Location
    Shorewood Il
    Posts
    472

    Default

    I will double check the packing before I take it out next time, but I just recently tightened it and it made no difference. The wear ring is brand new and the leading edge of the impeller was recently detailed.

  9. #7
    Member Jordandangerfield's Avatar
    Join Date
    Oct 2012
    Location
    Temecula. CA
    Posts
    97

    Default

    Was it doing the same thing before the rebuild? Do you have any pics of the setup?


    Sent from my iPhone using Tapatalk

  10. #8
    Renegade jet tunneljet's Avatar
    Join Date
    Apr 2008
    Location
    Shorewood Il
    Posts
    472

    Default

    It was the same before the rebuild, that is why I figured it need the rebuild.

  11. #9
    Renegade jet tunneljet's Avatar
    Join Date
    Apr 2008
    Location
    Shorewood Il
    Posts
    472

    Default

    Here is a pic of the intake in relation to the transom.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	IMG_3322_1500686214761.jpg 
Views:	77 
Size:	6.8 KB 
ID:	981145  

  12. #10
    Senior Member
    Join Date
    Mar 2009
    Posts
    3,342

    Default

    First, when did this problem appear? Were there any changes to the boat before vs after?

    I couldn't figure out the pic you posted- But I am half blind.....Anyway, You definitely need a ride plate behind the pump....The pump can pull air in even after you're on plane. Also, you should check your packing, and also your clean-out hole cover seal- There should be an O-ring there.

    I have a CVX-20 jet (2200 lbs) with 400 hp and a legend impeller in a Berk JE pump....I never have cavitation- except whenever I suck a chunk of driftwood into the pump and it wedges on one of the impeller blades.

  13. #11
    Senior Member
    Join Date
    Feb 2015
    Location
    619
    Posts
    595

    Default

    check for a gap at the seams where the intake and the suction connect fill with silicone check or fishing line also in the bowl vein could have debris in one of them (rock or piece of wood) ,,,all check out good install an Inducer problem solved . also bad wires or bad plugs could make you think you have a cavitation feel.
    Slinging Lead on and off the water for over 40 YRS

    82 18' Crusader Tunnel SOLD ,
    00 23' Mako 232 fish killer,SOLD
    78 19' Eliminator Daytona SOLD
    16 19' Predator/Cheyenne

  14. #12
    Renegade jet tunneljet's Avatar
    Join Date
    Apr 2008
    Location
    Shorewood Il
    Posts
    472

    Default

    This has been an issue since I bought the boat. I bought it over the winter so I only heard it run on the trailer. I haven't checked the handhole cover, but I will definitely do that. I think the bowl is clear since I had the pump gone through by a pro. Also the performance of the engine seems perfect it still tops out in the mid to upper 50's.

  15. #13
    Renegade jet tunneljet's Avatar
    Join Date
    Apr 2008
    Location
    Shorewood Il
    Posts
    472

    Default

    Just checked and was hoping it was just a handhole O-ring, but it was there and in good shape seated properly.

  16. #14
    Senior Member ol guy's Avatar
    Join Date
    Mar 2008
    Location
    Lake Elsinore Ca
    Posts
    3,811

    Default

    wrong loader for that boat?

+ Reply to Thread
Page 1 of 2 1 2 LastLast

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Please select your insurance company (Optional)

Log-in


Tags for this Thread

Digg This Thread

Posting Permissions

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

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95