nozzle height placement
+ Reply to Thread
Results 1 to 10 of 10

Thread:
nozzle height placement

  1. #1
    Junior Member
    Join Date
    Dec 2012
    Posts
    6

    Default nozzle height placement

    hey guys, got a question about how high or low the nozzle should sit in relation to the water behind a v bottom boat at speed. i've been searching around the various forums but can't find any information or even anything in relation to this. i run a 19' cobra v hull, stock ZZ 454 motor and set back Dominator pump with AA impeller. i've got a top loader in the intake, droop snoot with standard size hole in the nozzle. the boat seems to run fine for the most part to me (76-78 mph @ 5000) but i'm just looking to fine tune it a little more if possible. with the droop snoot, it seems to run better than with the stock piece low to midrange but i can't really say any better at the top end. the more you push it, the boat seems like it wants to bury the ass end in the water with the droop snoot. the least little bit you trim it, it wants to drop off speed. a rooster tail more than 2 or 3 feet high and you can feel the boat slow down. could the nozzle be too far in the water with the droop snoot and dragging? is there some sort of rule of thumb for setting that up on a v bottom? i'm not looking to go racing but just get the thing set up right. i was also thinking about possibly one of the shorter place diverter snoots instead of the longer one i have. any thoughts?

  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #2
    Senior Member bc18's Avatar
    Join Date
    Jul 2008
    Posts
    950

    Default

    Quote Originally Posted by kaptainkrash View Post
    hey guys, got a question about how high or low the nozzle should sit in relation to the water behind a v bottom boat at speed. i've been searching around the various forums but can't find any information or even anything in relation to this. i run a 19' cobra v hull, stock ZZ 454 motor and set back Dominator pump with AA impeller. i've got a top loader in the intake, droop snoot with standard size hole in the nozzle. the boat seems to run fine for the most part to me (76-78 mph @ 5000) but i'm just looking to fine tune it a little more if possible. with the droop snoot, it seems to run better than with the stock piece low to midrange but i can't really say any better at the top end. the more you push it, the boat seems like it wants to bury the ass end in the water with the droop snoot. the least little bit you trim it, it wants to drop off speed. a rooster tail more than 2 or 3 feet high and you can feel the boat slow down. could the nozzle be too far in the water with the droop snoot and dragging? is there some sort of rule of thumb for setting that up on a v bottom? i'm not looking to go racing but just get the thing set up right. i was also thinking about possibly one of the shorter place diverter snoots instead of the longer one i have. any thoughts?
    Do you have a ride plate?

    My thrust line is .780 away from the bottom of the boat. 18' Gullwing.

  4. #3
    Junior Member
    Join Date
    Dec 2012
    Posts
    6

    Default

    i don't have a ride plate but was thinking about putting one. does a ride plate usually run parallel with the bottom of the boat or up possibly 2-3 degrees to allow the boat to trim? any specific size requirements? would you use a long straightedge along the keel of the boat to see how the thrust line falls out?

  5. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  6. #4
    Senior Member bp298's Avatar
    Join Date
    Dec 2007
    Location
    LHC
    Posts
    6,573

    Default

    Quote Originally Posted by kaptainkrash View Post
    i don't have a ride plate but was thinking about putting one. does a ride plate usually run parallel with the bottom of the boat or up possibly 2-3 degrees to allow the boat to trim? any specific size requirements? would you use a long straightedge along the keel of the boat to see how the thrust line falls out?
    do you have a place diverter or just standard berk nozzle???

  7. #5
    Junior Member
    Join Date
    Dec 2012
    Posts
    6

    Default

    i have a hydraulic trim nozzle on it. i'm also curious about the relationship of the bottom of the shoe compared to the keel of the boat. the bottom of my shoe is about a quarter of an inch above the keel on the boat as measured with a straightedge from about halfway up the boat, past the intake and out the back.

  8. #6
    Senior Member bp298's Avatar
    Join Date
    Dec 2007
    Location
    LHC
    Posts
    6,573

    Default

    Quote Originally Posted by kaptainkrash View Post
    i have a hydraulic trim nozzle on it. i'm also curious about the relationship of the bottom of the shoe compared to the keel of the boat. the bottom of my shoe is about a quarter of an inch above the keel on the boat as measured with a straightedge from about halfway up the boat, past the intake and out the back.
    you have a shoe with no rideplate? some pictures of this thing would be helpful.

  9. #7
    Senior Member bc18's Avatar
    Join Date
    Jul 2008
    Posts
    950

    Default

    Quote Originally Posted by kaptainkrash View Post
    i have a hydraulic trim nozzle on it. i'm also curious about the relationship of the bottom of the shoe compared to the keel of the boat. the bottom of my shoe is about a quarter of an inch above the keel on the boat as measured with a straightedge from about halfway up the boat, past the intake and out the back.
    Next thing I would do would be to put a ride plate on there.
    Need to get your intake machined for it. Are you sure you have a shoe?

  10. #8
    Junior Member
    Join Date
    Dec 2012
    Posts
    6

    Default

    sorry if i don't have the terminology just right. what i'm calling the shoe is the bottom of the intake at the rear of the boat where it scoops in the water. it's just a standard Dominator pump and intake assembly.

  11. #9
    Senior Member Lildave's Avatar
    Join Date
    Aug 2010
    Location
    Bauxite, AR
    Posts
    462

    Default

    A shoe would go there, but its a seperate part. Different thickness parts (shoes or spacers/shims under the shoe) can be installed to "add" shoe (hang lower than keel) or "take away" shoe (higher).

    I think mine is held on by 6 countersunk Allen head bolts.

  12. #10
    Senior Member bc18's Avatar
    Join Date
    Jul 2008
    Posts
    950

    Default

    Post a picture

+ Reply to Thread

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