What's with Jet Boat speed????
+ Reply to Thread
Results 1 to 11 of 11

Thread:
What's with Jet Boat speed????

  1. #1
    Member bparsel's Avatar
    Join Date
    May 2009
    Posts
    36

    Default What's with Jet Boat speed????

    Alright, after reading the "YJ energizer" post question it has gotten me to thinking. I'm interested in a real discussion and explanation of why there is such variation in Jet boats? With a BBF and 550hp he is only running 47mph? That seems crazy to me.

    I realize the obvious regarding HP and Pump = Speed output

    But does more of a v-hull etc really impact speed that much? The numbers on a lot of Jet boats are just all over the place

  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #2
    Senior Member
    Join Date
    May 2008
    Location
    Douglas, MA
    Posts
    1,234

    Default

    Quote Originally Posted by bparsel View Post
    Alright, after reading the "YJ energizer" post question it has gotten me to thinking. I'm interested in a real discussion and explanation of why there is such variation in Jet boats? With a BBF and 550hp he is only running 47mph? That seems crazy to me.

    I realize the obvious regarding HP and Pump = Speed output

    But does more of a v-hull etc really impact speed that much? The numbers on a lot of Jet boats are just all over the place
    I saw this guy the other day...he was on his way to the dock...




  4. #3
    Senior Member River Dad's Avatar
    Join Date
    Jan 2008
    Location
    Riverside, CA
    Posts
    1,608

    Default

    bottom design (amount of lift = less boat in the water = less drag = more speed) and overall weight of the boat. Exaust type can also play a big factor as logs will kill that HP rating and the boat will see much less power at the pump. Just my .02

  5. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  6. #4
    Senior Member River Dad's Avatar
    Join Date
    Jan 2008
    Location
    Riverside, CA
    Posts
    1,608

    Default

    Also, the bottom on an older boat could be very suspect as far as hook which will kill speed real quick. After lookin at the other post, that does seem pretty far off from where you would think it should run...

  7. #5
    ptz
    ptz is offline
    Senior Member
    Join Date
    Jun 2008
    Location
    so ca
    Posts
    785

    Unhappy

    too much cam....
    loud is not fast.

    pumps are out dated concrete pumps..

    to large dia of impeller....wrong pitch....to large intake....to small nozzle...wrong taper angles...etc.
    basically a pos design.
    monkey love

    "why is my stuff shit... and your shit stuff ?"

    "If ever a time should come, when vain and aspiring men shall possess the highest seats in Government, our country will stand in need of its experienced patriots to prevent its ruin." Samuel Adams

  8. #6
    Member bparsel's Avatar
    Join Date
    May 2009
    Posts
    36

    Default

    Quote Originally Posted by terrible_buddhist View Post
    I saw this guy the other day...he was on his way to the dock...




    HAHAHAHA!!! That is awesome!

    The main reason I ask is my boat is a deeper V, running about 525 horse, with all new pump components (stainless), a speed loader, a torker cam, a 1"lift adapter plate, a new Q-Jet and some other engine mods, and no logs and I pulled 68 on GPS sunday night.

  9. #7
    About 500' AGL MudPumper's Avatar
    Join Date
    Jan 2008
    Location
    Santa Clarita
    Posts
    2,470

    Default

    My V-Bottom with 648 HP ran 92mph on GPS. It's all in the Setup..pump, bottom etc.

  10. #8
    What the Hell is That? 72Hondo's Avatar
    Join Date
    Apr 2008
    Location
    Denton, TX
    Posts
    1,633

    Default

    Quote Originally Posted by MudPumper View Post
    My V-Bottom with 648 HP ran 92mph on GPS. It's all in the Setup..pump, bottom etc.

    Show off!
    Quote Originally Posted by Kyle View Post
    Log off and go float, hang in the party coves, Show and shine on the trailer, fill up the boat, wax it, v-drive, jet, outdrive, and if you got a canoe and your reading this, you sir, need to phucking upgrade.

  11. #9
    Member
    Join Date
    May 2009
    Posts
    84

    Default

    Quote Originally Posted by ptz View Post
    pumps are out dated concrete pumps...
    Schwing, Putzmiester, or Thompson?

  12. #10
    Cas
    Cas is offline
    Angry American Cas's Avatar
    Join Date
    Jan 2008
    Location
    NorCal
    Posts
    3,103

    Default

    Quote Originally Posted by bparsel View Post
    Alright, after reading the "YJ energizer" post question it has gotten me to thinking. I'm interested in a real discussion and explanation of why there is such variation in Jet boats? With a BBF and 550hp he is only running 47mph? That seems crazy to me.

    I realize the obvious regarding HP and Pump = Speed output

    But does more of a v-hull etc really impact speed that much? The numbers on a lot of Jet boats are just all over the place
    It might be 550 hp but where is it making it's power and what do the hp and tq curves look like?
    He could have 550 peak hp at 7000 rpm with only 250hp at 4000 which isn't any good for an all around use lake jet boat. If that 550 is at 5000 with 400 at 4000, it'll go pretty darn good providing the impeller is matched.
    There have been many people over the years that built an engine with the power curves in the wrong place that have been very unhappy.
    550 running 47, yea, something isn't right. What kind of rpms?

  13. #11
    Cas
    Cas is offline
    Angry American Cas's Avatar
    Join Date
    Jan 2008
    Location
    NorCal
    Posts
    3,103

    Default

    Quote Originally Posted by ptz View Post
    pumps are out dated concrete pumps..
    concrete pumps? how about irrigation ditch pumps.

+ 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