460 spins 5100 rpm
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460 spins 5100 rpm

  1. #1
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    Unhappy 460 spins 5100 rpm

    took the boat for a spin first time since i bought it it has a 460 milled heads port and polish weiland intake and i belive a 600cfm edelbrock thing is i dont know much about jetboats im trying to learn i feel it pulls real good from 4000 to 5100 rpm top gps speed was 45 mph it has a berkely pump i might ad that this a rochelle craft 1500lbs boat do i need more carb or is this all shes got also she brank 25 gallons in 3 hours...is that normal?????????

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    tintingsandiego krusn56's Avatar
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    Do you know what impeller it has. Could use a tune and or pump work. Jets dont get the best mpg. Your tach could be off a bit as well. What size boat and toss up some pics....
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    Platinum Member BigSteve's Avatar
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    Quote Originally Posted by ATTITUDE ADJUSTER View Post
    took the boat for a spin first time since i bought it it has a 460 milled heads port and polish weiland intake and i belive a 600cfm edelbrock thing is i dont know much about jetboats im trying to learn i feel it pulls real good from 4000 to 5100 rpm top gps speed was 45 mph it has a berkely pump i might ad that this a rochelle craft 1500lbs boat do i need more carb or is this all shes got also she brank 25 gallons in 3 hours...is that normal?????????
    Look on your carb for a list # on a Holley, what type of exhaust

    Try and come up with real #s ie GPS, use a hand held tach check and see if the #s match

    Run a stright edge on your hull and check for a hook

    Bottom line is a motor and pump have to work as a team and is limited by the hull design

    What type of boating do you do and what our your goals and budget

    Sounds like you have a family jet boat turn the key and go with limited performance

    package. A few dollars spent on the trailer, a electrical tune and fresh oil a little polish

    good to go
    Last edited by BigSteve; 04-03-2011 at 07:49 PM.
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    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by ATTITUDE ADJUSTER View Post
    took the boat for a spin first time since i bought it it has a 460 milled heads port and polish weiland intake and i belive a 600cfm edelbrock thing is i dont know much about jetboats im trying to learn i feel it pulls real good from 4000 to 5100 rpm top gps speed was 45 mph it has a berkely pump i might ad that this a rochelle craft 1500lbs boat do i need more carb or is this all shes got also she brank 25 gallons in 3 hours...is that normal?????????
    More info would be helpful but assuming this Rochelle is a 19 to 20 with 400 hp + or- , 5100 and had a good working jet pump ,should bring you more like 55 to 60 (normally loaded) got a hunch its time to freshen the jet . Hard to put a theory on the fuel use , depends on how you were driving , jets and fuel economy do not go "hand in hand" . A 600 eddy would not be my weapon of choice, personally (750 or better Holley) Tom

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    Senior Member Cowboy_Mike's Avatar
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    Default Small carb??

    Hi, It might be that you are running a small carb. 600cfm doesn't sound like much for a big block. I have a healthy small block, and I am running the 750 Edelbrock. Maybe you can look under the boat, and through the intake grate with a flash light, or try looking through the hand hole on thie top of the pump. See what the impeller looks like. It could just be a simple tuning issue. All kinds of variables without more info. Edelbrocks have a stamped number on the front bottom surface of the carb mounting pad. Look at the different carb lists to find yours!!


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  8. #6
    Senior Member jetboatperformance's Avatar
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    Attitude A any more info on your setup?

  9. #7
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    Quote Originally Posted by jetboatperformance View Post
    More info would be helpful but assuming this Rochelle is a 19 to 20 with 400 hp + or- , 5100 and had a good working jet pump ,should bring you more like 55 to 60 (normally loaded) got a hunch its time to freshen the jet . Hard to put a theory on the fuel use , depends on how you were driving , jets and fuel economy do not go "hand in hand" . A 600 eddy would not be my weapon of choice, personally (750 or better Holley) Tom
    X2

    I'm with Tom on this one. I would first be more concerned about the RPM vs MPH. I think you need to check out the pump. I once had a Rochelle and think it was a great lake boat. However, it is a fairly heavy hull and will never be a race boat per say. A great lake boat and can achieve speeds of 55 to 60 with a stock 460 and 600 cfm carb. I ran an "A" impeller and a "AA" in the boat and ran over 50 all the time at much less than 5000 RPM and better fuel economy to boot.

  10. #8
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    As Tom said a 750 DP Holley at a min would be better. Ford 460's like more carb than a 600. Need to freshen up the pump.

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    I never got more than 3 hours out of 25 gallons with my 460, 0.40 over and a 750. 2.50 hours on a fun day!

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    HERES SOME PICS OF MY BOAT IT SEEMS LIKE IT SHOULD GO AT LEAST 55 60 MPH I KNOW ITS HEAVY AND YES A GREAT FAMILY BOAT..ALSO WHAT IS THIS ABOUT A HOOK ON THE HULL.THANKS FOR THE IMPUT..
    Last edited by ATTITUDE ADJUSTER; 04-05-2011 at 05:35 PM.

  13. #11
    Boat Nut sleekcrafter's Avatar
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    A good pump, and an A impeller should be netting nearly 70 mph, at 5100 rpm.
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    Quote Originally Posted by One More Year View Post
    I never got more than 3 hours out of 25 gallons with my 460, 0.40 over and a 750. 2.50 hours on a fun day!
    YEAH THAT WAS PROBLY A WHILe back now its $90 for both tanks ....ouch....

  15. #13
    Member Katanna's Avatar
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    The problem is obvious after looking at your photos. Untie the tube!

  16. #14
    Senior Member 79sleek's Avatar
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    My buddies got a boat like yours with a fresh berkeley jet and mild 454 and he's getting 55 mph with full load of people and 60 with only him in it and that's at higher altitude trhan denver co check out the jet. My 460 will go a full day on 25 gal of fuel big cam stealth intake 750 demon marine carb roller rockers maybe bigger carb would help too

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