little loader advice??
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little loader advice??

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    Member jetboat ratt's Avatar
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    Default little loader advice??

    I was wondering if you guys could give me some advice wether I need a loader or not. I have a '79 General Marine Ranger(same hull pretty much as a Challenger) with a "B" impeller and around 600hp. Iam trying to figure out where Iam losing my RPMs. Last weekend when I had 3 other people in my boat my RPMs went to 6000 to 6100 but when I made a couple of passes by myself I could only pull 5800. Is that due to weight in the rear allowing the pump to get more water or because I dont have a loader? Iam a little confused and open to any knowledge about how jets work. Thanks

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    Senior Member Boat 405's Avatar
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    Quote Originally Posted by jetboat ratt View Post
    I was wondering if you guys could give me some advice wether I need a loader or not. I have a '79 General Marine Ranger(same hull pretty much as a Challenger) with a "B" impeller and around 600hp. Iam trying to figure out where Iam losing my RPMs. Last weekend when I had 3 other people in my boat my RPMs went to 6000 to 6100 but when I made a couple of passes by myself I could only pull 5800. Is that due to weight in the rear allowing the pump to get more water or because I dont have a loader? Iam a little confused and open to any knowledge about how jets work. Thanks
    A jet boat will turn the same rpm tied to a dock or at full speed, unless it starts to cavitate, then it will turn more rpm

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    Senior Member Brendellajet's Avatar
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    Quote Originally Posted by jetboat ratt View Post
    I was wondering if you guys could give me some advice wether I need a loader or not. I have a '79 General Marine Ranger(same hull pretty much as a Challenger) with a "B" impeller and around 600hp. Iam trying to figure out where Iam losing my RPMs. Last weekend when I had 3 other people in my boat my RPMs went to 6000 to 6100 but when I made a couple of passes by myself I could only pull 5800. Is that due to weight in the rear allowing the pump to get more water or because I dont have a loader? Iam a little confused and open to any knowledge about how jets work. Thanks
    Perhaps some grass or debris stuck in the pump causing it to cavitate to 6000-6100?

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    Amber Racing Services BUSBY's Avatar
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    perhaps a clogged fuel filter or cheap gas?

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    Senior Member W.O.T's Avatar
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    your motor could just not be running as good. i know i have tuning issues somedays. or your tach could be off. what impeller are you running spinning those rpms? i have a challenger with about 600 hp running a berkely extreme loader. im running around those rpms with a b impeller. could be anything motor/fuel/ignition/pump/tach/sender.

    Also where were you spinning 6100 rpms at full speed, or take off? if it was at take off you could have been cavitating. does the motor run and sound the same but just different rpm numbers?

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    TEN THIRTY ONE RCB19's Avatar
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    Quote Originally Posted by BUSBY View Post
    perhaps a clogged fuel filter or cheap gas?
    You're worse than Redding Video Buzzard.
    RCB

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    Member jetboat ratt's Avatar
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    Quote Originally Posted by W.O.T View Post
    your motor could just not be running as good. i know i have tuning issues somedays. or your tach could be off. what impeller are you running spinning those rpms? i have a challenger with about 600 hp running a berkely extreme loader. im running around those rpms with a b impeller. could be anything motor/fuel/ignition/pump/tach/sender.

    Also where were you spinning 6100 rpms at full speed, or take off? if it was at take off you could have been cavitating. does the motor run and sound the same but just different rpm numbers?
    Yeah Iam running a B impeller too. If you are running around the same RPMs than maybe its right. I was talking about top speed RPMs. Maybe I was cavitating when I hit that 6000. When is it useful to get a loader? Does it work well on your boat? Also if we are running about the same setup have you GPS'd your boat?

    Thanks guys for the input. Feel free to inform me some more, Iam trying to learn about these damn jets.

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    Senior Member jetboatperformance's Avatar
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    Your RPMs vs HP vs "B" sounds about right, 600 hp & that boat etc ,should have a high quality ,properly tuned and (properly mounted) loader IMO Tom
    Last edited by jetboatperformance; 05-10-2008 at 10:11 AM.

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    Senior Member W.O.T's Avatar
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    my boat did cavitate at times before i added the loader. i noticed it alot when the water was slightly choppy and not so much now with the loader. i really would like to add a shoe and ride plate. i have gps'd it before with just me in the boat and not much gas at 82 mph. heres a pic of what im workin with.

    my pump needs a rebuild and i have noticed my rpms a little higher than when the pump was fresh.


  12. #10
    Member jetboat ratt's Avatar
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    Quote Originally Posted by W.O.T View Post
    my boat did cavitate at times before i added the loader. i noticed it alot when the water was slightly choppy and not so much now with the loader. i really would like to add a shoe and ride plate. i have gps'd it before with just me in the boat and not much gas at 82 mph. heres a pic of what im workin with.

    my pump needs a rebuild and i have noticed my rpms a little higher than when the pump was fresh.

    Damn 82. Thats nice. I would be pretty happy with that. My pump is fresh, I just did the pump when I built the motor. I just thought maybe the loader does give you more MPH because you are taking on more water which in turn pushes more water.

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    Senior Member W.O.T's Avatar
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    the pump on my boat was rebuilt by mpd just before i bought the boat. then i had Joe at JP Marine detail the impeller. I also purchased the loader from JP. I would definitely try one. they say if your running over 60mph you need a loader over a stock grate. im having some setup issues that i need to work with, porpoising mostly.

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    Member jetboat ratt's Avatar
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    Quote Originally Posted by W.O.T View Post
    the pump on my boat was rebuilt by mpd just before i bought the boat. then i had Joe at JP Marine detail the impeller. I also purchased the loader from JP. I would definitely try one. they say if your running over 60mph you need a loader over a stock grate. im having some setup issues that i need to work with, porpoising mostly.
    If you ever hang out in needles let me know i would like to check out your boat. Iam usually there about every 3 weeks or so. Also maybe talk to you a little more about your set up and what I should do.

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    What grate are you running now? 600 is too much for a rock grate. You may also find that a loader will slow the the motor a little, but your speed will increase due to feeding the pump.

  16. #14
    Senior Member W.O.T's Avatar
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    Quote Originally Posted by jetboat ratt View Post
    If you ever hang out in needles let me know i would like to check out your boat. Iam usually there about every 3 weeks or so. Also maybe talk to you a little more about your set up and what I should do.
    sure that would be great. never been to needles dont even know exactly where it is. i usually go to the lower colorado martinez lake. i think i will be out there end of this month with some friends. i would like to try other places on the river though.

    I really wanted to rebuild the pump and put the american turbine impeller in from Jet Boat Performance but i just had to move and money is tight!

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