Old school loader hanging low
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Old school loader hanging low

  1. #1
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    Default Old school loader hanging low

    I believe this is a stock loader from back in the day, seems like it's hanging low and possibly hurting me now that I'm above 60mph in my 21' open bow. Any thoughts?
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    Last edited by nos1967; 05-16-2016 at 06:59 PM.

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    Senior Member jetjunky's Avatar
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    is the angle at the point of transition from the keel to the intake opening as sharp as it appears in the photo? i.e. darker hull gel and cleaner white gel on the angle of the ramp. The missing paint around the grate mounting plate and beyond and apparent wear pattern on the leading edges of the grate ramps kinda suggest there's a cavitation issue there. What does the impeller wear pattern look like?

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    The transition is fairly sharp, if I ever set the pump back I'll take care of that but for now it has to remain. I'm putting more power down now and feel like it's time to start messing around with loaders.

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    Senior Member bp298's Avatar
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    that's an old "speed grate". I still have a couple of 'em laying around somewhere from 25-30 years ago. how far above 60 are you?? it's probably not hurting anything. if you were racing it, with a better loader you could possibly pick up a few tenths in et. but it won't be very noticeable on the river/lake.

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    I just did my first test run and blew the fuse in my diverter, ran 61mph with the diverter stuck slightly down. My overall goal is to hit 70mph with just me in the boat and about 2 gallons of fuel. Next steps are loader, exhaust, impeller and obviously a functioning diverter. This loader just hangs down so low it seems like it would be dragging ass.

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    Senior Member jetjunky's Avatar
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    your cavitation issues will only get worse the faster you go. how much did you say you want to spend? lol

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    can you get a decent picture of the inlet side of the impeller?

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    Quote Originally Posted by nos1967 View Post
    I just did my first test run and blew the fuse in my diverter, ran 61mph with the diverter stuck slightly down. My overall goal is to hit 70mph with just me in the boat and about 2 gallons of fuel. Next steps are loader, exhaust, impeller and obviously a functioning diverter. This loader just hangs down so low it seems like it would be dragging ass.
    the first time I ever took my sw to the track was 16 years ago to run river racer at ming. it had an old tired 454 and was nothing but a river boat with a rope deflector. we made 8 passes that weekend. the first pass was with the old speed grate that had been in it since I got the boat in '96. it had 2 buckets in it and the side tanks. first pass was 13.40/72 mph. we kept trying different things with setup. tried 3 different loaders. the best one was a v-blocker that jack calls a "river racer" loader. we picked up to 13.22/73 on the next pass with just that loader. tried another loader that someone said worked great in swtd's. boat slowed down to 69 and I couldn't get it out of there fast enough. went back with the v-blocker and kept doing other things, like small shoe depth changes, nozzle angle changes, etc. last pass of the weekend was 13.04/76mph. after that weekend, I had him make me a flat blocker loader with the exact same measurements. I still use it in the pc, most of the time.
    the thing is, at that slow of a speed, the loader isn't really making a huge contribution to performance. the boat could have gone almost that fast with just a stock rock grate. it wasn't running out of water by any stretch. the other small changes had more to do with the pickup in speed. but even with that, making a pass at 76 isn't all that much different than 73 or 74 from a "feel" standpoint.
    your biggest obstacle in gaining more speed is in overcoming drag. at 70-75, the boat is down in the water. anything that can be done to generate keel lift is going to result in an increase in speed. then, when you toss a cooler in it or another 200lb body, it'll slow back down.

    it's good to have a good loader, but you have to be careful where you get it. there are very few loader builders that I'd even consider getting a loader from. if you have one break like happened to a guy a week and a half ago at wild horse pass, it can get very ugly. they were very lucky. you should also have nozzle inserts to play with as that can make a difference.

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    Thanks for your response. I do have a nozzle insert, but I have never tried changing it out. I see what you're saying that at my current speeds the loader won't make that big of a difference. Can't really expect too much performance from small changes to a 21' open bow. I'm heading to the river next week, I'll get my baseline speed down and see if I can't borrow some loaders and nozzle inserts the next time I head out. I also have to decide if I care more about top speed or cruising at a lower rpm, I may just try taking this speed grate off and run it with nothing to see what it does.

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