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Loader help

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CobraJet454

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Loader Help
« on: June 19, 2022, 09:30:13 PM »
Trying to decide which loader to try next to see if I pick anything up. Boat is a 1972 18ft cobra jet 500 HP 454 with berk 12JG. Pump has old jetovator, 4 degree wedge, aluminum B impeller, SE sport loader. With Accurate GPS it will do 70 MPH. I am looking at either trying    The SS loader or maybe even the more aggressive one. Do any of you more experienced jet boater think I will have any gains or am I going in the right direction? When the fund approve I will install a stuffer and inducer and see how the boat performance if I want more I will buy a place diverted so I can run a nozzle insert and droop.
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mash on it

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Re: Loader Help
« Reply #1 on: June 20, 2022, 06:01:30 AM »
Has the current loader been tuned to your pump/boat? That's where I'd start.

Dan'l
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CJ/RR 212...under construction  "Pistol Annie"

Flusher

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Re: Loader Help
« Reply #2 on: June 20, 2022, 06:38:30 AM »
Is the pump unloading now?

You didn't mention a shoe and ride plate.  Definitely an off-season modification as ut requires pulling, machining, and resetting your intake.  I would start prioritizing that into your grand plan.

Without a shoe, you want the loader ramps hanging down below keel slightly.  You would want a more aggressive loader to compensate for a lack of shoe.  "How aggressive" is going to be a compromise between loading and MPH.  You want just enough so that you have the last amount of drag with the most suction pressure loading the impeller.

I would prioritize a Place Diverter 1st on your list.

A bowl stuffer is one of those things you do when there isn't anything left to do.  Prioritize a stuffer last.

An inducer requires pulling the shaft for machining.  That requires either pulling the pump or engine to get the shaft out.  Probably best as an off-season modification.
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"I want to roll with my brother Joe" - Joe Bateman - January 29, 1950 ~ November 27, 2013

Flusher

  • Karma: +84/-0
Re: Loader Help
« Reply #3 on: June 20, 2022, 06:41:49 AM »
Has the current loader been tuned to your pump/boat? That's where I'd start.

Dan'l
As Dan'l stated, you can try cutting the loader ramps back, little-by-little, to see if you start picking up in the direction that you want to go.
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"I want to roll with my brother Joe" - Joe Bateman - January 29, 1950 ~ November 27, 2013

CobraJet454

  • Karma: +0/-0
Re: Loader Help
« Reply #4 on: June 20, 2022, 07:32:25 AM »
Pump is not unloading or cavitation. It planes fast and pulls hard and quick. Runs flawlessly, but of course i want to see if I can go faster now. Did not know if I could pick up more from a more aggressive loader or not. I was told you can see how well your loader is working by the pressure on you water guage in the intake manifold, is that true? When I have my foot in it hard she is pushing 35psi.
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Flusher

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Re: Loader Help
« Reply #5 on: June 20, 2022, 11:13:54 AM »


I was told you can see how well your loader is working by the pressure on you water guage in the intake manifold, is that true?

Not true

Tap the suction before the impeller  1/8-27NPT for pressure gauge(s).  If one gauge, tap at 9-o-clock, directly opposite the cooling water port.  If you really want to "dial it in," tap as high and low for two gauges, roughly 11-o-clock and 7-o-clock.  You are concerned with the impeller inlet pressure, which will be a dynamic pressure, because the water is flowing.

Disclaimer:  it's really difficult to do with gauges.  Usually a data system is used to record through a pass.

I will post pictures, tonight, of where to tap.
"I want to roll with my brother Joe" - Joe Bateman - January 29, 1950 ~ November 27, 2013

CobraJet454

  • Karma: +0/-0
Re: Loader Help
« Reply #6 on: June 23, 2022, 09:52:44 PM »
Okay so I am shopping tonight more questions for you! Buying the Manuel floor mount place diverted machined for  inserts. My questions are should I buy the place diverted droop or the berkley droop? Also is the bolt on place diverted ride plate worth it?
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Flusher

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Re: Loader Help
« Reply #7 on: June 24, 2022, 12:57:53 PM »


Okay so I am shopping tonight more questions for you! Buying the Manuel floor mount place diverted machined for  inserts. My questions are should I buy the place diverted droop or the berkley droop? Also is the bolt on place diverted ride plate worth it?

For mini-droops, I like the Place Diverter HPH and American Turbine has something in between a steering adapter and a mini-droop.  I think there is merit to both designs, but without testing, it's only theory.

For full-droops, I like American Turbine and older Berkeley.  Honestly, I haven't looked at any of the new Berkeley stuff.  Between the PD full-droop and the American Turbine/Berkeley, without doing back-to-back testing, I couldn't say.  My guess is that you probably wouldn't notice a difference.  However, if you want the PD bolt-on ride plate, your choice is already determined.

Typically, with a standard intake and a <20' hull would get a full-droop.  Heavy hulls may not be able to take advantage of a full-droop without more horsepower.  There may be an advantage to not bending the water.  A full-droop lowers the thrust point, so adding one may induce some porpoising.  It's always best if you can try it first to see if you will like it.
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"I want to roll with my brother Joe" - Joe Bateman - January 29, 1950 ~ November 27, 2013

 


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