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Discussion Starter #1
Hey Guys,

Ok, so I have a 21' 1978 Omega Open Bow Jet Boat with a Jacuzzi WJ (doesn't look like it has had any work done to it, but I'm gonna open it up to verify) and I just got a Twin Turbo BBC that I was thinking of putting in there in until I have a faster hull that I want to drop the motor into. I am planning to strengthen the stringers with fiberglass cloth, a rail kit, and a pump brace. The question is if I have all my bases covered to put this engine in this boat. If necessary (Primarily to avoid any failure, secondarily to gain efficiency/MPH) I would like to either have the Jet worked or install an energizer kit in the future. Does anyone have personal experience with both? Will it handle that HP as it is if I don't plan on beating on it until the Jet has undergone some work? It ran pretty good (no GPS MPH taken) with a 400-450HP BBC previously.

I would like to hear some advice on what my best option is, and what is absolitely necessary to avoid any catastrophic failure. The goal is to have a pretty quick cruiser, as I am obviously not going to be racing with this boat. I just want to have a good cruiser and I'm sure I'll take the TT BBC engine out in favor of a small quick boat in the future. I don't want to dump a bunch of money into the Jet if it will hold up as is. I appreciate any input or advice. I will post pics soon of the boat and jet.

Thanks,

Oscar
 

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Anyone who tells you to ditch the WJ doesn't know what they are talking about. Its a good pump and has potential. For the money, id save my coin and have the stock parts prepped by MPD. The reason I say this is that while the energizer kit is an upgrade, all the parts are still stock and arguably in need of a blueprinting, while the shortcomings of the WJ can be overcome with the blueprinting alone and produce a major increase in performance.

Being one of the few on the boards who have owned a tricked out WJ, Id say run it. If you are planning on selling it soon, then I might save the money and just make sure the pump is tight. Tough to recoup your investment in a WJ due to all the misinformation out there. If it doesn't have a shoe/rideplate, and you decide to keep it a while, its a worthwhile upgrade for a cruiser.

Depending on the hull, and where that motor makes power with a detailed pump you should see somerwhere in the 80's for mph. With a stock WJ, id say you will leave 12-15 mph on the table. Big limiting factor for the WJ is the bowl exit volume. Get that opened up, detail the impelled and you should be moving pretty well for a big jet.
 

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Discussion Starter #5
WJ Pump HP Capability

Can anyone tell me what HP a stock WJ Pump can handle, what a worked pump is good for, and what an Energized WJ is good for?
 

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Can anyone tell me what HP a stock WJ Pump can handle, what a worked pump is good for, and what an Energized WJ is good for?
As far as I know they will take whatever you put to them, the impeller however should be changed to match the HP/desired RPM.

I am running an energized WJ with an "A" aluminum impeller and turning it about 54-5500 RPM. Motor is putting out about 450-500 according to the AT chart. Last time out I ran 69mph on the gps. 18ft Witchcraft. I am very satisfied with the Jacuzzi pump.
 

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Stock pump will handle what you throw at it. I put 800 to minewith all stock parts(blueprinted by MPD) and turned it 5800 rpm. GPS was 103. It did have a loader in it but everything else was Jacuzzi parts. Impeller was aluminum. I did locate and purchase a stainless jacuzzi impelled but never ran it.

The energized kit replaces the bowl and impeller. As indicated previously, the stock bowl has flow limitations in stock form which IMO is the reason the kit was developed.
 
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