Installing a Bowl Stuffer into a Berkeley 12JG Jet Boat Pump
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- Опубликовано: 14 окт 2024
- While I had my Berkeley 12JG Jet pump out of my boat, I decided to install a CP performance billet bowl stuffer.
The purpose of the stuffer is to eliminate the void or space that is left from the back side of the impeller to the bowl of the pump. This will prevent water from getting in this area and creating turbulence, effecting the water flow from the impeller blades to the bowl vanes. It will clean up the water flow, improve the overall efficiency of the pump and help prevent cavitation.
Overall the bowl stuffer installation is relatively simple, but there are some things that you need to keep in mind. The biggest of these are your internal clearances. The main thing is to be sure that you have enough room being the back side of the impeller to the down for the stuffer. Now on the CP stuffer that I have, I had to accommodate for an additional .116" in thickness from the stuffer. CP calls out to have the pump shaft machined .040-.090" in order to accommodate the stuffer. This will move the impeller forward in the suction housing to make that room. Now in doing this you need to be sure that you do not move the impeller so far forward that it makes contact with the wear ring, or suction housing.
Now if you do not have room to move the impeller forward you will have to remove material from the seat that the stuffer sits on within the bow to create the needed clearance.
With a OEM un modified pump there should be amble clearance. But double check to be sure that your pump has not been modified or "tightened" up since that will complicate the installation.
Also mark and drill your holes for the stuffer one at a time. Learn from me and do not drill all four at once. When I did this I found that my stuffer was rotated a few degrees and no longer centered within the bowl. Im sure I could have left it like that and ran it, but I was able to quickly weld up the holes with my TIG welder. I then bolted the stuffer in with one bolt, then marking and drilling each following hole one at a time. By doing it this way I was able to keep the stuffer centered in the bowl.
CP Performance Billet Bowl Stuffer: www.cpperforma...
CP Performance Inducer: www.cpperforma...
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Thank you for showing your mistakes and how to fix them, helps younger guys like me and I don’t feel so stupid when I make the same mistakes
Nice vid. For me I think the bowl stuffer mod would be quite far down the list of pump mods. I'd really like to see some data or back to back tests on what difference it makes to holeshot etc but there seems to be nothing out there on this. Also with drilling into the oil chamber you now have swarf in the chamber which could get into the shaft bearings and seals. I guess its really for the guys wanting that last bit of performance from the pump.
I am in complete agreeance with you. Adding a stuffer to a pump is a mod that should be at the very bottom of anyone's list of mods to do.
~ NIck
Looking forward to the next video on this! Huge help and great detail. Beats the 14 second video the company puts out
Thank you! It’s good to hear that the video was a help!!
I was cringing as you were marking those holes having made the same mistake. You cannot even do that with woodworking let alone something that needs to be done extremely accurately. Next lesson you’re about to learn is all that crap that you’re blowing into the center of your bowl is going into that bearing. Don’t be surprised when it wears out early.
No need to worry about the bowl bearings/bushings. I took my time to clean out all the aluminum bits within the cavity...
~ Nick