First jet boat haven't even had her in the water yet just trying to learn what I have. My pump says 12jb-a on it  but I was told it looks like a jc and that a jb is a split bowl. From what I gathered A is my impeller any clue what kinda rpm id see out of a mild 455 in a rogers cyclone with this impeller?  And how much bennefit would I see out of a place diveter?  My unrealalistic goal would be a high 60 mph boat that came out of the hole really hard.

Whts a good source for a rebuild kit for the pump?

Technicaly Aguanga and right now henderson nevada. And some times on the water in Palo verde ca.

I have a c bowl. I would say save your money on the diverter. I spent the money and found real quick that the rooster is only 5-8 feet off the surface. The nozzle is directed down from the get go and the diverter for our bowls doesn't give us much. There are some tech articles on people grinding out the arm and the top of the diverter where it seals with the nozzle. I did this and saw little to no gains. Save your money and run it how it is.

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So much of me wants to disagree with you.... And I'll tell you why.
Every hull is different, even the same hull out of the same mold can be different to some degree.
Most boats in those days were being popped out like zits on a fat girls ass.
So they have a tendency to vary and the rogers hulls , 9 times out 10 like a droop which changes the pin angle that the C bowl is at...
Which is why that boat originally came with a JB.
My suggestion would be to get your hands on a diverter (after a pump rebuild of course) and then put it through the paces.
If it responds well, look for a split bowl , droop , and diverter.
Not to mention you are gonna want to get the deep bow entry up and out of the water, and that fact alone has been proven .

Another thing, people were grinding away at the diverters to get more roost, which will NEVER get you more mph.
Depending on set up, the roost should be 3 to 6 ft above the water is where most boats run the best.
These old Rogers hulls are no mystery.
I'm sure Brad could tell exactly where that boat like to run.

Anyways, good luck, and cool boat.

-beerjet-

Sounds like I should do the same. I hate mine.

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I've got a JC with diverter and I don't get a huge roost, but that wasn't my intent of adding The diverter. The ride difference is amazing!

Like beerjet said, all will be different. Plus it's river time, get on the water and ponder during the winter lol


Sent with my Fingers

Is it just me or is that a JC bowl with JE nozzle...?



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That is an early C bowl nozzle.

-beerjet-

So do i have a b/c hybrid pump? Is there a reason behind this or is my pump a cobbled together pos?

The stamps stay on the suction housing.
At some point, it had a B bowl ) split bowl) and being more desirable, someone probably swapped it out for the C bowl on there now.

-beerjet-

So is a c bowl better than a b/g split bowl if so why?

The late Berkeley G bowl has the advantage of a flange that allows you to bolt on the droop of your choice; however you can still add a Place Diverter to your C bowl.  Another advantage of the later G bowls over early Berkeley split bowls is that there is less volume around the impeller in the late G bowls and therefore the pump will build pressure faster.

I have heard that the Berkeley C bowls actually flow better than the Berkeley split bowls.  I do believe that it is not so much flow as it is water control.  The vanes in the C bowl are longer than those in the split bowls.  My theory is that, the vanes are carried further back in the bowl, helping to straighten the water after being spun by the impeller.  I also believe that there is very little volume between the vanes and the nozzle for turbulence, therefore laminar flow is maintained until discharged through the nozzle, developing more thrust.

I wouldn’t waste any money on acquiring an early split bowl.  You would see a noticeable gain if you have your C bowl detailed, but I think I would spend money on detailing your impeller and adding an inducer before bowl work.  If you really are set on upgrading to a split bowl or when you are ready, I highly recommend making the switch to a Dominator bowl.  Our testing indicates that an unmodified Dominator bowl is equivalent to a fully-detailed Berkeley G bowl.

This all assumes that your current bowl is in good condition.  If there is any damage to the vanes, especially on the leading edges, performance goes south quick.

FWIW, I think a Place Diverter is a wise investment regardless.  I also consider a loader to be a must-have item.

Cheers,

Joe