Berkeley Pump - need help

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71BeaterBoat

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« on: February 27, 2018, 03:50:56 PM »
Alright guys, I need some help here. 

454BBC (passenger/2 bolt/ ~325HP). 
Berkeley JC pump. 

WOT - 4900 RPM & 46 MPH - Sea level with 4 adults
WOT - 5100 RPM & 50.6MPH - 3700' elevation - 1 adult.

Pulling a skier, the pump cavitates and doesn't produce much torque. 

Based on the above the assumption has been that the impeller was a C cut, which was causing the high RPMs and cavitation from a stop under load.  I was getting ready to send the pump out to get rebuilt with a new impeller so I pulled it apart and this is what I found inside.  A2 cut impeller, what looks to me like clean leading edges, no obvious issues.  So what gives?  Why are my RPMs so high and having trouble with the holeshot?   

Now I have no clue what to do with the pump rebuild.  I'm glad I might save some money on not needing a new impeller, but at a loss for performance issues. 


jim brock

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« Reply #1 on: February 27, 2018, 05:44:12 PM »
what kind and size boat, impeller looks to be cut down to at least a :A: the front leading edge on the wear ring surface is to far back from the suction, was the suction damaged there, can't really make it out, needs to be taken apart and checked out, pump slipping coming out of the hole usually means a worn out wear ring.  Jim

71BeaterBoat

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« Reply #2 on: February 27, 2018, 06:17:22 PM »
what kind and size boat, impeller looks to be cut down to at least a :A: the front leading edge on the wear ring surface is to far back from the suction, was the suction damaged there, can't really make it out, needs to be taken apart and checked out, pump slipping coming out of the hole usually means a worn out wear ring.  Jim

1971 Tahiti 19 v Hull. 


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96Laveycraft21Xt

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« Reply #3 on: March 06, 2018, 07:19:31 AM »

1971 Tahiti 19 v Hull. 


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Just for reference, our 69 tahiti with 425 horse turns 5100 rpm at 69 MPH on GPS.  I would think maybe your Tach is off.



this isnt a white boat with blue/pink/purple stripes is it????????

71BeaterBoat

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« Reply #4 on: March 06, 2018, 11:56:19 AM »
Just for reference, our 69 tahiti with 425 horse turns 5100 rpm at 69 MPH on GPS.  I would think maybe your Tach is off.



this isnt a white boat with blue/pink/purple stripes is it????????

Nope, this is a red and white tahiti.  I'm having the pump rebuilt by Tim at Place Diverters and I'll post up the numbers in a few weeks after I can take the boat out and see how she runs with a new pump. 

GT Jets

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« Reply #5 on: March 06, 2018, 04:50:02 PM »
Alright guys, I need some help here. 

454BBC (passenger/2 bolt/ ~325HP). 
Berkeley JC pump. 

WOT - 4900 RPM & 46 MPH - Sea level with 4 adults
WOT - 5100 RPM & 50.6MPH - 3700' elevation - 1 adult.

Pulling a skier, the pump cavitates and doesn't produce much torque. 

Based on the above the assumption has been that the impeller was a C cut, which was causing the high RPMs and cavitation from a stop under load.  I was getting ready to send the pump out to get rebuilt with a new impeller so I pulled it apart and this is what I found inside.  A2 cut impeller, what looks to me like clean leading edges, no obvious issues.  So what gives?  Why are my RPMs so high and having trouble with the holeshot?   

Now I have no clue what to do with the pump rebuild.  I'm glad I might save some money on not needing a new impeller, but at a loss for performance issues.


Run an A impeller, or get yours cleaned up and cut it for a new undersize wear ring. Looking at your RPM and speed references, it also looks like she runs lean as hell if it runs harder at altitude.

When you get the pump back from Tim, you may consider looking at the carburetor for issues....

JMO

GT
  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Time to man up and yank it John!  :banghead:
Ray

71BeaterBoat

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« Reply #6 on: March 19, 2018, 10:34:25 PM »
Got the boat back in the water today after re-installing the rebuilt pump and redoing the interior over the last couple of months. 

Lake Perris: 2 adults 2 kids.

WOT: 4800 rpm @ 48.5mph. 
Heritage AA impeller and rebuild by Tim @ Place Diverters.  Boat runs strong from the hole, and I'm happy with the performance I was seeing today.

Based on the numbers maybe I was premature on the rebuild, because I'm not that far off from where I was to begin with but now I know that I've got a good pump that'll last me for a good number of seasons and it's just one less thing to think about while I haul my kids around exploring. 

GT Jets

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« Reply #7 on: March 19, 2018, 10:57:04 PM »
Got the boat back in the water today after re-installing the rebuilt pump and redoing the interior over the last couple of months. 

Lake Perris: 2 adults 2 kids.

WOT: 4800 rpm @ 48.5mph. 
Heritage AA impeller and rebuild by Tim @ Place Diverters.  Boat runs strong from the hole, and I'm happy with the performance I was seeing today.

Based on the numbers maybe I was premature on the rebuild, because I'm not that far off from where I was to begin with but now I know that I've got a good pump that'll last me for a good number of seasons and it's just one less thing to think about while I haul my kids around exploring.

Unless that thing is built to the hilt, calling bullshit on the 4,800RPM. That would require 450 or so HP, If I had a 450 HP 19' boat that only went 48 mph I would be pissed..... Your tach is wrong and the tune is way off...JMO Not being a douche, just trying to help...



GT
  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Time to man up and yank it John!  :banghead:
Ray

71BeaterBoat

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« Reply #8 on: March 19, 2018, 11:03:51 PM »
Unless that thing is built to the hilt, calling bullshit on the 4,800RPM. That would require 450 or so HP, If I had a 450 HP 19' boat that only went 48 mph I would be pissed..... Your tach is wrong and the tune is way off...JMO Not being a douche, just trying to help...



GT


Thanks for the input.  The tach is gonna be my next project then. 


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GT Jets

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« Reply #9 on: March 19, 2018, 11:24:57 PM »

Thanks for the input.  The tach is gonna be my next project then. 


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Not knowing what you are working with, I would gestimate closer to 4,200-4,400 RPM

GT
  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Time to man up and yank it John!  :banghead:
Ray

71BeaterBoat

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« Reply #10 on: March 20, 2018, 09:54:18 AM »
Not knowing what you are working with, I would gestimate closer to 4,200-4,400 RPM

GT

AA heritage impeller.  325HP BBC. 

I've started a new thread to help me get this figured out.  (http://www.socaljetboats.com/engine-mechanical-electrical/tach-reading-high-where-to-start-troubleshooting/msg337871/#msg337871)  I'd be happy to hear any advice on where to start on getting this fixed. 

GT Jets

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« Reply #11 on: March 20, 2018, 02:27:31 PM »
AA heritage impeller.  325HP BBC. 

I've started a new thread to help me get this figured out.  (http://www.socaljetboats.com/engine-mechanical-electrical/tach-reading-high-where-to-start-troubleshooting/msg337871/#msg337871)  I'd be happy to hear any advice on where to start on getting this fixed.


How will this become an epic thread if you start a new one????  ;D

I hit you with a quick Q&A on your new thread...


GT
  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Time to man up and yank it John!  :banghead:
Ray

 


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