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Torp

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Berkeley 12JC impeller question
« on: August 10, 2017, 06:50:10 am »
I apologize in advance ...
Im a total newbie to jet boats and pumps and will probably have more than my share of questions along the way.

I'm trying to put a pump together from parts.
Most of the parts i should probably throw in the scrap mans pile lol

Anyway, my first issue is the impeller is missing a blade or two.
I have another that looks really good , At least to a newbies eyes but is shaped a little different.
and the blades don't appear as long.

I am going to attempt to post a picture of them side by side.
Could someone tell me if it's ok to use it or should i buy a new one?
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jim brock

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Re: Berkeley 12JC impeller question
« Reply #1 on: August 10, 2017, 11:14:05 am »
the one on the left  looks like a  b/c and on thr right looks like a A.
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Torp

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Re: Berkeley 12JC impeller question
« Reply #2 on: August 11, 2017, 08:52:23 am »
Thanks for the info jim.
So if i understand the bare basics and keep things very simple...
I could use that impeller and the effects of that would be a change in peak rpm of the engine?

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jwt0bos

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Re: Berkeley 12JC impeller question
« Reply #3 on: August 13, 2017, 06:19:42 am »
George Pataki would be one of the experts who could give you a thorough and reliable answer. I was going to but these impellers have other differences besides blade length.
  • Boat #1: Early 70's 16' Tahiti or clone  (I don't know)
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69kona

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Re: Berkeley 12JC impeller question
« Reply #4 on: August 13, 2017, 07:21:14 am »
George Pataki would be one of the experts who could give you a thorough and reliable answer. I was going to but these impellers have other differences besides blade length.
Only cut size ..not much more differences . Possibly wear ring clearance ..


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GT Jets

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Re: Berkeley 12JC impeller question
« Reply #5 on: August 13, 2017, 08:53:37 am »
I apologize in advance ...
Im a total newbie to jet boats and pumps and will probably have more than my share of questions along the way.

I'm trying to put a pump together from parts.
Most of the parts i should probably throw in the scrap mans pile lol

Anyway, my first issue is the impeller is missing a blade or two.
I have another that looks really good , At least to a newbies eyes but is shaped a little different.
and the blades don't appear as long.

I am going to attempt to post a picture of them side by side.
Could someone tell me if it's ok to use it or should i buy a new one?

Depending on how much budget you have to play with, I would recommend buying an impeller and a matching wear ring.

It's my opinion that the impeller on the left versus the impeller in the right are VERY different, I totally agree with Mr. Brock that the left one looks like about a "C" cut and the right about an"A". The difference is crazy. If you know cars, it would be like going from a 3.55:1 to a 4.56:1 gear ratio in a car...

I have some impellers depending where you are that may work well for your application. Honestly, I would recommend spending a few hundred bucks and get a kit. If you don't have the cash to build it once, you really won't have the cash to build it twice... Do it right the first time and you won't have to touch it for several seasons....

JMHO.

Fill us in on what you have to work with such as hull type, engine displacement, estimated HP and what you plan on doing with the boat.... Maybe someone has some better junk than you do that can help you out...(Not being offensive, just one man's junk is an others treasure...LOL)

Good luck with the repair...

GT
  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
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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

Torp

  • Karma: +0/-0
Re: Berkeley 12JC impeller question
« Reply #6 on: August 14, 2017, 06:53:35 am »
A quick over view goes something like this...
I actually am a car guy and wanted a jet boat to turn some wrenches on versus a turn key.
So after not seeing any jet boats for sale in years...i found two for cheap and bought them both.

I'm sure some of you can relate to the NEGATIVE enthusiasm your significant other expresses when you drag two of these things home and park them on the lawn lol

One was a 460 ford powered Glastron carlson And the other a olds / Chevy powered Wriedt spoiler
I parted out the carlson it was just too far gone for rot and damage but ran perfect.
so i kept the wriedt and have some spare parts for my project.
And it is a project...it has sat for like 18 years so nothing i'm headed to the lake with this weekend lol

The wriedt appears to have had another set of motor mount holes where the engine mounts , so i assumed maybe they blew up the previous ford or olds and put the present 454 in.

So thats my story...

If i was to buy a new impeller kit Is there a middle of the road future proof choice that would run decent in the lake and have flexibility for a better engine later?

The engine i have now is stock but that can change any time.
So putting the pump together now, Then building a new engine over the winter would probably be a waste if i chose the wrong impeller size.


Where would you suggest i check for impeller kits?
Is there any good online shops? Do they sell after market ones that are better or is a stock Berkeley best?
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mash on it

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Re: Berkeley 12JC impeller question
« Reply #7 on: August 14, 2017, 02:03:43 pm »
Mostly stock 454? An "A" Impeller.

Tom @ Jet Boat Performance:
http://www.jetboatperformance.biz/pages/impellers.html

CP Performance:
http://www.cpperformance.com/

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

GT Jets

  • Karma: +192/-0
Re: Berkeley 12JC impeller question
« Reply #8 on: August 14, 2017, 10:57:13 pm »
Mostly stock 454? An "A" Impeller.

Tom @ Jet Boat Performance:
http://www.jetboatperformance.biz/pages/impellers.html

CP Performance:
http://www.cpperformance.com/

Dan'l


Yup, you really can't miss with an A cut.

Even if you increase your stock horsepower to 500 you will still be OK with an Aluminum A as long as it don't need crazy RPM to do it....

If you are going to shoot for 500+ by too much, or have to spin that impeller at 6K to do it, I recommend going mag bronze at the minimum or stainless  steel if you are looking to make redonculous power....


The value in a new impeller can really be felt in buying a complete rebuild kit, it saves you about $150 in sourcing stuff individually...

Good luck, and I have no idea what you mean about the significant other bitching, pissing and moaning about bringing home a boat, or two, or seven....

No idea at all, I think you need to work on your boat hiding skills.....    :screwy: :screwy: :screwy:

 ;D

GT
  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
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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

Torp

  • Karma: +0/-0
Re: Berkeley 12JC impeller question
« Reply #9 on: August 15, 2017, 03:34:45 pm »
Thanks guys for the advice
I had to grit my teeth a little but managed to click the place oder now button.

A little over $400 is worth knowing everything is new in there.

I do need to work on my stealthy boat hiding skills...
But i got the lying part practiced up pretty good :)

But honey...its probably only gonna be $120 bucks or so for the parts..
Course if she gets to the mailbox before i do and opens the credit card bill i wont ever eat or get laid again lol


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SleekCraft9308

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Re: Berkeley 12JC impeller question
« Reply #10 on: July 20, 2019, 11:14:13 pm »

Yup, you really can't miss with an A cut.

Even if you increase your stock horsepower to 500 you will still be OK with an Aluminum A as long as it don't need crazy RPM to do it....

If you are going to shoot for 500+ by too much, or have to spin that impeller at 6K to do it, I recommend going mag bronze at the minimum or stainless  steel if you are looking to make redonculous power....


The value in a new impeller can really be felt in buying a complete rebuild kit, it saves you about $150 in sourcing stuff individually...

Good luck, and I have no idea what you mean about the significant other bitching, pissing and moaning about bringing home a boat, or two, or seven....

No idea at all, I think you need to work on your boat hiding skills.....    :screwy: :screwy: :screwy:

 ;D

GT
Lol . I tried to hide my projects until she yelled in front of my friend about $40. Bucks n he laughed you mean $400, bucks . I’m still in trouble


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SleekCraft9308

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Re: Berkeley 12JC impeller question
« Reply #11 on: July 22, 2019, 01:02:17 pm »

Yup, you really can't miss with an A cut.

Even if you increase your stock horsepower to 500 you will still be OK with an Aluminum A as long as it don't need crazy RPM to do it....

If you are going to shoot for 500+ by too much, or have to spin that impeller at 6K to do it, I recommend going mag bronze at the minimum or stainless  steel if you are looking to make redonculous power....


The value in a new impeller can really be felt in buying a complete rebuild kit, it saves you about $150 in sourcing stuff individually...

Good luck, and I have no idea what you mean about the significant other bitching, pissing and moaning about bringing home a boat, or two, or seven....

No idea at all, I think you need to work on your boat hiding skills.....    :screwy: :screwy: :screwy:

 ;D

GT
Thank you


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