SoCal Jet Boats

Tech Talk => Jet Pumps => Topic started by: BBF-ER on October 02, 2016, 11:49:08 AM

Title: My Berk jet, what do i got.
Post by: BBF-ER on October 02, 2016, 11:49:08 AM

Hey SCJB,
Awhile back i picked up a 1976, 19ft. Hallett bubble deck jet boat with a 455 and a Berk jet w/ droop snoop.
Numbers on Berk are 12 JA-B-H. Can anyone tell me if this set up is a good one for this boat.
I don't know if any internal upgrades were made.
Thanks.

Title: Re: My Berk jet, what do i got.
Post by: mash on it on October 02, 2016, 12:59:22 PM

I've heard of an "A" pump, but never seen one.

A "B" pump has a split bowl. Maybe that's what it is, I don't know.

The "B", in that position, {12JA-B-H} usually designates a "B" impeller, Not usually the best choice for a stock Olds.

Most Olds Had an "A" impeller, and some with an "A2" impeller. You can put as much HP as you can afford in front of it.  :thumbup:

Pics would help

And welcome to the madness.

Dan'l

Title: Re: My Berk jet, what do i got.
Post by: BBF-ER on October 02, 2016, 01:45:04 PM

Thanks for the reply, I will send pics later.
It is a split bowl.If i got it correct, would a "B" pump have a "B" impeller?
Sorry for lame questions, its all new to me.
Its all good madness on SCJB.

Title: Re: My Berk jet, what do i got.
Post by: mash on it on October 02, 2016, 02:01:50 PM

Quote from: BBF-ER on October 02, 2016, 01:45:04 PM

Thanks for the reply, I will send pics later.
It is a split bowl.If i got it correct, would a "B" pump have a "B" impeller?
Sorry for lame questions, its all new to me.
Its all good madness on SCJB.

JA
JB
JC
JE
JF
JG
JI

These are the pump model

Any one of these can have an A2, A, B, C... cut impeller in it.
The letter in the tag is what it was shipped with, in 1976. Mine was shipped/built with an "A", (1976 also) and has had a A2 for 15+ years.

Dan'l

Title: Re: My Berk jet, what do i got.
Post by: BBF-ER on October 02, 2016, 02:45:49 PM

Got it, understanding more.
For a boat like mine(heavy), What would change in performance with "A" impeller
compared to "B" impeller. Hole shot, rpm ?

Title: Re: My Berk jet, what do i got.
Post by: mash on it on October 02, 2016, 03:07:30 PM

there is a lil more to it than that.

Also depends on use of the boat.

Knowing whats in the pump is important, too.

thats where i'd start.

Dan'l

Title: Re: My Berk jet, what do i got.
Post by: BBF-ER on October 02, 2016, 03:25:36 PM

Thats what i will do, thanks for the info and your time.
Understanding more every time i talk with you guys at So Cal Jet Boats.
Thanks Dan'l.