SoCal Jet Boats

Tech Talk => Jet Pumps => Topic started by: Ckaz21 on January 27, 2014, 03:24:25 PM

Title: Maxium HP and RPM's for aluminum impeller?
Post by: Ckaz21 on January 27, 2014, 03:24:25 PM

Is it really that dangerous to run an aluminum impeller with over 500hp and over 4,800 rpms? Has anyone actually had one of them shatter?

Title: Re: Maxium HP and RPM's for aluminum impeller?
Post by: Flusher on January 27, 2014, 04:11:57 PM

They crack between the vanes and the shroud on the exit side.  Mostly from hydraulic shock when the pump loads.  If you let it go unchecked long enough, chunks of the vanes could break off and damage the bowl.  When the pump unloads, you have to take your foot out of it before it takes a gulp.  Driving style plays a big part.  If you baby it, it will never break.  If you beat on it, it will eventually give it up.

My stock 304 shaft twisted the splines before my MPD detailed Berkeley B+ gave up.

When you upgrade to a SS impeller, you will want to upgrade your shaft to 17-4.

Title: Re: Maxium HP and RPM's for aluminum impeller?
Post by: jamiemwedmore1234 on January 27, 2014, 06:00:49 PM

I'm spinning 5600 rpms and around 600 hp on a stock A impeller and it's defiantly showing signs of abuse and major cavitation cause of lack of water   


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Title: Re: Maxium HP and RPM's for aluminum impeller?
Post by: Ckaz21 on January 28, 2014, 03:25:23 PM

Thanks for the info guys. Looks like I'll end up having to go stainless. My impeller is already pretty beat as well.

Title: Re: Maxium HP and RPM's for aluminum impeller?
Post by: beerjet on January 28, 2014, 03:52:55 PM

Go bronze.....

-beerjet-

Title: Re: Maxium HP and RPM's for aluminum impeller?
Post by: Riverlife_ on January 28, 2014, 04:07:41 PM

What's the pro's and cons for
 bronze vs S.S? They seem pretty close in price.


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Title: Re: Maxium HP and RPM's for aluminum impeller?
Post by: jamiemwedmore1234 on January 28, 2014, 05:58:45 PM

Quote from: Riverlife_ on January 28, 2014, 04:07:41 PM

What's the pro's and cons for
 bronze vs S.S? They seem pretty close in price.


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b-1 racing will sell you a ss for the price of a bronze one ss can be repaired bronze not so much 


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Title: Re: Maxium HP and RPM's for aluminum impeller?
Post by: chrisx2 on January 30, 2014, 06:17:08 AM

I've got a Berk JE with a new 17-4 shaft and inducer and am looking for an SS "A" impeller.  You say B-1 racing?  Do they have a website or phone #?  I couldn't fine them on the web, but probably just me.   :banghead:

Title: Re: Maxium HP and RPM's for aluminum impeller?
Post by: jamiemwedmore1234 on January 30, 2014, 06:30:51 PM

Quote from: chrisx2 on January 30, 2014, 06:17:08 AM

I've got a Berk JE with a new 17-4 shaft and inducer and am looking for an SS "A" impeller.  You say B-1 racing?  Do they have a website or phone #?  I couldn't fine them on the web, but probably just me.   :banghead:

spoke to some one there for 30 min or so very knowable people I'm running the same pump as you and either b1 or mpd  are going to do the wrk I've had mpd wrk on my last boat he as we'll good on pump wrk


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Title: Re: Maxium HP and RPM's for aluminum impeller?
Post by: Flusher on February 04, 2014, 11:32:08 PM

Quote from: chrisx2 on January 30, 2014, 06:17:08 AM

I've got a Berk JE with a new 17-4 shaft and inducer and am looking for an SS "A" impeller.  You say B-1 racing?  Do they have a website or phone #?  I couldn't fine them on the web, but probably just me.   :banghead:

http://www.b1racing.net/Contact-Us.html (http://www.b1racing.net/Contact-Us.html)

Title: Re: Maxium HP and RPM's for aluminum impeller?
Post by: chrisx2 on February 07, 2014, 06:09:45 AM

Thanks abunch flusher........now to convince the wife.....Hmmm :o