SoCal Jet Boats

Tech Talk => Engine Mechanical / Electrical => Topic started by: soron3842 on September 05, 2011, 09:34:57 PM

Title: any ideas
Post by: soron3842 on September 05, 2011, 09:34:57 PM

I just got my boat running and out on the water this weekend it has a 455 olds with a 12jc Berkley pump a impeller I GPS my speed and can only seem to get 35 mph any ideas why thats all I'm getting

Title: Re: any ideas
Post by: Duke on September 05, 2011, 09:38:30 PM

what kind of boat, and what rpm's were you spinning. i'd have to guess its the pump from the info above. . . . or you left your anchor out buahaha jk

Title: Re: any ideas
Post by: crewchief22 on September 06, 2011, 06:03:24 AM

1. Look for debris in the pump.
2. Confirm engine RPM
3. Replace ebay GPS  ;)

Title: any ideas
Post by: HomeBlown57 on September 06, 2011, 06:34:45 AM

Is it revving but not going? Or is it not revving?

Title: Re: any ideas
Post by: soron3842 on September 06, 2011, 07:55:26 AM

if i had to guess i would say im running around 4500 to 5000 rpm i dont think my tach is reading right it revs up and runs great i used my garmin gps unit to check speed it has allways been dead nuts in my truck i am thinking my pump is probably wore out what impeller should i be running ?

Title: Re: any ideas
Post by: soron3842 on September 06, 2011, 08:13:26 AM

its a 73 fiberform malibu-jet 19ft

Title: Re: any ideas
Post by: flathammered on September 06, 2011, 02:50:26 PM

is there any vibration

Title: Re: any ideas
Post by: soron3842 on September 06, 2011, 04:05:13 PM

yes there is some vibration now that you mention it not much tho

Title: Re: any ideas
Post by: GlassCutter on September 06, 2011, 04:53:31 PM

You guys are getting better, props to you all!  This has been up for almost an hour and nobody mentioned that it might just be an "Olds" thing.  You guys are A-OK   ;D

And yeah it sounds like the pump is worn out.

Title: Re: any ideas
Post by: soron3842 on September 06, 2011, 05:05:56 PM

Yes thank you all for not  olds lol  ^-^ and thank you everyone for all your input and help you are all a great group of guys

Title: Re: any ideas
Post by: soron3842 on September 06, 2011, 05:21:50 PM

Lol thank you for not ragging on my olds !