worst case scenario... pump overload??
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worst case scenario... pump overload??

  1. #1
    Senior Member matt1840's Avatar
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    Default worst case scenario... pump overload??

    long story short... speeding down river tower boat cuts me off comin in opposite direction, my boat catches air motor bounces off the limiter i land and pump bites in hard...

    what can happen from something like this motor wise??? im sure something.. ticking sounds like its comin from top end.. possibly rockers? motor didnt freeze or quit running i was able to get underway immediatly after letting the boat settle.

    anyone? im gonna start tear down tonite just a few ideas of things to look for? oil pressure still at a solid 50psi...



    since motors out... may as well machine the intake
    Last edited by matt1840; 06-10-2010 at 06:05 PM.
    Matt 74 tahiti 468 olds 72 mph.
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    Horsepower sells Engines lefty's pride's Avatar
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    what rpm do you have the limiter set to?
    did you see what rpm it hit
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    Senior Member matt1840's Avatar
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    Quote Originally Posted by lefty's pride View Post
    what rpm do you have the limiter set to?
    did you see what rpm it hit
    rev limiter is set to 4900 rpm.

    and yes it smacked it lol
    Matt 74 tahiti 468 olds 72 mph.
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    Senior Member fleetimus's Avatar
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    Start at the top and work your way down. I would check everything, including bearings.

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    Senior Member W.O.T's Avatar
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    4900? I dont see how anything could be hurt from that unless something was on its way out already. Unloading is hard on the impeller and crank. I would pull the valve covers and take a look before I did too much work.
    Last edited by W.O.T; 06-10-2010 at 06:37 PM.

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    Senior Member matt1840's Avatar
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    Quote Originally Posted by W.O.T View Post
    4900? I dont see how anything could be hurt from that unless something was on its way out already. Unloading is hard on the impeller and crank. I would pull the valve covers and take a look before I did too much work.
    its an olds lol what do you expect 6500? lol.. im only turning 46-4700rpm but getting 74 mph lol..

    doubt i wiped a berring pressure still at 50psi. but ill check if i dont find anything else..
    Last edited by matt1840; 06-10-2010 at 06:43 PM.
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    Cas
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    the other thing to check is for a crack or 2 in the headers. Sometimes a little crack can cause a ticking sound that resonates elsewhere.

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    Horsepower sells Engines lefty's pride's Avatar
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    ya totaly see that hapining all that weight up there bouncing when you hit the water again pulling on the bolts and making a leak id start there especialy if you have fiber gaskets
    "Horsepower sells Engines but torque wins races."
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    Glendale Arizona Squirtcha?'s Avatar
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    Quote Originally Posted by Cas View Post
    the other thing to check is for a crack or 2 in the headers. Sometimes a little crack can cause a ticking sound that resonates elsewhere.
    Good point Steve. Just a header gasket piece getting spit out can make it tick too.

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    Senior Member glastornjet73's Avatar
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    Quote Originally Posted by matt1840 View Post
    its an olds lol what do you expect 6500? lol.. im only turning 46-4700rpm but getting 74 mph lol..

    doubt i wiped a berring pressure still at 50psi. but ill check if i dont find anything else..
    i turn mine 5100 with and "a" what impeller are you using i have kinda wondered if i should go bigger i have seen 70 on the gps but i feel with a little timing and bailing the tool box anchor seats ect it will do 71

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    Senior Member Futs's Avatar
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    I would start with the push rods. The weakest link in an olds deal.

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    Senior Member matt1840's Avatar
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    Quote Originally Posted by glastornjet73 View Post
    i turn mine 5100 with and "a" what impeller are you using i have kinda wondered if i should go bigger i have seen 70 on the gps but i feel with a little timing and bailing the tool box anchor seats ect it will do 71


    im turning 74 mph at 46-4700 rpm with an A2 impeller... keeps the rpms low and outa that 5500 danger zone lol. Id like to get an A and possibly hit 77 78 but i dunno ill put a rideplate and aftermarket loader first.

    ill check headers as well... great opinions keep em comin!!
    Last edited by matt1840; 06-10-2010 at 07:33 PM.
    Matt 74 tahiti 468 olds 72 mph.
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    Senior Member H20MOFO's Avatar
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    Quote Originally Posted by matt1840 View Post


    im turning 74 mph at 46-4700 rpm with an A2 impeller... keeps the rpms low and outa that 5500 danger zone lol. Id like to get an A and possibly hit 77 78 but i dunno ill put a rideplate and aftermarket loader first.

    ill check headers as well... great opinions keep em comin!!
    What kind of impeller are you running? Unloading an aluminum impy ...and then loading it back up...could send you for a swim.
    Another Hot Boat refugee

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    Senior Member moneysucker's Avatar
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    in my olds I had the top of a piston break off which made sleightly more noise than a ticking sound. I also broke off a valve which was crushed up and spit out only losing 1000Rpm on the way back to the dock. I would guess header leak.
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