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Old 03-18-2009, 01:13 AM
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Cavitation, simply put, is a vapor bubble or indentation in a liquid caused by low pressure or vacuum.

When the pump impeller tries to push out more oil than it can actually suck in it creates a low vapor pressure and makes a bubble around the impeller blades. It results in a situation where the pump isnt pumping oil because it cant get a sufficient supply for one reason or another, usually a restricted pickup tube.

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Old 03-18-2009, 01:22 PM
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Ok thank you that makes sense.
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Old 03-18-2009, 05:38 PM
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ok heres an update guys, i pulled the motor and tore it down, its number 5 and 6 rod bearings they are complettely threw the copper and burnt, which exsplains the vibration in the foot feet lol, all the other bearings look good including main and cam bearings, but this may be the problem, the cam bearing that feeds 5 and 6 its turned and 3/4 of the oil hole is covered, could this be the ongoing problem with bearings in this motor, i didnt get to check it out myself the first time so i dont know what it looked like then, also last rebuild had the rods resized so will i nead to have them resized again when i get a new crank? the crank is ruind and already been turned 20/20 do you guys recommend new rods aswell? thanks
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Old 03-18-2009, 06:27 PM
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New rods new crank and new machinist that knows his stuff..have the crank magnafluxed before any machine work and checked for straight..Make sure the rods are magnafluxed as well..probably x-ray is out of the question..align hone the block prior to assembly and make sure it is throughly clean..Get a good book on building your flavor of motor as well..Balancing is mandatory for a race engine..Check clearances with mike and plastigauge..lot more work goes into a race motor as all of this is intended to help the motor live..This is just block prep have not talked about oiling and heads yet..

BTW pull all the freeze plugs oil gallery plus and such before sending it to the shop..left em in once and I will never make that mistake again..

good luck
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Old 03-18-2009, 06:53 PM
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thanks, do you think the cam bearing caused this issue?
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Old 03-18-2009, 07:20 PM
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Quote:
Originally Posted by bracketracer
thanks, do you think the cam bearing caused this issue?
A spun cam bearing may have been the culprit ..dunno for sure..

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