Re: How much demand is there for PV8C oil pump adapter kits?

Posted by PackardV8 On 2008/11/6 22:45:34

Owen.
The late 56 plugged pump is only slightly better than the early pump. The plug in the late 56 pump eleminates SMALL amounts of air that can be drawn at that point in the early pump whre the PR port is not plugged.

The problem with BOTH pumps is that the input shaft wears PREMATURELY AND WEARS the PUMP bore that the input shaft spins in. Air is sucked at the worn clearence that occurs between the input shaft and the pump as well as at the pressure relief valve port if it is not plugged. However, based on my experiments the amount of air sucked at the PR valve port is minimal.

As a side note: Too fully understand this one must come to grips with the fact that the pressure relief circuit of each, all, and every Packard factory V8 oil pump is ALWAYS subjected to the SUCTION SIDE OF THE PUMP. This is also true of nearly ALL other oil pumps among all manufactureres going back into the 30's. At NO TIME nor at NO point does oil leave the pump when the pressure relkief valve opens. If the pump is an early pump with the hash pipe campaign then oil is sucked UP THE HASH PIPE and INTO the pump. NOT out of it. NOT down the hash pipe.


Let me put it another way:
As originaly designed by PMCC:
Once oil enters the pump it can leave from ONE place, EXACTLY ONE place, and ONLY one place. That one place is out thru the mounting flange where it is supposed to go. There is also an extremely tiny amount of oil exuded at the shaft to keep it lubricated.

One disclaimer: The vacuum pump requires a VERY SMALL amount of oil that is supplied from the oil pump. That is the only exception. Oil Pumps without the vacuum pump will adhere to my above explanation.