Re: 55-56 oil pump
Posted by Craig Hendrickson On 2014/5/4 18:25:22
Riki Quote:
There are THREE other significant problems with the original Packard oil pump that your "fixes" do not address:
1) Inadequate oil pumping volume due to the the spur gear design. Packard on the left, Pontiac high volume on the right (Olds HV is essentially the same as the Pontiac).
2) Poor design of the oil pressure relief sleeve valve and spring. The sleeve is too short and has inadequate bearing surface to hold it square in its hole. Once the sleeve valve gets slightly cocked in an open position, the small relief spring has inadequate force to push it back into closed (full pressure) position. Packard on the top, Olds HV on the bottom.
3) The bottom of the Packard oil pump is 3 INCHES above the bottom of the pan due to allowing room for the vacuum pump whether it is used or not. At the very least this puts the thru-hole for the driveshaft above the oil level in the pan, allowing the pump to suck in air rather than oil if the hole is worn. It also requires the pump to pull against a 3IN hydraulic head whereas if the pump bottom is 1/4in from the bottom (like the Olds conversion), there is no hydraulic head to overcome. Sorry, no side-by-side picture of this.
No amount of fiddling with the driveshaft, bottom plate thickness, etc. will fix these deficiencies. The only real solution is to use the Olds conversion.
Craig
wherever that saying about 2 piece shaft being for alignment is false..
in my opinion that is, the problem with pump..but will see when its running....
There are THREE other significant problems with the original Packard oil pump that your "fixes" do not address:
1) Inadequate oil pumping volume due to the the spur gear design. Packard on the left, Pontiac high volume on the right (Olds HV is essentially the same as the Pontiac).
2) Poor design of the oil pressure relief sleeve valve and spring. The sleeve is too short and has inadequate bearing surface to hold it square in its hole. Once the sleeve valve gets slightly cocked in an open position, the small relief spring has inadequate force to push it back into closed (full pressure) position. Packard on the top, Olds HV on the bottom.
3) The bottom of the Packard oil pump is 3 INCHES above the bottom of the pan due to allowing room for the vacuum pump whether it is used or not. At the very least this puts the thru-hole for the driveshaft above the oil level in the pan, allowing the pump to suck in air rather than oil if the hole is worn. It also requires the pump to pull against a 3IN hydraulic head whereas if the pump bottom is 1/4in from the bottom (like the Olds conversion), there is no hydraulic head to overcome. Sorry, no side-by-side picture of this.
No amount of fiddling with the driveshaft, bottom plate thickness, etc. will fix these deficiencies. The only real solution is to use the Olds conversion.
Craig
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