Oil pump

3

31 RPU

Senior Member
Is there really any advantage to the later oil pump with the larger hole compared to the earlier pumps with the smaller hole? Does the larger hole allow more volume of oil to flow?
 
I don't think Ford would have made the change for the heck of it, but there are thousands and thousands with the smaller hole working just fine. I don't worry about it in my car.
 
I'm with Mike. The majority of Model-A engines today have multi-viscosity oil and are kept in garages where extreme cold start-ups are not an issue like it was in the 30's when the hole needed to be large enough to get thick oil thru.
 
Since the Model A oil pump is simply a lift pump to get oil into the valve chamber, where the overflow goes onto the cam gear and down the return pipe, adding to the overflow serves no purpose.
 
If you are concerned, enlarge the holes. I do that on the intake and outlet sides. Best done in a mill. I also turn the shaft down between the bearing surfaces to .375".
 
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