Quote:
Originally Posted by James Rogers
Bob, the theory behind the oil tube is kind of like the water pump on a Model T, it doesn't have one. Sounds bad but Model t's never had a water pump and in good shape won't overheat in the hottest weather. The oil tube in an A completes the flow from the sump to the valve galley to the pan. Oil being used from the bottom of the pan creates a slight suction from the drop in level when the oil is pumped to the valve chamber. This suction creates a slight pull at the tube which is submerged in the oil in the pan. This completes the circulation of oil. If you don't think your motor won't leak without the tube, just remove it and see. Ask me how I know this.
This just shows that what we think shouldn't work sometimes is the only way it will work. Like the thermosyphon of a Model T.
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That suction if it exists wouldn't amount to a hill of beans in my opinion. Oil is constantly falling back into the pan to maintain its level.