Path of Engine Oil

marty in Ohio

marty in Ohio

Well-known member
Friend, Bob, is trying to follow the path of lube oil in a Model A engine. We thought we saw a diagram of where the oil goes in a running engine, but can't remember where. We know the pistons are lubed by the oil slinger, but where does the oil go otherwise. Anybody help us?
Marty
 
Oil is pumped into the valve chamber, then flows down tubes to feed the main bearings by gravity, and the excess overflows the valve chamber and fills the dipper trough in the pan to feed the rods. Not sure what you mean by "the oil slinger". The only slinger is at the rear of the crankshaft inside the rear main bearing and serves as a barrier to prevent oil from escaping out the rear of the engine. Pistons are lubed by oil splash from the rods.
 
I think the slinger Marty is referring to dippers on the rods? They do sling oil around and lube the cylinder walls. As far as flow path goes, the A is one of the simplest.
 
gravity and splash system,its like a monsoon in the crankcase.the greatest engineering overkill in a model a is the oil pump,capable of 100 psi,its used to lift the oil about 5 inches from the pan to the valve galley.
 
Regarding "Oil Slinger." I got that term from Les Andrews red book that says "the oil cap slinger must face the camshaft." This is on the cap on the bottom of the connecting rod. (Andrews book page 1-142) This dips oil out of the dipper trays to lube the cylinders walls. There is also a part called an oil slinger which fits on the front of the crankshaft. (Andrews, page 1-135) Sorry for any confusion.
Marty
 
The dippers likely do have cast off that lubes the cylinders & small ends of the con rods as well as cool the bottoms of the pistons but they are primarily there to lubricate the connecting rod big end journals. The dipping action actually creates a bit of oil pressure. If the mains would have been under pressure, they would last longer than they do. What's surprising is how well they last with just gravity flow.
 
rotorwrench said:
The dippers likely do have cast off that lubes the cylinders & small ends of the con rods as well as cool the bottoms of the pistons but they are primarily there to lubricate the connecting rod big end journals. The dipping action actually creates a bit of oil pressure. If the mains would have been under pressure, they would last longer than they do. What's surprising is how well they last with just gravity flow.
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" AGREE "

Herm.
 
marty in Ohio said:
Regarding "Oil Slinger." I got that term from Les Andrews red book that says "the oil cap slinger must face the camshaft." This is on the cap on the bottom of the connecting rod. (Andrews book page 1-142) This dips oil out of the dipper trays to lube the cylinders walls. There is also a part called an oil slinger which fits on the front of the crankshaft. (Andrews, page 1-135) Sorry for any confusion.
Marty
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That flat disc in front of the timing gear helps keep excess oil off the front (timing cover) seal. It's not in the right place to lube the cylinder walls.
 
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