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The oil pump is literally the heart of an engine's lubrication system. It sucks oil in from the crankcase and pushes it through the filter and oil galleries to the crankshaft and camshaft bearings. A constant supply of oil is needed to support and cool the bearings. If for any reason the pump cannot keep the oil circulating, it's the end of the road for the engine. So let's see how well you know your oil pumps. Answer the following: True or False - The oil pump creates oil pressure in the engine. If you answered "False," you answered correctly. Now go treat yourself to a snack or a soda from the nearest vending machine - unless of course you can't get a hall pass at this moment. The oil pump doesn't actually create oil pressure. All the pump does is displace oil and push it into the oil galleys so it can flow to the bearings and upper valvetrain. What actually creates the oil pressure is the resistance the oil encounters as it circulates through the engine. Most manufacturers recommend a minimum of 10 psi of oil pressure for every 1,000 rpm of engine speed. Using these numbers, most stock engines have about 50 to 60 psi of oil pressure. But some engines need more. Let's Talk Types There are three basic types of oil pumps:
Twin gear pumps, also called "external" pumps, use a pair of intermeshing gears to pump oil. One gear is driven by a shaft and the second gear is driven by the first gear. The pump ...
The oil pump is literally the heart of an engine's lubrication system. It sucks oil in from the crankcase and pushes it through the filter and oil galleries to the crankshaft and camshaft bearings. A constant supply of oil is needed to support and cool the bearings. If for any reason the pump cannot keep the oil circulating, it's the end of the road for the engine. So let's see how well you know your oil pumps. Answer the following: True or False - The oil pump creates oil pressure in the engine. 
If you answered "False," you answered correctly. Now go treat yourself to a snack or a soda from the nearest vending machine - unless of course you can't get a hall pass at this moment. The oil pump doesn't actually create oil pressure. All the pump does is displace oil and push it into the oil galleys so it can flow to the bearings and upper valvetrain. What actually creates the oil pressure is the resistance the oil encounters as it circulates through the engine. Most manufacturers recommend a minimum of 10 psi of oil pressure for every 1,000 rpm of engine speed. Using these numbers, most stock engines have about 50 to 60 psi of oil pressure. But some engines need more. Let's Talk Types