Vacuum Pump Opinion

ch1ll said

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there is already a vacuum created in the crankcase without a pump. The pump significantly increases vacuum and pulls the rings tight to the cylinder walls. I know the theory and how it works. If it is pulling oil off the crankshaft, it pulling it off the cylinder walls as well.

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How is there a vacuum in the crankcase without a pump or similar? There isn’t. And it has to do with pressure differential. Nothing gets “sucked” off of anything. To make it simple, the second ring is a scraper. It scrapes the oil off the cylinder wall. The oil ring catches the oil and sends it through the holes or slots in the piston back to the crankcase. What causes that is a pressure differential. The difference in pressure between the high pressure (combustion pressure) and the relative pressure in the crankcase. The higher the pressure differential, the more effective the rings are. The more effective the rings are, the thinner they can be. The thinner they are, the more power you make. There isn’t a vacuum in the crankcase unless you make a vacuum in the crankcase.