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Crankcase dilution occurs when the fuel oil from the engine gets into the lube oil of the engine. This can be caused by the walls being wetted due to the fuel condensing in the cylinder. If the engine is cold, or there is an excess amount of cooling around the cylinder, [ 1 ] the fuel oil will condense and have a higher chance to end up in the ...
The Citroën 2CV boxer-twin engine took advantage of this pumping effect to maintain a partial vacuum inside the crankcase, in order to reduce oil leaks when an oil seal malfunctions. This was achieved by using a one-way valve (a leather or rubber flap over a hole in the crankcase), to let air escape the crankcase but not enter it.
The engines had only 10 fins for cooling, which caused them to run hot. Another problem was that oil would pool in the cylinder heads, causing it to leak into the valves and burn oil. [3] Another problem was that oil would pool in the crankcase rather than being pumped, causing the engine to overheat and seriously harm performance.
The Model W engine was Harley-Davidson's first flathead engine, [7] and its transmission was the first in a Harley-Davidson motorcycle to be housed in the engine cases. [6] [8] The transmission included helical gear drive, a wet clutch, and a three-speed gearbox. [8] The engine was a stressed member of the frame. [9] [10]
These blow-by gases, if not ventilated, inevitably condense and combine with the oil vapor present in the crankcase, forming oil sludge. Excessive crankcase pressure can furthermore lead to engine oil leaks past the crankshaft seals and other engine seals and gaskets. Therefore, it becomes imperative that a crankcase ventilation system be used.
Four-stroke engine - oil shown in yellow at the bottom. Most four-stroke engines use a crankcase that contains the engine's lubricating oil, as either a wet sump system or the less common dry sump system. Unlike a two-stroke (crankcase-compression) engine, the crankcase in a four-stroke engine is not used for the fuel/air mixture.
A dry-sump system is a method to manage the lubricating motor oil in four-stroke and large two-stroke piston driven internal combustion engines. The dry-sump system uses two or more oil pumps and a separate oil reservoir, as opposed to a conventional wet-sump system, which uses only the main sump (U.S.: oil
The Norton P10 was a prototype motorcycle designed by AMC in the 1960s. It used a unit construction 800 cc DOHC parallel twin engine. The model suffered from oil leaks and severe vibration during testing and was never put into production.
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