Wet sump
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Within piston engines, a wet sump is part of a lubrication system whereby the crankcase sump is used as an integral oil reservoir. An alternative system is the dry sump, whereby oil is pumped from a s
Interior and oil sump of an Tohatsu MFS30B outboard motor
Splash lubrication
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Splash lubrication is a rudimentary form of lubrication found in early engines and transmissions. Such engines could be external combustion engines, or internal combustion engines.
Wet sump
…engine, sitting atop the gearbox. Early stationary engines employed a small scoop on the extremity of the crankshaft or connecting rod to assist with the lubrication of the cylinder walls by means of a splashing action. Modern small engines, such as those used in lawnmowers, use a "slinger" (basically a paddle wheel…
An early Sabb engine that would have used splash lubrication.
The centre con-rod has a spade for splash lubrication.