What type of fuel or mixture does a two-stroke combustion engine need to run?

Question

DentroTest · Accepted Answer

Two-stroke internal combustion engines do not have an independent lubrication circuit with a closed oil crankcase like that of four-stroke engines. For this reason, the oil needed to lubricate the piston, the cylinder, the crankshaft and the bearings must enter together with the fuel. This is achieved by using a suitable mixture of gasoline and oil, either prepared beforehand in the fuel tank or metered automatically by a pump from an auxiliary oil tank. Using only pure gasoline would cause the engine to seize immediately from lack of lubrication, while diesel (gas oil) is not suitable for Otto-cycle engines with spark-plug ignition.

What type of fuel or mixture does a two-stroke combustion engine need to run?

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