The cylinder walls of a four-stroke cycle internal combustion piston engine are often lubricated with oil splashed up from the _________. The oil is kept out of the combustion chamber by the _________.

The cylinder walls of a four-stroke cycle internal combustion piston engine are often lubricated with oil splashed up from the _________. The oil is kept out of the combustion chamber by the _________.



Answer: Crank case,Piston rings


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