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the heat generated by the mixture burned in the engine must be transferred from the iron or aluminum cylinder to the water jacket .the outside of the water jacket dissipates some of the heat to the air surrounding it .
friction is very important for an automobile .without the aid of friction,an automobile could not move itself.Excessive friction in the engine,however,would mean rapid destruction.
Lubricants are usually made from the same crude oil from which gasoline is obtained.The petroleum oils are compounded with animal fats,vegetable oils and other ingredients to produce satisfatory oils and greases for automtive use.
The purpose of ignition system is to supply to the spark plugs,high-voltage surges.Furthermore,this system must provide these surges or sparks to the correct cylinder of the engine at the proper time in its operating cycle for most efficient combustion.
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