Elements of a Gasoline Engine


All gasoline engines mounted on Toyota automobiles are four-stroke engines. Four-stroke engines operate by continuous and regular repetition of the following sequence:

1. Intake stroke

2. Compression stroke

3. Combustion stroke

4. Exhaust stroke

Basic principle of four-stroke engine

In order for an engine to operate smoothly under a wide range of operating conditions, the following three conditions must be satisfied:

Good air-fuel mixture

Good compression

Good spark

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