Question

In a four-stroke engine, the timing gears control A. the amount of fuel that reaches the cylinder. B. when the spark plug fires. C. when the valves open and close. D. the speed of the air flow through the carburetor.

Answer 1

In a four-stroke engine, the timing gears control when the valves open and close.

Answer is C. When the valves open and close.

Wrong answer is A,B,and D.

it will help you

Answer 2

Answer:

C. when the valve open and closes

Explanation:

Timing gears are connected from the crankshaft to the camshaft by means of either chains, belts or gears. The camshaft is driven by the crankshaft and the gear train controls and operates the valve timing to open and close the inlet valve and the outlet valve at the proper timings. The valve timings of the  opening and closing of the valves are very important otherwise it will lead to the poor intake and exhaust of the charges inside the cylinder. This make the engine less efficient.