In a 4-stroke normally aspirated piston engine at altitude, which of the following causes the air-fuel mixture to enter the
cylinders?

Question

In a 4-stroke normally aspirated piston engine at altitude, which of the following causes the air-fuel mixture to enter the 
 cylinders?

Accepted Answer

The difference between ambient pressure and pressure inside the cylinder.

Answer

compression from devices downstream of the carburettor

Answer

The difference between ambient pressure and exhaust back pressure

Answer

compression from devices upstream of the carburettor.

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