Engine Fuel And Fuel Metering Systems Oral Practice Test

Which statement best describes the spray strategy difference between direct injection and port injection?

Direct injection meters fuel at high pressure directly into the cylinder, while port injection sprays fuel at lower pressure into the intake port. Direct injection sprays fuel into the exhaust manifold. Port injection sprays fuel directly into the cylinder, while direct injection sprays into the intake port. Both are identical in spray strategy.

Correct Answer:

Direct injection meters fuel at high pressure directly into the cylinder, while port injection sprays fuel at lower pressure into the intake port.

Explanation:

Spray strategy is about where and how fuel is atomized and introduced into the engine. In direct injection, fuel is delivered at high pressure and injected directly into the combustion chamber, allowing precise metering and rapid vaporization inside the cylinder. In port injection, fuel is sprayed from injectors in the intake port at a lower pressure, where it mixes with incoming air in the intake manifold before entering the cylinder. That distinction is exactly captured by the statement: direct injection meters fuel at high pressure directly into the cylinder, while port injection sprays fuel at lower pressure into the intake port. The other descriptions mix up the spray locations or claim the systems are identical, which isn’t accurate.

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