noun (Automotive engineering: Vehicle components, Engine, transmission, and exhaust) Direct injection is a diesel engine injection system in which the fuel is injected directly into the engine cylinder. ⇒ Direct injection diesel engines will often start from cold with relative ease. ⇒ With direct injection, the fuel enters the cylinder late in the compression stroke. ⇒ In a direct injection system, the fuel is injected directly into the combustion chamber above the piston.
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