Turbo Direct Injection

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Volkswagen's Turbo Direct Injection (TDI) is a turbocharged and intercooled diesel engine with direct fuel injection.

Direct injection diesel engines operate by having the fuel injector arranged to inject fuel directly into the engine's cylinder, as opposed to indirect injection diesel engines, where the fuel is injected into a pre-combustion chamber. The reduced material volume of the direct injection diesel engine reduces heat losses and thereby increases engine efficiency, at the expense of increased combustion noise. A direct injection engine is also easier to start when cold, due to the reduced heat loss of the design.

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