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The Volkswagen Group mainstream marques used unit injector systems (branded ”Pumpe Düse”, [14] commonly abbreviated to ”PD”) in their Suction Diesel Injection (SDI) and Turbocharged Direct Injection (TDI) diesel engines, [15] however this fuel injection method has been superseded by a common-rail design, such as the new 1.6 TDI.
TDI is the combination of two existing diesel engine technologies: Direct injection — where a fuel injector sprays the diesel fuel directly into the main combustion chambers . This causes a more complete combustion process than using a pre-combustion chamber (known as indirect injection ), which therefore increases the torque output and ...
This inline three-cylinder Turbocharged direct injection (TDI) diesel engine is the powerplant of the Volkswagen Lupo 3L and Audi A2 3L, with a low fuel consumption of only 2.99 L/100 km (94.5 mpg ‑imp; 78.7 mpg ‑US) – hence the "3L" tag.
The early version used 5-hole injector nozzles, the latest has 7-hole injector nozzles for better emissions and fuel economy. 79 mm (3.1 in) 86 mm (3.4 in) 1,686 cc (102.9 cu in) 74 kW (101 PS) 16 Valve DOHC A17DTL A17DTN After the ISUZU Polska factory went under full GM ownership, the engine marking changed to A17.
The term fuel injection is vague and comprises various distinct systems with fundamentally different functional principles. The only thing all fuel injection systems have in common is the absence of carburetion. There are two main functional principles of mixture formation systems for internal combustion engines: internal and external.
Central to the EUI is the built-in plunger pump, which, just as in a UI, allows for low-pressure fuel delivery and return to all injectors, yet provides exceptionally high pressure and concomitant injection and atomization of the fuel to a cylinder during the engine's power cycles. As in a UI, the injector is connected to common banks of fuel ...
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