Engine – Mechanics; Development Of The 1.9-Liter Tdi Engine With Pump - Volkswagen 1.9-Liter TDI Owner's Manual

Engine – Mechanics
2
Development of the
1.9-Liter TDI Engine with
Pump Injection System
The new 100 bhp (74 kW) 1.9-liter TDI
engine with pump injection system was
developed from the existing 109 bhp (81
kW) 1.9-liter TDI engine with a distributor
injection pump and no intermediate shaft.
The pump injection system comprises the
only significant difference between the
two engines.
This Self-Study Program concerns
the design and function of the new pump
injection system, and the modifications
to the fuel system, engine management
system, and engine mechanical
components to accommodate the system.
A diesel engine with the pump injection
system has the following advantages over
an engine with a distributor injection pump:
• Low combustion noise.
• Low fuel consumption.
• Clean emissions.
SSP209/005
• High efficiency.
These advantages are attributable to:
• The high injection pressures of up to
27,846 psi (192,000 kPa / 1,920 bar).
• Precise control of the injection cycle.
• The pre-injection phase.