4445
T
emperament
| Engine
Integrated dry-sump lubrication.
Integrated dry
-sump lubrication ensures
a reliable supply of oil even when a
sport y driving st yle is adopted. It also
has additional cooling functions.
The oil tank is located in the engine,
thereby eliminating the need for an
external oil tank, which saves both space
and weight. To reduce power loss and
increase efficiency, an electronically
controlled oil pump supplies the lubricat -
ing points inside the engine as and
when required. When demand is low, the
oil pump is operated at reduced power,
thereby saving fuel.
Air intake system.
The resonance intake system increases
the intake volume by exploiting the fact
that air oscillates as it passes through
the intake manifold. The system can
adjust to engine speed. Benefits of this
include higher torque at low engine
speeds and a flat ter torque curve. The
911 Carrera S models operate a t wo -
stage system.
The entire intake system is made from
light weight plastic. In the 911 Carrera
models, the resonator volume of the air
filter housing varies with engine speed to
bring added character to the engine
sound, which becomes much more
powerful at higher rpm.
Exhaust system.
The exhaust system of the 911 Carrera
models is a concept that delivers a clear
statement, not only in terms of
acoustics.
The stainless steel exhaust system com-
prises two distinctive and independent
exhaust tracts. The cataly tic converters
heat up rapidly for effective emissions
reduction.
A selectable t wo -tract sports exhaust
system featuring distinctive polished
stainless steel tailpipes is available as
an option. Activated by a but ton, it
produces an even more intensive sports
car sound.
Engine management system.
The EMS SDI 9.1 engine management
system ensures optimum engine perfor -
mance at all times. It controls, for
example, the position of the electronic
throt tle valve (ETC) – a prerequisite for
compatibility with the Porsche Stability
Management (PSM), which comes as
standard. It also regulates all engine -
related functions to achieve optimum
fuel consumption, emissions and power
output whatever the driving st yle.
Another function is the cylinder -specific
knock control. Since the cylinders never
all work under exactly the same condi -
tions, the knock control function monitors
each one separately. The ignition point
is shifted individually, as and when
necessary, to protect the cylinders and
pistons at high engine speeds.
For compliance with EU standards, the
on -board diagnostics detect any faults
and defects that may occur in the exhaust
and fuel systems and then notify the
driver immediately. This also prevents
increased pollutant emissions and
unnecessary fuel consumption.
For fuel consumption, CO2 emissions and efficiency class, please refer to pages 141/143.
Twin tailpipe of the spor ts exhaust system Single
-tube tailpipe on the 911 Carrera
Twin tailpipe on the 911 Carrera S
