Porsche 911 911 Catalog page 19

Why it always pays
to take the direct route.
The new engine of the 911.
The latest 911 has a new genera- The results are outstanding
tion of engines with direct fuel performance and surprisingly low
injection (DFI), and significantly fuel consumption and emission
more power. 254 kW (345 hp) is values. All made possible thanks
generated by the 3.6-litre boxer to DFI, VarioCam Plus, an improved
(horizontally-opposed cylinder) lightweight construction, reduced
engine and 283 kW (385 hp) by friction and a number of detailed
the 3.8-litre power unit. technical solutions.
3.8-litre boxer engine
Direct fuel injection (DFI).
With millisecond precision, DFI
injects fuel at up to 120 bar directly
into the combustion chamber
by means of electromagnetically
actuated injection valves.
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The spray and cone angles have contain exactly the right mixture
been optimised for torque, at all times.
power output, fuel consumption
and emissions by enabling a At up to 3,200 rpm, the engine
homogeneous distribution of the operates with dual injection;
air/fuel mixture, and, therefore, at up to 2,500 rpm, it even works
effective combustion. With direct with triple injection. The required
injection, the EMS SDI 3.1 engine volume of fuel is distributed
control regulates injection timing between two or three sequential
individually for each cylinder as injections, respectively – for faster
well as the injection rate for each heating of the catalytic converters
cylinder bank. This optimises after a cold start and for greater
the combustion process and fuel torque in the upper load range.
economy. A hot-film air mass
meter takes care of the airflow, DFI improves the internal cooling of
so that the combustion chambers the combustion chamber by having
The new 911 |
the mixture prepared directly in
the cylinder. This allows for a higher
compression ratio (12.5:1) which
helps to deliver more output along
with enhanced engine efficiency.
It has therefore been possible to
reduce CO emissions by up
2
to 17%, depending on the model.
Injection is regulated by the elec-
tronic engine management system.
The exhaust gas cleaning system
ensures that emissions remain well
below even the strict limits of the
EU5 emission standard, thus
helping to protect the environment.
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Engine