· 45 ·
The 911 | Engine
911 Carrera 4
cle arance compensation
rem ains fu lly functional—a
condition that is crucial to
the power and emissions
characteristics of the engine.
To reduce power losses
and increase efficiency, an
electronically controlled oil
pump supplies oil to the
lubricating points inside the
engine as and when requ ired.
This means that the oil pump
does not work so hard when
there is less demand for
lubrication. The main benefit
of an on-demand oil-supp ly
system i s optimal eff iciency,
ensuring low fuel consumption
and reduced exhaust emissions.
Single-jet spray nozzles cool
the piston crowns w ith oil from
the main lubrication ci rcuit—
another detailed solution
that helps to reduce the
thermal load on the engine.
For the engine , all of these
detailed solutions mean
a consi stent supply of oil
regardless of g ravi tational
loads, even in the most
demanding track conditions.
Engine cooling system.
DFI and VarioCam Plus en able
a tremendous amount of power
to be pro duce d with reduced
emissions, fuel consumption
and noise. The same applies to
our efficient cross-flow cooling
system, as used in motorsport,
where each eng ine cylinder is
uniformly supp lied with coolant.
In the 3.8-liter engine, the higher
output demands a corresponding
increase in cooling. The solution
is a more powerful coolant
pump and a more efficient
oil/coolant heat exchanger
expanded by two additional fins.
Ignition.
The ignition system is
designed for static high-
voltage distribution. Individual
ignition coi ls on each of the
spark plugs ensure perfect
ignition every tim e.
English 
