Porsche 911 Carrera 4 Brochure & Specs page 22

Integrated dry-sump The oil reservoir is located inside
lubrication.
the engine, making an external
tank unnecessary. Four oil pumps
The purpose of integrated dry- remove the oil from the cylinder
sump lubrication is to guarantee a heads directly into the oil sump. A
reliable oil supply while reducing fifth pump in the oil sump directly
engine temperatures, even in supplies the lubricating points in
sportily driven cars. the engine.
To prevent foaming, the oil is
channelled through cylinders
known as swirlpots. In this way,
optimum lubrication is guaranteed
at all times and the oil pressure is
always maintained at the neces-
sary level in order to ensure, for
example, that hydraulic valve
lubricating points inside the
engine as and when required.
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 supply system is optimum
efficiency, which ensures low
fuel consumption and reduced
exhaust emissions.
Single-jet spray nozzles cool the
piston crowns with oil from the
main lubrication circuit – another
detailed solution that helps to
reduce the thermal load on the
engine.
For the engine, all of these de-
tailed solutions mean a consistent
supply of oil regardless of gravi-
tational loads, even in the most
demanding track conditions.
911 Carrera 4
clearance compensation remains
Engine cooling system.
fully functional – a condition that
is crucial to the power and emis-
sion characteristics of the engine. DFI and VarioCam Plus enable
a tremendous amount of power
To reduce power losses and in- to be produced with reduced
crease efficiency, an electronically emissions, fuel consumption and
controlled oil pump supplies the noise. The same applies to our
The 911 |
Engine
efficient cross-flow cooling
system, as used in motorsport,
where each engine cylinder is
uniformly supplied with coolant.
In the 3.8-litre 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 coils on each
of the spark plugs ensure perfect
ignition every time.