Porsche Cayman User Handbook Manual page 17

Integrated dry-sump Oil-level indicator.
lubrication.
Both Cayman models have an
This proprietary Porsche electronic oil-level indicator as
technology ensures consistent part of the on-board computer
lubrication in even the most system. The reading is so precise
extreme high-speed corners. that a conventional dipstick is not
Oil is extracted from each of the required.
cylinder heads by a dedicated
scavenge pump. The oil return
system features narrow-section Engine cooling.
lines which de-foam the oil before
it is collected in the integral sump. Both flat-six engines have a
A third pump then feeds the oil cross-flow cooling system with
back to the lubrication points and all coolant channels cast in the
the cycle begins once more. A block. With no external hoses
stable oil pressure is maintained or pipework involved, the system
throughout the engine, even is much more secure than
during racetrack use. conventional designs.
Coolant is supplied separately
to each individual cylinder, so
it never arrives pre-warmed. As
well as maintaining a consistent
engine temperature, this means
the valves are much less
susceptible to wear. Important
benefits include greater engine
reliability, less risk of knocking,
better fuel economy, lower
emissions and reduced mechanical
noise.
· 36 ·
Engine management system
with electronic throttle.
The Motronic ME7.8 engine
management system is the
primary source of control for
all engine-related systems and
processes, e.g., ignition and
fuel supply. It is an essential
prerequisite for enhanced
performance in all operating
Input data
Cayman S
Engine speed (from crankshaft)
Inlet camshaft phase angle
Engine load
Throttle-pedal position
Oxygen sensor signals
Knock sensor signals
Temperatures
– coolant
– intake air
– engine oil
– air in engine compartment
Vehicle speed
Air-conditioning settings
Engine immobiliser status
Ambient pressure
Sport Chrono button
Moment interface to
Porsche Stability Management (PSM)
The new Cayman and the Cayman S |
conditions. The electronic throttle standard Porsche Stability
is not only more precise, it can Management (PSM), e.g., anti-slip
modulate the volume of incoming regulation (ASR) and the automatic
air to compensate for sudden load brake differential (ABD). Other
transfer (e.g., when lifting off the important functions include
throttle before braking). Electronic coordination and control of the
engine management ensures optional Tiptronic S transmission,
better power delivery from a the oxygen sensors in the exhaust,
standing start and a smoother rev- variable valve timing (VarioCam
limiter action. It also coordinates Plus) and cylinder-specific knock
the various sub-systems within the control.
Used to regulate/control
Ignition
Fuel injection
Idling via throttle
and ignition
Heating elements in oxygen sensors
Fuel-tank venting
Resonance valve in intake manifold
Twin-flow valve in intake manifold
Inlet camshaft phase angle
Inlet valve lift
Secondary air injection
Engine fan
Starter
Diagnostics
Air-conditioning compressor
CAN interface to instrument cluster,
transmission control unit, stability control system, etc.
· 37 ·
Drive