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30
Resonance Intake Manifold
The new boxer engines benefit from
the resonance effect. It’s used to
oscillate the air mass inside the intake
manifold for improved air induction. In
turn, it helps optimize the formation of
the air/fuel mixture. In the Cayman S,
the manifold is also equipped with
a switchable resonance valve.
The results are high torque, a uniform
torque curve, and high power output.
The sound produced is characteristically
resonant and deep.
Direct Fuel Injection (DFI)
In both new Cayman engines, Direct Fuel
Injection (DFI) is standard. Multi-hole
injectors deliver fuel directly into the
combustion chamber with millisecond
precision. The injection pattern has been
optimized for torque, power output, fuel
consumption, and emissions. Combustion
is even more effective as a result.
With direct injection, the engine
management system regulates injection
timing individually for each cylinder as
well as the injection rate for each cylinder
bank. This optimizes the combustion
process and therefore fuel economy.
Depending on the engine operating
condition, multiple fuel injections take
place so that the catalytic converter
reaches normal operating temperature
sooner after a cold start and a greater
top-end torque can be achieved.
DFI improves the internal cooling of
the combustion chamber by having the
mixture prepared directly in the cylinder.
This allows for a higher compression
ratio, which helps to deliver greater power
output at the same time as enhanced
engine efficiency. Injection is regulated
by the electronic engine management
system and emissions are monitored
by the stereo lambda sensors, thus
helping to protect the environment.
Drive
|
Engine
VarioCam Plus
By adjusting the intake camshafts
and switching the lift of the intake
valves, VarioCam Plus transforms the
characteristics of the engine. So much
so, it’s like getting two engines in one.
The system first differentiates between
driver inputs that typify normal,
everyday driving and those inputs
that demand maximum performance.
The electronic engine management
system then imperceptibly adapts valve
operation to the prevailing conditions.
This results in instant acceleration
and extremely smooth running.
In short, VarioCam Plus provides
excellent acceleration power with
comparatively low fuel consumption.
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