hv ero 1.8 eco ja 1.8 uusi

Nappasin muutaman kohdan tuon 1.8 koneen kehityksestä kertovasta dokumentistä. Muutoksia on paljon, eli puhutaan täysin uudesta moottorista joka perustuu 1.6 twinport:iin

The design concept of the new 1.8 l engine,
Figure 2, is based on the all new 1.6 l Twinport engine.
New subsystems as cam phasers, an
oil-water heat exchanger, piston spray
nozzles, an intake manifold with variable
runner length, a new exhaust manifold as
well as a standardized oil pan module were
integrated. The base engine was adjusted
to higher load.

While the reduction of the fuel consumption
was clearly the top development
priority for the 1.6 l Twinport engine, the
optimization of the full-load behaviour was
added as another development focus for
the new 1.8 l engine.

the Engine Management
System was modified in the form of a higher
computing power and additional sensors.

Comparing the present engine to the previous one, the volumetric
efficiency was increased in the lower and medium speed
range by up to 11 % and up to 15 % at maximum speed. Special
attention may be dedicated to the almost constant course of
volumetric efficiency at high speeds, which demonstrates potential
for further power optimization, Figure 10.
The maximum torque (175 Nm/3800 rpm) and the maximum
power (103 kW/ 6300 rpm) could be increased by 6 or 14 % respectively.
Thus, an excellent weight-to-power ratio of 1.14
kg/kW was achieved.
The implemented measures for full load optimization ensure
a top position among comparable competitor’s engines, Figure
12.

Vaikka uuden tehot ja vääntö on parantunut niin kulutus on silti laskenut.

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