In order to solve the problem, the inlet ports of the
engines are fitted with air-feed flow sensors, which allow
for the divergence of air flow between the different
cylinders to be measured. This valuable data is
subsequently filtered for the most significant values, and
used as an input to control a hydraulic system for
actuating the inlet valves, with the aim of obtaining an
equal air-flow for each cylinder. CRF
also had the option to develop an electromagnetic system,
although the fact that such a system would not be
compatible with diesel engines rendered it futile.
Extensive fluid dynamic analyses have been used to
maximize the volumetric efficiency and performance of the UNIAIR
engines. The higher volumetric efficiency of the engines,
has direct and encouraging results on the reduction of
fuel consumption, sound levels, and in particular with the
diesel engines, emissions.
and life time of future Fiat group engines is also set to
improve from an already good base, with new development
technology in the areas of stress, vibration and
temperature analysis. In addition, the robust electro
hydraulic approach implemented by Fiat for the UNIAIR
system has an intrinsic fail safe nature.
results of the ten year project are stunning, with power
output increasing by 10-15% on average, whilst fuel
consumption drops by 8 to 10%. The latter improvement is
mainly due to the elimination of the conventional
butterfly throttle valve, a component that severely
reduces the ability for air flow to be optimized.
Consequently, UNIAIR technology allows for Euro 5
emissions standards to be met, and contributes to reducing
the environmental foot print of modern day motoring.
One of the first engines to receive the UNIAIR treatment
will be the 1.6 litre JTS engine, fitted to the Alfa Romeo
148. With UNIAIR technology, the 1.6 litre unit is
expected to boast an output of 150 bhp. UNIAIR engines are
also characterised by impressive low-end torque.
engines fitted with the technology bear the MULTIAIR tag,
and will also exude impressive power outputs per litre,
and ultra-low consumption figures.
the high performance side of the range, Alfa Romeo have been
developing a 3.2 litre twin-turbo V6 UNIAIR JTS, with a
power output of approximately 400 bhp. In this
application, the benefits of the UNIAIR system are clearly
evident, with the air-flow of the engine being far more
substantial, and influential. The first application of UNIAIR
for the Ferrari range of cars is expected to be with the
6.0 V12 direct injection engine, with an impressive 630