The M158 engine is homologated to meet the
strictest environmental regulations, EU5 and LEV2.
Despite the increase of power compared to the
other Mercedes-AMG V12 engines developed
for Pagani, CO2 emissions as well as the fuel
consumption have been reduced, tomake
the Huayra class leading amongst 12 cylinder
sports cars with values that are respective of
much smaller vehicles in the market. The two
stage fuel supply system features two
microprocessor controlled pumps feeding fuel
to the engine with the second pump only
activated when necessary, thus reducing the
energy required to run the fuel pumps and
eliminates the waste of excessive fuel being
transported and heated in the fuel lines.
This efficiency combined with a large 85 liter
fuel tank ensure Huayra’s grand touring ability.
As an homage to the decennial tradition of
Mercedes-AMG in building world class sports
carengines, the M158 displays the historic
AMG emblem on the intake manifold alongside
thename of the technician that assembled
the engine by hand at the Mercedes-AMG
headquarters in Affalterbach, Germany.
The Titanium exhaust system has been
engineered by MHG-Fahrzeugtechnik and
is a direct application of race proven
technologies on a high performance road car
and the complete exhaust weighs less than 10 kg.
Hydroformed junctions are used to reduce back
pressure and guarantee a free flow of the exhaust
gasses. Titanium guarantees a low weight in
the mufflerarea while Inconel guarantees reliability
on the parts of the exhaust more exposed to
high temperatures. Careful attention has been
paid to the tuning of its sound, which has led to
aharmonic rumble at idle speeds with a hint of
the power that lies hidden at low speed and a
deep thunderous growl of motor and air,
reminiscent of an airplane, at high speeds.
—The power and prodigious torque generated
by Huayra’s V12 are transferred to the wheels
through a transverse sequential seven speed
gearbox and a dual plate clutch and the complete
gearbox weighs only 96 kg. Keeping the weight
of the rear overhang as low as possible has been
a priority as we aim for a neutral behavior at the
limit. A further benefit of this layout isa better
behavior of the car during a rear impact. A dual
clutch system was evaluated but ultimately not
selected as it would have increased the weight
by approximately 70 kg, thus negating any minor
improvement in shift-time.
Xtrac already supplied the gearbox for the
Zonda R and so it was the natural choice for the
development of a new high performance gearbox.
Xtrac’s expertise in motorsports was obvious
throughout the design and material selection
processes that resulted in the strongest and
lightest gearbox possible suitable for road use,
with a synchromesh box that offers comfort levels
a race car gearbox will never be able to offer.
The suspension geometry has been designed
to further enhance the sure-footed nature already
present in the Zonda on the longer wheelbase
Huayra. The individual suspension made with
forged AvionAl double A-arms have been tested
extensively on the Zonda R programme.
Incorporated into the wheel hub assemblies are
cooling ducts that connect directly to the support
brackets, thus extending the reliability and lifespan
of the bearings. Pushrod operated adjustable
Öhlins shock absorbers keep everything under
control and have been optimized forthe dynamic
requirements of the vehicle.
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