2012 Ducati Streetfighter S Engine
The Testastretta Evoluzione 1098 Superbike Engine
The Testastretta Evoluzione engine is immediately recognisable by its
compact cylinders and cylinder heads. Other innovations and revisions
are less obvious as they reside inside the Evoluzione's engine cases,
but whether external or internal, every new development was conceived
to create a lighter, more efficient, more powerful and ultra-compact
engine.
The 1098 capacity is a result of a
significant increase in the bore and stroke of the Evoluzione motor.
Highly ‘over-square’, it now sports a big 104mm bore and a relatively
short 64.7mm strokeThe Streetfighter S engine capacity is the
result of the bore and stroke of the
Evoluzione motor. Highly 'over-square', it sports big bores and
relatively short strokes. To optimise the benefits of the new, big
Ducati Twins, the redesigned cylinder heads combine with advanced
MotoGP induction technology, to offer intoxicating power delivery.
The Evoluzione features a narrow angle between intake and exhaust
valves allowing highly efficient, straight intake ducts and newly
shaped combustion chambers that contain racing size 'R' valves operated
by radical 'R' derived camshafts.
After
optimising the Evoluzione cylinder heads, engineers focussed upon
releasing the potential of the new design by feeding them with
MotoGP-derived elliptical throttle bodies. With a 30% increase in air
flow over conventional throttle bodies, the new elliptical shape
contributes a substantial increase in power to the record-breaking
motors. Streetfighter owners will feel the power of this
MotoGP technology on the road.
The Testastretta Evoluzione engines are the lightest ever used in a naked Ducati
Superbike, thanks to close scrutiny of every engine component. New
cylinder heads benefit from fewer components and include magnesium
covers to achieve a weight-saving of over 3kg (6.5+lbs) in the heads
alone. By reducing the weight of many other components, including
transmission gears and the gear selector drum as well as the oil pump
and primary gears, a staggering total reduction of 5 kg (11.1 lbs) for
the 1098cc engine over it's predecessor engine is achieved.
Furthermore, the vacuum die-cast process also used in the 848 and 1198 crank cases ensures consistent and precise wall thickness and increased strength from absolute material purity while reducing weight by a further 3kg (6.5lbs) compared to those of the 1098 Superbike.
power curve for the streetfighter 848 and streetfighter S - click here
Streetfighter Sound
The massive Streetfighter exhaust system uses 1mm thickness tubing from 58mm to 63mm diameter.
It employs 2 lambda probes for precise fuel mapping and an electronic valve to achieve an optimum spread of power.
The cylindrical mufflers sport the same finishes as the Superbike family:
Brushed steel for the Streetfighter and black for the Steetfighter S.