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Some information about the engine of F355
TECHNICAL
Some techical info of the F355
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For the F355, Ferrari developed a new 90° V8 213.3 cu.
in. engine with an 3.35 x 3.03 in bore and stroke. This power unit develops 375 bhp at
8250 rpm and revs up to 8500 rpm. Its maximum torque is 268 Lb. ft. at 6000 rpm. At 109
bhp/litre, this engine develops the highest specific power unit.
Timing is by four overhead cams with tapered lateral intake cams valves designed
especially for Ferrari and 5 valves per cylinder (3 radial intake, 2 exhaust). In order to
reduce exhaust emissions and maintenance flexibility, hydraulic tappets with automatic
play take-up appear for the first time on engines with revs above 8000 rpm. In addition.
the variable rigidity valve double springs raise the resonance potential state to over
10,000 rpm.
The pistons are made of a forged aluminum alloy with a distinctly lower than average
apparent density (K = 0.44) and are coupled with Nikasil-coated "wet" steel
liners. These are wet-sunk into the aluminum engine block. For optimum engine efficiency
at high speeds the F355 adopts Ti6al4V titanium alloy, finite element designed conrods
previously only seen on Formula 1 engines.
The F355 also features Bosch Motronic M2.7 electronic injection-static ignition
management. The dry sump engine oil circuit incorporates twin scavenge and one pressure
pump plus a thermostatic control valve.
The outstanding performance of the new engine can be synthesized by the 109 bhp/litre
achieved with a displacement of 213.3 cu. in.. The parameters by which engine quality is
assessed attain the very highest standards. The brake mean effective pressure (BMEP) which
represents thermal stress, is equal to 1.5 kg/em2. The mean piston speed (Cm), which
indicates mechanical stress, is equal to 21.8 m/sec. Weight, reliability and easy
maintenance are the outstanding characteristics of this engine, which develops 375 bhp at
8500 rpm.
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