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Ferrari Cars ›› Ferrari 550 Maranello ›› Drivetrain
Ferrari 550 Maranello Drivetrain
Engine:
The 550 Maranello engine is a 5.6 liter, 518lb unit with 12 cylinders in a 65° V, that delivers almost all its torque from 3000rpm. Maximum power is 485bhp at 7000rpm, peak torque is 420lb-ft at 5000rpm, compression ratio is 10.8:1, all controlled by a Bosch Motronic M5.2 management system. The cylinder block, head, and oil sump are light alloy. The damp press-fitted aluminum cylinder liners are of Nikasil. The crankshaft is supported by seven journals on anti-friction bearings. The con rods are light titanium alloy allowing counter-weighting of the crankshaft to be lightened, improving response and balance. The Mahle-forged aluminum alloy pistons enhance thermodynamic efficiency. Lubrication is by a cooled dry sump system. The four-valve per cylinder head is fitted with hydraulic tappets. This system helps to curb emissions, makes periodic adjustment almost unnecessary, and guarantees consistent engine performance.
Intake:
Ferrari developed a torque- and power-enhancing variable geometry intake for the 550 Maranello's engine. The Ferrari patented system alters the fluodynamics of the intake system through a third chamber linked to the manifold by 12 throttle valves with electropneumatic control. The additional chamber shapes air flow to enhance power and efficiency. The intake, like the injection and ignition systems, is managed by a Bosch Motronic 5.2 system for each row of cylinders, linked by a high speed serial line.
Exhaust:
The Maranello's insulated stainless steel exhaust system employs variable back pressure through bypass valves situated on the rear silencers. The bypass valves are electropneumatically actuated by the engine management system, based on engine speed and throttle opening. Varying back pressure makes it possible to optimize engine efficiency in various conditions. Greater back pressure allows higher torque under average load, while lower back pressure enhances full load engine efficiency.
Transmission:
For optimal weight distribution the 550 Maranello employs a transaxle system with integrated gearbox and differential. Drive is transmitted by the clutch to the gearbox through a three-bearing propeller shaft housed in a rigid steel tube linking the engine and the gearbox. The hydraulic single-plate dry clutch is flywheel-mounted. The gearbox has six dual-cone synchronized speeds, plus reverse, with pressurized and cooled lubrication. Gearbox control is the classic Ferrari type with an aluminum knob, lever and grooved selector; commands are transmitted by a rigid shift.
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