Maserati 4200cc F136 UC - F136 UD

Engine Overhaul

Technical Description

The division of oil pressure in the advancing chambers and retarding chambers determines the position of the VVT-actuator.

ACTUATOR CONTROL

Each VVT-actuator is regulated by a solenoid valve which controls the oil supply towards the advancing chambers and retarding chambers.

To VVT-actuator (advancing) To VVT-actuator (retarding)

Oil supply

The solenoid valves are controlled directly by the engine control module (NCM) by means of a PWM signal (pulse width modulation) and on the basis of programmed mapping (which depends on the engine load and RPM). The engine control module constantly monitors the actual position of the VVT-actuators by comparing the signals from the crankshaft position sensor and the camshaft position sensors. When the oil control solenoid valve is in its rest position, the oil supply is connected to the retarding channel, while the advancing side circuit is drained towards the sump.

ACTUATION MODE

50°

INTAKE

EXHAUST

Variator deactivated: Timing -15° Variator activated Timing 35°

Maserati Academy

17