Maserati 4200cc F136 UC - F136 UD

Engine Overhaul

Technical Description

TIMING ADJUSTMENT SYSTEM The adoption of continuous timing variators on the intake camshafts mean that 82% of torque is available from 2500 rpm. This translates into exceptional pick-up capacity even with long gears, allowing comfortable driving on motorway journeys and, in general, the engine's full potential can be exploited over the entire operating range. The timing of the intake camshafts can be modified continuously between maximum retarded and maximum advanced position. Angular rotation: 25°±0.25’ corresponding to 50 crankshaft degrees. Oil volume for complete actuation: 15.54 cm 3

1. 2. 3. 4. 5. 6. 7. 8.

Stator

Fastening pin

Fastening screws

Cogwheel

Rotor

Rear flange Clock spring Front flange

The Variable Valve Timing (VVT) system uses a hydraulic actuator on each intake camshaft which is operated by engine oil pressure (low pressure type). The VVT actuator consists of a external part (stator), which is fixed to the timing gear, and an internal part (rotor), which is fitted on the intake camshaft. The mutual shape of rotor and stator internally create different chambers: four advancing chambers and four retarding chambers. The division of oil pressure in the advancing chambers and retarding chambers determines the position of the VVT-actuator.

Advancing channel Retarding channel

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