Balancing Countershafts; Continuous Cam Variable Timing System - Alfa Romeo 159 Training Material

ENGINE

Balancing countershafts

FUNCTION: The engine is equipped with two balancing countershafts to improving riding comfort in terms of noise
and vibrations. These eliminate the reciprocating forces typical of four cylinder in-line engines that the crankshaft
counterweights cannot balance.
MATERIAL: The rotating countershafts are made of cast iron.
FEATURES: The two countershafts with cast iron balancing counterweights ensure high performance in terms of
noise and vibration containment. They are located inside the crankcase and controlled by the countershaft chain. The
countershaft gear teeth are provided with damper rings which additionally reduce the noise from the chain. The
coolant pump is part of this chain driving system. The countershafts run at double speed in the opposite direction.
These ensure regular and smooth engine rotation.
1. Countershaft gear
2. Countershaft retainer bearing
3. Countershaft
4. Countershaft bearing

Continuous cam variable timing system

Variable timing control valve
Traccia Didattica Alfa 159-en-ridotta
ALFA 159 TRAINING MATERIAL
Variable timing system
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