Description

DESCRIPTION

Four cylinder in line engine with double camshaft in head, four valves per cylinder, phase variator, static injection and twin ignition controlled by a single ECU.

The rear engine is connected to the clutch-gearbox-differential unit which constitutes a sole assembly. The engine is installed frontally and transverse at a 18°30 slant. The engine is "suspended" by means of two damper mounts to the underbody and one scissors mount to the suspension crossmember. To contain vibrations, the engine top is connected to the underbody by means of a shock-proof connecting rod.

All belts are fitted with automatic take-up devices to ensure long belt working life.

The fuel feed system (unleaded petrol) is fitted with suitable pollution prevention devices which ensure low exhaust emissions as per "EEC PHASE 2" standards.

AR 32301 engines are fitted with a plastic intake manifold with variable geometry instead of an aluminium intake manifold. The fuel feed system is returnless, i.e. with a single feed pipe.

CRANKCASE

The engine block is made of high mechanical resistance cast iron.

The crankshaft is supported by means of five main journals which house five thin casing half-bearings. The cylinders are directly cut into the crankcase and are selected according to three size classes plus three oversized classes.

Two counter-rotating shafts, supported by means of a central bushing and ball bearings in the front and rear parts are housed in the crankcase.

Specific ducts in the crankcase walls ensure the passage of coolant and lubrication oil.

A nozzle, which sprays oils on the top of the piston thus ensuring partial cooling, is fitted in the lower part of each cylinder.