Alfa Romeo Twin Cam engine
| Alfa Romeo Twin Cam engine | |
|---|---|
 |
|
| Overview | |
| Manufacturer | Alfa Romeo |
| Production | 1954–1994 |
| Combustion chamber | |
| Configuration | DOHC 2-valve I4 |
| Displacement | 1.3 L (1290 cc/78 in³) 1.6 L (1570 cc/95 in³) 1.8 L (1779 cc/108 in³) 2.0 L (1962 cc/119 in³) |
| Cylinder block alloy | aluminium alloy |
| Cylinder head alloy | aluminium alloy |
| Combustion | |
| Fuel type | Petrol |
| Cooling system | Watercooled |
| Chronology | |
| Successor | Alfa Romeo TwinSpark |
The all alloy Alfa Romeo Twin Cam engine series was an Inline-four engine produced by Alfa Romeo from 1954 to 1994. For earlier Alfa Romeo engines featuring twin camshafts, refer to the main Alfa Romeo page. For the later 8 or 16-valve Twin Spark engines which also feature twin camshafts, please refer to the Alfa Romeo Twin Spark engine page.
The Alfa Romeo Twin Cam engine was introduced in the 1290 cc Giulietta of 1954. The features of the Giulietta engine included:
This made the Alfa Romeo Twin Cam engine an advanced design for a production car of the mid-1950s. These design features, with minor variations, would form the basis of all future versions of the engine. The capacity was increased to 1570 cc with the introduction of the Giulia in 1962. Racing versions of the Giulia engine, include the twin plug engine used in the GTA which featured a cylinder head with two spark plugs per cylinder.
The twin cam engine was later increased to 1779 cc for the 1750 GTV and Berlina in 1968. The 1962 cc engine was introduced in 1971 for the 2000 GTV and Berlina 2000. Twin spark plug versions of the 1750 and 2000 were used for racing and there were a limited number of racing engines fitted with a 16 valve cylinder head.
In 1986, a turbocharged version of the 1779 cc single plug engine was fitted to the Alfa Romeo 75, providing 155 PS (114 kW; 153 bhp) in standard form and a potential for a power output of 300 bhp (220 kW) in Group A touring car racing form.
In 1987, the Alfa Romeo 75 was fitted with a twin spark plug per cylinder head design, which provides improved fuel ignition and allows an improved combustion chamber shape with narrower angle between intake and exhaust valve. This was combined with variable valve timing and electronic fuel injection to give a power output of 148 PS (109 kW; 146 bhp).
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