Alfa Romeo Flat-4 engine
| Alfa Romeo Boxer engine | |
|---|---|
 |
|
| Overview | |
| Manufacturer | Alfa Romeo |
| Production | 1971–1997 |
| Combustion chamber | |
| Configuration | DOHC 2/4-valve H4 |
| Displacement |
|
| Cylinder block alloy | Cast iron |
| Cylinder head alloy | Aluminium alloy |
| Combustion | |
| Fuel system | 1 or 2 carburetors Bosch LE 3.1 Jetronic |
| Fuel type | Petrol |
| Oil system | 4-4.5 L |
| Cooling system | Water cooled |
| Output | |
| Power output | 63 PS (46 kW)–137 PS (101 kW) |
| Chronology | |
| Successor | Twin Spark engine |
The Alfa Romeo Boxer engine was a water-cooled flat-4 piston engine developed by Alfa Romeo for front-wheel drive, longitudinal applications. It debuted on the Alfasud, which was introduced in 1971 at the Turin Motor Show. In the following decades the Boxer went through several upgrades and powered many Alfa Romeo front-wheel drive cars up to 1996 (not the 164). In 1997 it was phased out and replaced by the transverse-mounted Twin Spark engines.
This liquid-cooled, four cylinder, boxer (horizontally opposed) engine had a belt-driven water pump. Its integrated cast iron cylinder block and crankcase had three main bearings. The two aluminum alloy crossflow cylinder heads had one or two overhead camshaft in each, driven by individual timing belts, and two valves per cylinder (four valves per cylinder in the 1700 16V version). Wet sump lubrication.
The fuel delivery system depended on version: a single-barrel downdraft carburetor; one or two double-barrel downdraft carburetors; or Bosch LE 3.1 Jetronic fuel injection.
The original engine displaced 1.2 L (1,186 cc) with an 80 mm bore and 59 mm stroke and produced between 63 and 77 PS (46 and 57 kW).
Applications:
The engine was stroked (to 64 mm) to create the 1.3 L (1,286 cc) version. This engine produced 68–75 PS (50–55 kW).
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