In January 1990 a quad-cam 16-valve version of the venerable boxer was introduced it was the most powerful to date, with 129–137 PS (95–101 kW) with or without catalytic converters. October 1986 – 1989 Alfa Romeo Sprint.In October 1986 the engine was increased in size to 1.7 L (1,712 cc) (104 cu.in), it was used in the 33 and later Sprints, power was between 105 and 118 PS (77 and 87 kW). This is the largest engine to have been installed in Alfasuds. It was built until 1995 and produced 84 to 105 PS (62 to 77 kW). It produced 75–86 PS (55–63 kW) with one or two double-barrel carburettors. The 1.4 L (1,351 cc) was usually labelled a "1.3" in spite of its displacement. The Alfasud was nonetheless never exported to the United States. A version of this engine (engine type 901.U0) was fitted with a catalytic converter, air injection, and evaporative emissions controls and received Californian emissions certification in 1976. The engine was stroked up to 64 mm (2.52 in) to create the 1.3 L (1,286 cc) version. 1983–1986 Alfa Romeo 33 (late versions for export only).1984–1986 Nissan Cherry Europe (rebadged Alfa Romeo Arna, sold also as Nissan Pulsar Milano on the Japanese market).or Bosch Motronic ML 4.1 fuel injection (16 valve engines). The fuel delivery system depended on version: a single-barrel downdraft carburetor one or two double-barrel downdraft carburetors Bosch LE 3.1 Jetronic fuel injection (8 valve engines). 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). Its integrated cast iron cylinder block and crankcase had three main bearings. This liquid-cooled, four cylinder, boxer (horizontally opposed) engine had a belt-driven water pump. In 1997 it was phased out and replaced by the transversely-mounted Twin Spark engines. 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). It debuted on the Alfasud, which was introduced in 1971 at the Turin Motor Show. The Alfa Romeo Boxer engine was a water-cooled flat-4 piston engine developed by Alfa Romeo for front-wheel drive, longitudinal applications.
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