Alfa Romeo Boxer engine


The Alfa Romeo Boxer engine is a water-cooled flat-4 piston engine, developed by Alfa Romeo for front-wheel drive, and 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. In 1997 it was phased out and replaced by the transversely-mounted Alfa Romeo [Twin Spark engine#16-valve Twin Spark engines|Twin Spark engines].

Description

This liquid-cooled, four cylinder, boxer 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. Wet sump lubrication.
The fuel delivery system depended on version: a single-barrel downdraft carburetor; one or two double-barrel downdraft carburetors; Bosch GmbH|Bosch] LE 3.1 Jetronic fuel injection.; or Bosch Motronic ML 4.1 fuel injection.

1200

The original engine displaced with an bore and stroke; it produces between.
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The engine was stroked up to to create the version. This engine produced. A version of this engine was fitted with a catalytic converter, air injection, and evaporative emissions controls and received Californian emissions certification in 1976. The Alfasud was nonetheless never exported to the United States.
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The was usually labelled a "1.3" in spite of its displacement. It produced with one or two double-barrel carburettors. It retained the bore but used the 1500s crankshaft.
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From 1978 until October 1986, the largest member of the family was the "1500" with bore and stroke. It was built until 1995 and produced. This is the largest engine to have been installed in Alfasuds.
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The produced. Bore and stroke is.
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In October 1986 the engine was increased in size to , it was used in the 33 and later Sprints, power was between. Bore and stroke is.
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In January 1990 a quad-cam 16-valve version of the venerable boxer was introduced; it was the most powerful to date, with with or without catalytic converters. Only available in fuel-injected form, the 1.7 16V was equipped with the Bosch Motronic ML 4.1 system.
The last Alfa Romeo flat-four engine was produced in 1997, after a run of 26 years.
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