Alfa Romeo Flat-4 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 transversely-mounted Twin Spark engines.

Description

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; Bosch LE 3.1 Jetronic fuel injection (8 valve engines).; or Bosch Motronic ML 4.1 fuel injection (16 valve engines).

1200

The original engine displaced (72 cu.in.) with an bore and stroke and produced between .

Applications:
* 1971–1983 Alfa Romeo Alfasud
* 1984–1986 Alfa Romeo Arna
* 1984–1986 Nissan Cherry Europe (rebadged Alfa Romeo Arna, sold also as Nissan Pulsar Milano on the Japanese market)
* 1983–1986 Alfa Romeo 33 (late versions for export only)

1300

The engine was stroked up to to create the version. This engine produced . 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 Alfasud was nonetheless never exported to the United States.

Applications:
* 1977–1983 Alfa Romeo Alfasud
* 1977–1983 Alfa Romeo Sprint

1400

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.

Applications:
* 1978–1983 Alfa Romeo Alfasud
* 1978–1989 Alfa Romeo Sprint
* 1983–1995 Alfa Romeo 33
* 1994–1997 Alfa Romeo 145
* 1995–1997 Alfa Romeo 146

1500

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.Honest John
Alfa Romeo Alfasud and Sprint - Classic Car Review , Honest John
accessdate: 28. June 2018

Applications:
* 1978–1983 Alfa Romeo Alfasud
* 1978–1989 Alfa Romeo Sprint
* 1984–1986 Alfa Romeo Arna
* 1983–1995 Alfa Romeo 33
* 1985–1986 Clan Clover
* 1984–1986 Nissan Cherry Europe

1600

The produced . Bore and stroke is .''Tutte le Auto del Mondo 1992'', pp. 10–11

Applications:
* 1994–1997 Alfa Romeo 145
* 1995–1997 Alfa Romeo 146

1700

In October 1986 the engine was increased in size to (104 cu.in), it was used in the 33 and later Sprints, power was between . Bore and stroke is .

Applications:
* October 1986 – 1995 Alfa Romeo 33
* October 1986 – 1989 Alfa Romeo SprintQuattroruote.it
ALFA ROMEO Sprint 1.7 Quadrifoglio Verde - In commercio da 11/1987 a 11/1989 - Quattroruote.it
accessdate: 28. June 2018

1700 16V

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.

Applications:
* January 1990 – 1995 Alfa Romeo 33 (2nd generation)
* 1994–1997 Alfa Romeo 145
* 1995–1997 Alfa Romeo 146

References

{{DEFAULTSORT:Alfa Romeo Boxer engine
Boxer
Boxer engines
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