Fiat 124 series engine

Fiat 124/OHV engine

131 A1.000 engine (OHV 1,585 cc)
Overview
Manufacturer Fiat / Fiat Automóveis (Brazil)
Production 1966–199?
Combustion chamber
Configuration OHV 2-valve inline-four
SOHC 2-valve inline-four
SOHC diesel 2-valve inline-four
Displacement 994–1,585 cc
Cylinder block alloy cast iron
Cylinder head alloy aluminium

Designed by Aurelio Lampredi, the Fiat 124 engine first appeared in the all-new Fiat 124 in April 1966. The in-line four-cylinder engine comprised an iron block with an aluminium cylinder-head with pushrod actuated valves. The belt-driven design was ahead of its time when introduced. The engine remained in production until the 1990s in Latin America, although European production ended with the Fiat 131 in 1984. It did have a longer life in its twin-cam iteration, which continued in production until 2000. While originally of an overhead valve design, an overhead cam version was developed for Fiat's Brazilian arm in 1976 and in 1981 it was added to the facelifted 131 in Europe as well. The capacity was initially 1,197 cc (in the Fiat 124), but eventually ranged between 994 cc and 1,585 cc. There was also a 1.3 liter diesel iteration, only built in Brazil but exported to Europe as well. The last versions of this engine to be built was the one-liter engine developed in Brasil for the Fiat Mille.

Engine specifications

The Fiat 124 series engine was produced in a number of configurations differing in stroke and bore but maintaining a standard bore-spacing. The first model (124 A.000) was near square, using a bore of 73.0 mm and a stroke of 71.5 mm to produce a displacement of 1197 cc. A larger 1438 cc version arrived in October 1968, in the 124 Special. This has an 80 mm bore.[1] The bore was increased to 76 mm to give a displacement of 1,297 cc for the 131, which was also available in a 1.6 liter version (84 mm bore). A variety of other bores were available, and the Brazilian engine was later also developed with both short and long-stroke versions of 994 and 1497 cc respectively.

The 1.3 was later bored out by 0.1 mm, to nudge the displacement above 1.3 liters. This allowed Italian motorists to drive a full 140 km/h (87 mph) on the autostrada, rather than the 130 km/h (81 mph) which was allowed for cars under 1.3 litres.

The 124-series engine has five main bearings, an iron block and an alloy head. Intake and exhaust are both located on the right-hand side of the engine. The Brazilian engine was the first overhead cam version developed, first shown in autumn of 1976. It took nearly five years before the Italian-built engines were changed to such a design. The Brazilian engine, which first appeared in a 1.05 litre version, has chrome-treated exhaust valves with stellite seats, for increased durability.[2] It also received breakerless ignition (electronic) and the camshaft is driven by a toothed belt.[3]

The Brazilian engines were also exported to Europe in large numbers, both for the 127, Ritmo, and the later Uno as well as a few Milles/Dunas/Elbas sold by Innocenti. The 1.05 was also installed in the Autobianchi Y10, where it was also available with turbocharging.[4]

The diesel, originally of 1301 cc, was later bored out to 78 mm (for a total displacement of 1367 cc) and was also available turbocharged. There was also a two-litre pushrod version (6132 AZ 2000) for the 1974 to 1982 Fiat Nuova Campagnola, this has the 84 mm bore of the 1.6 but combined with a 90 mm stroke.[5]

Valid engine bore/stroke combinations
Stroke
(mm)		 Bore (mm)  
73 76 76.1 78 80 84
54.8 (SOHC) 917 994 997 1047 1102 1215 Capacity
(cc)
57.8 (SOHC) 968 1049 1052 1105 1162 1281
71.5 (OHV) 1197 1297 1301 1367 1438 1585
71.5 (SOHC) 1049 1297 1301 1367 1438 1585
82.5 (SOHC) 1381 1497 1501 1577 1659 1829
71.5 (Diesel) 1197 1297 1301 1367 1438 1585
Key
Italy  
Brazil  

Applications

List of vehicles utilising variations of the Fiat 124-series engine (incomplete).

Fiat

OHV
SOHC
"Brazil" engine
Diesel engine

Lancia/Autobianchi

"Brazil" engine

SEAT

OHV

Footnotes

  1. ↑ Braunschweig, Robert; et al., eds. (March 11, 1971). "Automobil Revue '71" (in German and French). 66. Berne, Switzerland: Hallwag SA: 290.
  2. ↑ Quattroruote: Tutte le Auto del Mondo 77/78 (in Italian). Milano: Editoriale Domus S.p.A. 1977. pp. 182–183.
  3. ↑ Casucci, Piero (1993), "Lancia Y10", La Collection, Milan, Italy: Automobilia: Società per la Storia e l'Immagine dell'Automobile, p. 28, ISBN 978-88-7960-005-7
  4. ↑ Bernardet, Alain (April 1985). "Salon de Genève" [The Geneva Show]. Echappement (in French). Paris, France: Michael Hommell (198): 47.
  5. ↑ Büschi, Hans-Ulrich, ed. (March 3, 1982). "Automobil Revue '82" (in German and French). 77. Berne, Switzerland: Hallwag, AG: 572. ISBN 3-444-06062-9.
  6. ↑ Schruf, Werner (1970). "Scharfe Zwillinge" [Sharp twins]. Auto Motor und Sport (in German) (22): 117.
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