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 and a stroke of 73 mm × 71.5 mm (2.87 in × 2.81 in) to produce a displacement of 1.2 L (1,197 cc). A larger 1.4 L (1,438 cc) version arrived in October 1968, in the 124 Special. This has an 80 mm (3.15 in) bore. [1] The bore was increased to 76 mm (2.99 in) to give a displacement of 1.3 L (1,297 cc) for the 131, which was also available in a 1.6-litre version with a 84 mm (3.31 in) bore. A variety of other bores and strokes were available. Several of the Brazilian Fiasa engines share their bore and stroke with the 124 series engines and were sometimes used in the same cars, but the engines are not related.
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, a cast iron block and a reverse-flow aluminum alloy head. Intake and exhaust are both located on the right-hand side of the engine.
There are also overhead camshaft versions of the 124-series engine. The first was the Fiat Twin Cam, which used the 124-series block with some modifications to use a DOHC valvetrain with a crossflow head. The Italian single overhead cam version arrived in 1981 and formed the basis for the three diesel versions.
The 1.4 L (1,367 cc) diesel was available in turbocharged guise in the Uno Turbo D, while the larger 1.9-litre version was also available with direct injection.
There was also a two-litre pushrod version (6132 AZ 2000) for the 1974 to 1982 Fiat Nuova Campagnola; this has the 84 mm (3.31 in) bore of the 1.6 but combined with a 90 mm (3.54 in) stroke. [2]
Valid engine bore/stroke combinationsStroke
(mm) | Bore (mm) |
|---|
| 73 | 76 | 76.1 | 78 | 80 | 82.6 | 84 |
|---|
| 71.5 | 1197
OHV | 1297
OHV | 1301
OHV | 1367
SOHC,
diesel | 1438
OHV | 1533 | 1585
OHV,
SOHC |
|---|
| 79.2 | 1326 | 1437 | 1441 | 1514 | 1592 | 1697
diesel | 1756 |
|---|
| 90 | 1507 | 1633 | 1637 | 1720 | 1810 | 1929
diesel | 1995
OHV |
|---|
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