| Fiat 100 engine | |
| Manufacturer: | Fiat |
| Production: | 1955–2008 |
| Configuration: | Inline-4 |
| Valvetrain: | OHV 2 valves x cyl. |
| Successor: | Fiat FIRE |
| Displacement: | NaNcc |
| Power: | NaNPS |
| Block: | cast iron |
| Head: | aluminium |
| Fueltype: | Gasoline |
| Fuelsystem: | Carburettor Single-point injection |
| Coolingsystem: | Water-cooled |
| Emissions Control: | Catalytic converter (since early '90s) |
Designed by Dante Giacosa, the Fiat 100 engine first appeared in a 633cc form in the all-new Fiat 600 in 1955. The in-line four-cylinder engine comprised an iron block and an aluminium cylinder head with pushrod actuated valves. The engine was produced at Fiat's Mirafiori (Turin) plant, and then at Bielsko-Biała, and remained in production until 2000, used in Fiat Panda and Fiat Seicento in its last 899cc capacity version fitted with SPI single-point injection and hydraulic tappets, although slowly being phased out starting from 1985 in favour of the new Fiat FIRE engine.
It was also produced until 2008 in the 21. maj DMB plant for Zastava.
The 100-series engine has a three main bearing crankshaft, a cast iron block and an aluminium cylinder head with an integrated intake manifold. The camshaft was placed in the block and was chain driven. There were 2 overhead valves per cylinder, actuated by an OHV valvetrain. Early versions were fed by a carburettor, but single point fuel injection with catalyst would appear in the early '90s to fulfill anti-pollution laws, along with electronic Distributorless Ignition System.
List of vehicles utilising variations of the Fiat 100-series engine.
(1962 - 2012)