Fiat 100 series engine

Fiat 100 engine
Fiat 100GL.000 engine in a Fiat Cinquecento
Overview
Manufacturer	Fiat
Production	1955–2000
Combustion chamber
Configuration	OHV 2-valve inline-four
Displacement	633–1,050 cc
Cylinder block alloy	cast iron
Cylinder head alloy	aluminium

Designed by Dante Giacosa, the Fiat 100 engine first appeared in a 633 cc 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 his last 899 cc capacity version fitted with SPI fuel injection and hydraulic tappets, although it was being phased out from 1985 in favour of the new Fiat FIRE engine. It was also produced until 2008 in the Zastava plants in Kragujevac.

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. The first 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 distributorless electronic ignition.

List of vehicles utilising variations of the Fiat 100-series engine.