Dante Giacosa Dante Giacosa (3 January 1905 – 31 March 1996) was an Italian automobile designer and engineer responsible for a range of Italian automobile designs — and for refining the front-wheel drive layout to an industry-standard configuration. He ...

, the Fiat 100 engine first appeared in a form in the all-new

Fiat 600 The Fiat 600 (, ) is a small, rear-engined city car and Economy car, economy family car made by Italian carmaker Fiat Automobiles, Fiat from 1955 to 1969 — offered in two-door fastback sedan and four-door Multipla mini MPV body styles. The 60 ...

in 1955. The in-line four-cylinder engine comprised an iron

block Block or blocked may refer to: Arts, entertainment and media Broadcasting * Block programming, the result of a programming strategy in broadcasting * W242BX, a radio station licensed to Greenville, South Carolina, United States known as ''96.3 ...

and an aluminium

cylinder head In a piston engine, the cylinder head sits above the cylinders, forming the roof of the combustion chamber. In sidevalve engines the head is a simple plate of metal containing the spark plugs and possibly heat dissipation fins. In more modern ...

with

pushrod A valvetrain is a mechanical system that controls the operation of the intake and exhaust valves in an internal combustion engine. The intake valves control the flow of air/fuel mixture (or air alone for direct-injected engines) into the combu ...

actuated valves. The engine was produced at Fiat's Mirafiori (

Turin Turin ( , ; ; , then ) is a city and an important business and cultural centre in northern Italy. It is the capital city of Piedmont and of the Metropolitan City of Turin, and was the first Italian capital from 1861 to 1865. The city is main ...

) plant, and then at

Bielsko-Biała Bielsko-Biała (; ; , ; ) is a city in southern Poland, with a population of approximately 166,765 as of December 2022, making it the List of cities and towns in Poland#Largest cities and towns by population, 22nd largest city in Poland, and an a ...

, and remained in production until 2000, used in

Fiat Panda The Fiat Panda is a city car manufactured and marketed by Fiat Automobiles, Fiat since 1980, currently in its third generation. The first generation Panda, introduced in 1980 as the Mk1, was a Car body configurations#Two-box design, two-box, thr ...

and

Fiat Seicento The Fiat Seicento (Type 187) is a city car produced by the Italy, Italian company Fiat, introduced at the end of 1997 as a replacement for the Fiat Cinquecento, although it was also based on the Cinquecento. The Seicento did not differ much fro ...

in its last capacity version fitted with SPI

single-point injection Manifold injection is a mixture formation system for internal combustion engines with external mixture formation. It is commonly used in engines with spark ignition that use petrol as fuel, such as the Otto engine, and the Wankel engine. In a manif ...

and

hydraulic tappet A hydraulic tappet, also known as a hydraulic valve lifter or hydraulic lash adjuster, is a device for maintaining zero valve clearance in an internal combustion engine. Conventional solid valve lifters require regular adjusting to maintain a ...

s, although slowly being phased out starting from 1985 in favour of the new

Fiat FIRE Fiat Automobiles S.p.A., commonly known as simply Fiat ( , ; ), is an Italian automobile manufacturer. It became a part of Fiat Chrysler Automobiles in 2014 and, in 2021, became a subsidiary of Stellantis through its Italian division, Stellant ...

engine. It was also produced until 2008 in the 21. maj DMB plant for Zastava.

Engine specifications

The 100-series engine has a three main bearing

crankshaft A crankshaft is a mechanical component used in a reciprocating engine, piston engine to convert the reciprocating motion into rotational motion. The crankshaft is a rotating Shaft (mechanical engineering), shaft containing one or more crankpins, ...

, a cast iron block and an aluminium cylinder head with an integrated

intake manifold An inlet manifold or intake manifold (in American English) is the part of an internal combustion engine that supplies the fuel/air mixture to the cylinder (engine), cylinders. The word ''manifold (engineering), manifold'' comes from the Old Eng ...

. The

camshaft A camshaft is a shaft that contains a row of pointed cams in order to convert rotational motion to reciprocating motion. Camshafts are used in piston engines (to operate the intake and exhaust valves), mechanically controlled ignition syst ...

was placed in the block and was

chain drive Chain drive is a way of transmitting mechanical power from one place to another. It is often used to convey power to the wheels of a vehicle, particularly bicycles and motorcycles. It is also used in a wide variety of machines besides vehicles. ...

n. There were 2 overhead valves per cylinder, actuated by an

OHV OHV may refer to: * Overhead valve engine * Off-highway vehicle, aka off-road vehicle * Off-roading * California State Parks California State Parks is the state park system for the U.S. state of California. The system is administered by the C ...

valvetrain. Early versions were fed by a

carburettor A carburetor (also spelled carburettor or carburetter) is a device used by a gasoline internal combustion engine to control and mix air and fuel entering the engine. The primary method of adding fuel to the intake air is through the Vent ...

, but single point

fuel injection Fuel injection is the introduction of fuel in an internal combustion engine, most commonly automotive engines, by the means of a fuel injector. This article focuses on fuel injection in reciprocating piston and Wankel rotary engines. All c ...

with

catalyst Catalysis () is the increase in rate of a chemical reaction due to an added substance known as a catalyst (). Catalysts are not consumed by the reaction and remain unchanged after it. If the reaction is rapid and the catalyst recycles quick ...

would appear in the early '90s to fulfill anti-pollution laws, along with electronic Distributorless Ignition System.

Applications

List of vehicles utilising variations of the Fiat 100-series engine. * Fiat/SEAT 600 (1955) *

Fiat 600 Multipla The Fiat 600 (, ) is a small, rear-engined city car and Economy car, economy family car made by Italian carmaker Fiat Automobiles, Fiat from 1955 to 1969 — offered in two-door fastback sedan and four-door Multipla mini MPV body styles. The 60 ...

(1955) *

Abarth 750/850/1000 (1957) *

SEAT 800 The SEAT 600 is a city car made in Spain by SEAT from 27 May 1957 to 3 August 1973, built under license from Fiat on the original Italian Fiat 600, designed by Dante Giacosa. It was offered in two-door Sedan (automobile), saloon body style rear en ...

(1964) *

Fiat 850 The Fiat 850 (''Tipo 100G'') is a small rear-engine, rear-wheel-drive layout, rear-engine, rear-wheel-drive car manufactured and marketed by Italian car manufacturer Fiat from 1964 to 1973. History Overview Its technical design was an evolution o ...

1964 * Fiat 850 Coupé and Spider (1965) * Fiat 850T (1965) * Fiat 770 Coupé Vignale (1968) * Fiat 850 Special (1968) * Fiat 850 Sport Coupé and Sport Spider (1968) *

Autobianchi A112 The Autobianchi A112 is a supermini car, supermini produced by the Italy, Italian automaker Autobianchi. It was developed using a shrunken version of the contemporary Fiat 128's platform. The mechanicals of the A112 subsequently underpinned the Fi ...

(1969) * Fiat/SEAT 127 (1971) * Fiat/SEAT 133 (1974) *

Fiat 900T The Fiat 900T was a small van produced by the Italian automobile manufacturer Fiat Automobiles, Fiat between 1976 and 1985, replacing the similar Fiat 850, Fiat 850T. It was first presented in November 1976, at the Turin Motor Show, Turin Show. In ...

(1976) *

Fiat Uno The Fiat Uno is a supermini manufactured and marketed by Fiat. Launched in 1983, the Uno was produced over a single generation (with an intermediate facelift, 1989) in three and five-door hatchback body styles until 1995 in Europe — and un ...

45 (1983) * Fiat/SEAT Panda 45 (1980) *

Seat Marbella The SEAT Marbella (codenamed ''141A'') was a badge-engineered Fiat Panda produced by SEAT from 1980 to 1986 (initially called the SEAT Panda), in the company's Landaben plant in the Spanish city of Pamplona (from February 1980 until 29 April 1983, ...

(1988) * Seat Trans/Terra (1986) *

Seat Ibiza The SEAT Ibiza is a supermini car that has been manufactured by Spanish car manufacturer SEAT since 1984. It is SEAT's best-selling car. The Ibiza is named after the Spanish island of Ibiza and was the second SEAT model to be named after a Span ...

Junior (1986) *

Fiat Fiorino The Fiat Fiorino is a small commercial vehicle produced by the Italian car manufacturer Fiat since 1977. Its first two generations have been the panel van derivatives of other small models, such as the Fiat 127 and Fiat Uno, while the current th ...

(1977) *

Fiat Cinquecento The Fiat Cinquecento (Type 170) (, ) is a front engine front-wheel-drive, four passenger, three door hatchback city car manufactured and marketed by Fiat from 1991 to 1998 over a single generation. It was manufactured at Fabryka Samochodów Ma� ...

(1992) *

(1998) (1962 - 2012) *Zastava 600 (1961) *

Zastava 750 The Zastava 750 (Застава 750) is a supermini made by the Yugoslav car maker Zavod Crvena Zastava in Kragujevac. It was a version of the Fiat 600 made under licence from 1962 and was somewhat longer than the Fiat version. The Zastava 750 ...

(1962 - 1985) * Zastava Yugo/Yugo Koral (1978-2008) {{commons category, Fiat 100 engine

SOHC An overhead camshaft (OHC) engine is a piston engine in which the camshaft is located in the cylinder head above the combustion chamber. This contrasts with earlier overhead valve engines (OHV), where the camshaft is located below the combus ...

Straight-four engines Gasoline engines by model