The Fiat 509 was a model of car produced by Italian

Italy

Italy , officially the Italian Republic languages]] under the European Charter for Regional or Minority Languages. In each of these, Italy's official name is as follows:;;;;;;;;), is a unitary parliamentary republic in South-Central Europe. To the north it borders France, Switzerland, Austria and...

 automotive manufacturer Fiat

Fiat

FIAT, an acronym for Fabbrica Italiana Automobili Torino , is an Italian automobile manufacturer, engine manufacturer, financial, and industrial group based in Turin in the Italian region of Piedmont. Fiat was founded in 1899 by a group of investors including Giovanni Agnelli...

 between 1925 and 1929 as a replacement for the 501

Fiat 501

The Fiat 501 is a car produced by Fiat between 1919 and 1926. The 501 was Fiat's first model after World War I. In 1921came sport versions S and SS. Fiat produced 47,600 examples.- Engines :-References:...

. Approximately 90,000 of the model were sold. In 1926 the car was upgraded to the 509A. For 1928, the 509 was offered with standard insurance, also.

In addition to as the standard car, there were 509S and 509SM sports models, as well as and taxi and commercial versions.

Engines

The Fiat 509 was fitted with a 990 cc overhead cam

Overhead camshaft

Overhead cam valvetrain configurations place the engine camshaft within the cylinder heads, above the combustion chambers, and drive the valves or lifters in a more direct manner compared to overhead valves and pushrods...

 engine.

Model	Years	Engine	Displacement	Power	Fuel system
509	1924-29	straight-4 Straight-4 The inline-four engine or straight-four engine is an internal combustion engine with all four cylinders mounted in a straight line, or plane along the crankcase. The single bank of cylinders may be oriented in either a vertical or an inclined plane with all the pistons driving a common crankshaft....  SOHC	990 cc	22 hp	single carburetor Carburetor A carburetor , carburettor, or carburetter is a device that blends air and fuel for an internal combustion engine. It is sometimes shortened to carb in North America and the United Kingdom....
509 S	1925-29	straight-4 Straight-4 The inline-four engine or straight-four engine is an internal combustion engine with all four cylinders mounted in a straight line, or plane along the crankcase. The single bank of cylinders may be oriented in either a vertical or an inclined plane with all the pistons driving a common crankshaft....  SOHC	990 cc	27 hp	single carburetor Carburetor A carburetor , carburettor, or carburetter is a device that blends air and fuel for an internal combustion engine. It is sometimes shortened to carb in North America and the United Kingdom....
509 SM	1925-29	straight-4 Straight-4 The inline-four engine or straight-four engine is an internal combustion engine with all four cylinders mounted in a straight line, or plane along the crankcase. The single bank of cylinders may be oriented in either a vertical or an inclined plane with all the pistons driving a common crankshaft....  SOHC	990 cc	30 hp	single carburetor Carburetor A carburetor , carburettor, or carburetter is a device that blends air and fuel for an internal combustion engine. It is sometimes shortened to carb in North America and the United Kingdom....