The ironhead was a Harley-Davidson

Harley-Davidson

Harley-Davidson , often abbreviated H-D or Harley, is an American motorcycle manufacturer. Founded in Milwaukee, Wisconsin, during the first decade of the 20th century, it was one of two major American motorcycle manufacturers to survive the Great Depression...

 motorcycle

Motorcycle

A motorcycle is a single-track, two-wheeled motor vehicle. Motorcycles vary considerably depending on the task for which they are designed, such as long distance travel, navigating congested urban traffic, cruising, sport and racing, or off-road conditions.Motorcycles are one of the most...

 engine

Engine

An engine or motor is a machine designed to convert energy into useful mechanical motion. Heat engines, including internal combustion engines and external combustion engines burn a fuel to create heat which is then used to create motion...

, so named because of the composition of the cylinder heads. The engine is a two cylinder, two valves per cylinder, pushrod V-twin

V-twin

A V-twin engine is a two-cylinder internal combustion engine where the cylinders are arranged in a V configuration.- Crankshaft configuration :Most V-twin engines have a single crankpin, which is shared by both connecting rods...

. It was produced from 1957 until 1985 and was replaced by the Evolution engine

Evolution engine

The Evolution engine is an air-cooled, 45-degree, V-twin engine manufactured since 1984 by the Harley Davidson Motor Company for the company's motorcycles. It was made in the displacement for Harley Davidson Big V-twins bikes, replacing the Shovelhead engine, until 1999 when it was replaced by...

 1986.

This name may also be applied to the Harley-Davidson Sportster motorcycles that used this engine.

External links

• Images of each style of Harley-Davidson engine