Volkswagen air-cooled engine

Volkswagen Boxer Engine
Volkswagen Boxer Engine
Overview
Manufacturer	Volkswagen
Production	1936–2006
Layout
Configuration	Flat-4 naturally aspirated petrol engine
Displacement	1.0 L (985 cc); 1.1 L (1,131 cc); 1.2 L (1,192 cc); 1.3 L (1,285 cc); 1.5 L (1,493 cc); 1.6 L (1,584 cc); 1.7 L (1,679 cc); 1.8 L (1,795 cc); 2.0 L (1,971 cc);
Cylinder bore	70 mm (2.76 in); 75 mm (2.95 in); 77 mm (3.03 in); 83 mm (3.27 in); 85.5 mm (3.37 in); 90 mm (3.54 in); 93 mm (3.66 in); 94 mm (3.70 in);
Piston stroke	64 mm (2.52 in); 69 mm (2.72 in)66 mm (2.60 in); 71 mm (2.80 in);
Chronology
Successor	Volkswagen Wasserboxer engine

The Volkswagen air-cooled engine is an air-cooled, gasoline-fuelled, boxer engine with four horizontally opposed cast-iron cylinders, cast aluminum alloy cylinder heads and pistons, magnesium-alloy crankcase, and forged steel crankshaft and connecting rods.

There are two distinct families/variations of the aircooled engine namely Type 1 and Type 4. The Type 3 engine is a variation of the Type 1 engine with pancake cooling arrangement.

Variations of the engine were produced by Volkswagen plants worldwide from 1936 until 2006 for use in Volkswagen's own vehicles, notably the Type 1 (Beetle), Type 2 (transporter), Type 3, and Type 4. Additionally, the engines were widely used in industrial, light aircraft and kit car applications.