Mazda B engine

Mazda B engine
Mazda B engine
Overview
Manufacturer	Mazda
Production	1985–2005
Layout
Configuration	Inline-four engine
Displacement	1,138 cc (69.4 cu in); 1,290 cc (79 cu in); 1,324 cc (80.8 cu in); 1,498 cc (91.4 cu in); 1,597 cc (97.5 cu in); 1,839 cc (112.2 cu in); 1,995 cc (121.7 cu in);
Cylinder bore	68.0 mm (2.68 in); 71.0 mm (2.80 in); 78.0 mm (3.07 in); 83.0 mm (3.27 in);
Piston stroke	67.5 mm (2.66 in); 78.4 mm (3.09 in); 83.6 mm (3.29 in); 85.0 mm (3.35 in); 90 mm (3.5 in);
Cylinder block material	Cast iron
Cylinder head material	Aluminum
Valvetrain	SOHC; DOHC;
Combustion
Fuel type	Gasoline
Oil system	Wet sump
Cooling system	Water-cooled
Chronology
Successor	Mazda Z engine; Mazda L engine;

The Mazda B-series is a small-sized, iron-block, inline four-cylinder engine with belt-driven SOHC and DOHC valvetrain ranging in displacement from 1.1 to 1.8 litres. It was used in a wide variety of applications, from front-wheel drive economy vehicles to the turbocharged full-time 4WD 323 GTX and rear-wheel drive Miata.

The B-series is a "non-interference" design, meaning that breakage of its timing belt does not result in damage to valves or pistons, because the opening of the valves, the depth of the combustion chamber and (in some variants) the shaping of the piston crown allow sufficient clearance for the open valves in any possible piston position.