The Mazda B engine family is a four cylinder SOHC and DOHC engine family ranging from 1.1 L to 1.8 L. It was designed for front-wheel drive economy car applications but was later modified for the turbocharged full-time 4WD 323 GTX and rear-wheel drive Miata as well as numerous other models. Unusually for a (relatively) modern engine, the B-series is "non-interference", 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.