Mazda B Series Engine

by MrFamilia Fri Sep 23, 2011 6:56 am

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

B5 Engine

16-valve DOHC

1.5 L (1,498 cc) B5D - (78.0x78.4 mm) - A Japanese-only variant of the B5 with fuel injection and revised head/intake system. Found in the 1989-1994 BG Familia and Ford Laser S. Power output is 120 PS (88 kW) at 6,500 rpm and 13.5 kg·m (132 N·m; 98 lb·ft) at 5,500 rpm.[4] The Timor S515i also used a B5D, with 110 PS at 5,500 rpm and 145 Nm at 4,400 rpm without variable valve timing and with a 9.2:1 compression ratio. The B5D was also found in the Autozam AZ-3, a Japanese market version of the Mazda MX-3, where it produced 120 PS (88 kW).

Later Familia 'Interplay X' versions (1994 on) have a B5-ZE engine which produces 125 PS (92 kW) at 7,000 rpm and 13.2 kg·m (129 N·m; 95 lb·ft) at 6,000 rpm[12]

BP8-T

1.8 Turbo

The BPT is a turbocharged and intercooled variant of the BP. It produced 180 PS (132 kW) at 6,000 rpm and 24.2 kg·m (237 N·m; 175 lb·ft) of torque at 4,000 rpm in JDM-spec. 95 octane rated European models only claimed 166 PS (122 kW) at 5,500 rpm and 219 N·m (162 lb·ft) at 3,000 rpm.[4]

It featured an IHI RHB5 VJ20 turbocharger, sidemount intercooler, 330 cc blacktop injectors (high impedance). The standard BPT ecu had a boost cut at 14.7psi (calculated based on the air flow). The BPT versions of the Familia and Laser were only available in 4WD models, and featured an open front differential along with viscous LSD centre and rear differentials. This engine is rumoured to have been installed in some Mazda MX-5 Miata models.

B6ZE 1.6( Mazda mx5)

1.6 L (1,597 cc) B6ZE(RS) - (78x83.6 mm) - Developed for the Mazda Miata (1989–93). The engine uses a DOHC 16-valve alloy head with a lightened crankshaft and flywheel to allow a 7,200 rpm redline. An aluminum sump with cooling fins is an unusual feature of this engine. The Japanese version of the engine had a 9.4:1 compression ratio and produced 120 hp (90 kW) and 100 ft·lbf (136 N·m).