| Manufacturer | Mazda |
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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.
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B1
1,138 cc (1.138 L; 69.4 cu in) B1 - (68x78.4 mm) - came only as a SOHC 8-valve. It was available in the 1987-1989 Mazda 121 and later model Kia Pride in European and Asian markets. A fuel injected variant was used in select European market 1991-1995 Mazda 121s
B3
1,324 cc (1.324 L; 80.8 cu in) B3 - (71x83.6 mm). It was available in SOHC and DOHC variants and was found in the Kia-built 1988-1993 Ford Festiva, the 1987-1989 Mazda Familia,and the 1984-1986 Mazda 323,and the 1991-1998 Mazda 121 (also known as Autozam Revue) (54hp and 72hp version), and the 1987-1989 Ford Laser, and 1994-1997 Ford Aspire. Later variants were used in the Mazda Demio microcar as late as 1999.
Horsepower: Fuel injected63 hp (47 kW) @ 5000 rpm Torque: 73 ft·lbf (99 N·m) @ 3000 rpm Carburated58 hp (43 kW)
B5
1,498 cc (1.498 L; 91.4 cu in) B5 - (78x78.4 mm) - The SOHC B5 upped the displacement to 1.5 L and was found in the rear-wheel drive 1977 Familia/GLC, the 1987-1989 Mazda Familia and the 1987-1989 Ford Laser. Later variants were used in the Kia Sportage, Sephia and Mazda Demio microcar as late as 1999 .
B5 DOHC
1,498 cc (1.498 L; 91.4 cu in) B5 - (78x78.4 mm) - A Japanese-only variant of the B5 with fuel injection and revised head/intake system. Found in the 1989-1994 Mazda Familia Interplay and Ford Laser S. Power output 81 kW (110 PS) at 6500 rpm and 12.9 kgf·m (127 N·m) at 5500 rpm. Timor s-515i use B5 with 110 PS at 5500 rpm and 145 Nm at 4400 rpm non Variable Valve spec 9.2:1 compression ratio. The B5 DOHC was also found in the Autozam AZ-3, a Japanese market version of the Mazda MX-3. This 1.5l engine & ECU setup produced 117 bhp (87 kW).
- According to http://english.auto.vl.ru/catalog/mazda/familia/1994_6/14895/ the 94 interplay versions has the B5-ZE engine which produces 125 ps (91.94 kW) / 7000 rpm and 13.2 kg*m (129.45 N*m) / 6000 rpm
B6
1,597 cc (1.597 L; 97.5 cu in) B6 — (78x83.6 mm) — This was a bored-out version of the B3. The 8-valve SOHC B6 was found in the 1985-1989 Mazda 323, the 1988-1990 Mercury Tracer, and the 1990-1994 Mazda 323, and the 1992 Mazda MX-3. The B6 was also found in the 1993-1998 kia sephia and produced 82 hp (61 kW).
In Japan and Australia a fuel-injected version called the B6F was available.
B6-2E
1,597 cc (1.597 L; 97.5 cu in) B6-2E - (78x83.6 mm), also known as B6-ME - This was a variant of the B6-E with a 16-valve cylinder head. It is found in the 1991-1994 Mercury Capri, 1992-1994 California-spec Mazda 323 and 1992-1993 Mazda MX-3. The B6-ME produced 88 hp (66 kW) and 96 ft·lbf (130 N·m).
B6T
1,597 cc (1.597 L; 97.5 cu in) B6T - (78x83.6 mm) - The ubiquitous turbocharged, fuel-injected and intercooled 16-valve DOHC B6, released in 1985 and used in numerous models worldwide including the 323 GT-X, 1985-1989 Mazda Familia GT-X/GT, 1985-1989 Ford Laser TX3 turbo, and later Mercury Capri's. This engine was most commonly found mated to a 4WD drivetrain although FWD models were also available in the capri XR2 & 323 GT.
Power and torque outputs varied across markets due to emission and fuel standards.
The B6T available in north america came with 132 HP & 136 ft-lbs
The Japanese version of the B6T was the most powerful, producing 147 hp (110 kW) and 137 ft·lbf (186 N·m) due to better intake manifold & ecu tuning for better gasoline 95 octane
B6D
1,597 cc (1.597 L; 97.5 cu in) B6D - (78x83.6 mm) - The same strengthened and fuel-injected 16-valve DOHC B6 but with higher compression, no turbo, and the first Mazda engine to feature VICS (Variable Inertia Charge System). Most commonly found in the 1985-1988 Japanese market Familias, Etudes and Lasers, this engine was updated in 1989 with revised compression, heads and intake system (in a similar vein to the B5 DOHC) for the 1989-1991 Familia and Laser, then further refined for the 1991-1994 Mercury Capri and 1994-1996 2nd Generation Mazda MX-3 RS. The third generation B6D features an alloy cam cover, a VLIM (VICS) intake, had a 9:1 compression ratio and produced 107 hp (79 kW).
B6ZE(RS)
1,597 cc (1.597 L; 97.5 cu in) 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 7200 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).
B8
The 1,839 cc (1.839 L; 112.2 cu in) B8 is not just a bored and stroked B6. Rather, a new block with widened cylinder spacing. The bore is 83 mm and the stroke is 85 mm. This SOHC engine was used in various Australian Mazda 323s and the American 1990-1994 Mazda Protege. It came in both 8 (B8-E) and 16-valve variants (B8-ME).
The B8ME is also found in Canadian variants of the 323 hatchback.
BP
The 1,839 cc (1.839 L; 112.2 cu in) BP is a dual-overhead variant of the B8. It was first found in the 1989 Mazda Familia and American-market 1990 Mazda Protege LX. This engine was dubbed BP-ZE and featured a forged crankshaft, piston oil squirters, a structural aluminum oil pan with cooling fins, and Variable Inertia Charging System (VICS). This particular variant can be found in the following vehicles:
- 1989-1994 Mazda Familia GT (European & Australian Market)
- 1989-1994 Ford Laser TX3 (Australian Market)
- 1990-1994 Mazda Protege LX (with VICS)
- 1990-1991 and 1993 Mazda Protege GT (Canadian Market)
- 1990-1993 Mazda 323 (European Market)
- 1992-1993 Ford Escort LX-E
- 1991-1996 Ford Escort GT
- 1991-1996 Mercury Tracer LTS
- 1995-1997 Kia Sephia LS, GS
- 1995-1997 Kia Sephia RS
- 1994-1998 Mazda Familia (Japanese Market)
- 1994-1997 Mazda MX-5/Miata (this did not have VICS until 1999)
There is also a non-performance version that is most easily recognized by its black stamped-steel oil pan. It also features a cast crankshaft, no oil squirters, a plastic oil pickup tube and less aggressive camshafts. It is found in the 1995-1998 Mazda Protege ES.
BPT
The BPT is a turbocharged and intercooled variant of the BP. It produced 179 hp (134 kW) and 174 ft·lbf (237 N·m) of torque.
The most powerful version was named the BPD. It is commonly known as the 'big turbo' variant as it utilised a much larger IHI RHF6CB turbocharger. The BPT was used as the basis for the engine, with changes such as sodium filled exhaust valves, larger (and front mounted) intercooler, larger high impedance fuel injectors and stronger engine internals helping to up the performance of the engine to produce 209 hp (156 kW) and 184 ft·lbf (255 N·m).The VICS system of the N/A BP has been removed. This engine was designed to power Mazda to a world rally championship win, and was thus used in the limited production Mazda Familia GT-R (2200 built) and GTAe (300 built).
Applications:
- 1989-1994 Mazda Familia GT-X (Japan)
- 1992-1993 (BPD) Mazda Familia GT-R / GTAe (Japan)
- 1989-1994 Ford Laser TX3 turbo (Australia)
- Ford Laser GT-X
BP-4W
The 1999 Miata uses a modified BP, the BP-4W, which replaces the old Hall Effect dual Cam Angle Sensor unit mounted at the back of the exhaust cam with two separate Hall Effect units at the front - one on the intake cam gear and one mounted on the oil pump, to the side of the crankshaft pulley. It also has an improved intake system (a better flowing cylinder head because of the angle of the intake ports being changed). The United States 2004-2005 Mazdaspeed MX-5 turbo is based on this engine rather than the newer BP-Z3 and produces 178 hp (133 kW) and 166 ft·lbf (225 N·m) with slightly-reduced compression. The Mazdaspeed turbo engine has no VICS, but does have VTCS which is often considered related, but is not.
Applications:
- 1999-2000 Mazda MX-5/Miata
- 2004-2005 Mazdaspeed MX-5 (turbo)
BP-Z3
In 2001, Mazda introduced the BP-Z3 (also called BP-VE) variant of the BP engine with S-VT variable valve timing on the intake side, no more VICS, but there is Variable Tumble Control System (VTCS)in the BP-Z3. A similar looking but effectively very different set of valves that restrict the intake on cold start for emissions purposes, rather than the torque enhancing set of partial butterflies that increase velocity that are used in VICS. This was found in the 2001+ Miata. The Z family is an evolution of this engine.
In Australia, a turbocharged version of this engine produced 210 hp (157 kW) and 206 ft·lbf (280 N·m) in the Mazda MX-5 SP. The United States 2004-2005 Mazdaspeed MX-5 turbo is a BP-4W, not a BP-Z3.
Applications:
- 2001-2005 Mazda MX-5/Miata
- Mazda MX-5 SP (Australian turbo)
See also
External links
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