http://en.wikipedia.org/wiki/Mazda_B_engine#B8
B8
The 1.8 L (1839 cc) B8 is not just a bored and stroked B6. Rather, a new block with widened cylinder spacing is used. The bore was 83 mm and the stroke was 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).
BP
The 1.8 L (1839 cc) 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, an aluminum baffled oil pan and is the first engine to feature Mazdas patented VICS (Variable Induction Control System) system. 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)
-1990-1994 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
-1994-1997 Kia Sephia GS
-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, bigger fuel injectors and stronger engine internals helping to up the performance of the engine to produce 206 hp (154 kW) and 184 ft·lbf (250 N·m). 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 Cam Angle Sensor with a magnetic unit at the front and has an improved intake system. 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.
Applications:
-1998-2000 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, now replaced with the Variable Tumble Control System (VTCS), a similar torque enhancing set of partial butterflys that increases velocity. 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 201 hp (150 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)
