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Wikipedia / Mazda B 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.

1.1 liters

B1

B1 - (68.0x78.4mm) - came only as a SOHC 8-valve. It was available in the 1987–1989 Mazda 121 and later model Kia Sephia in European and Asian markets. A fuel-injected variant was used in select European market 1991–1995 Mazda 121s

1.3 liters

BJ

The BJ engine (78.0x67.5mm) was a DOHC 16-valve engine, used only in the Japanese market Ford Festiva GT, GT-X, and GT-A models (1986.10–1993.01, GT-A from March 1991). It generates at 7000rpm and is equipped with Mazda's "EGi" single-point fuel injection. It is a short-stroke version of the B5/B6 engines.

B3

B3 – (71.0×83.6mm). It was available in SOHC variants and was found in the Kia-built 1988–1993 Ford Festiva, the 1987–1989 Mazda Familia and its derivatives, as well as the Mazda 121 (also known as Autozam Revue) in versions, and the 1987–1989 Ford Laser, and 1994–1997 Ford Aspire. Later variants were used in the Mazda Demio subcompact until 2002.

Fuel Injected Engine: Horsepower: at 5000rpm Torque: at 3000rpm

Carbureted Engine: Horsepower:

Later versions (Mazda 323 91–98 etc.) produced at 5500rpm, and of torque at 3700rpm

1.5 liters

B5

8-valve SOHC

B5 - (78.0x78.4mm) - The SOHC 8-valve B5 upped the displacement to 1.5liters and was found in the 1987–1989 Mazda Familia and the 1987–1989 Ford Laser. It was also fitted to the Mazda Étude coupé and fifth-generation BF-series Familia Wagon, as it continued in production until 1994 along the new BG.

16-valve SOHC

There was also a 16-valve, SOHC B5-MI version of the B5, usually fitted with single-point fuel injection ("EGi"). This engine was mainly used in the Japanese domestic market. The B5-ME, equipped with electronic fuel injection, was used by Kia for several of their cars as well as in the Mazda Demio.

16-valve DOHC

B5D - (78.0x78.4mm) - 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 at 6,500rpm and at 5,500rpm. The Timor S515i also used a B5D, with at 5,500rpm and 145Nm at 4,400rpm 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 produces . The Kia Rio from 2000 to 2005 also has a B5 variant, but with a different bore/stroke ratio from all others (75.5mm bore, 83.4mm stroke, 1493cc total). This motor produced and .

  • Later Eunos Presso and Familia 'Interplay X' versions (1994 on) have a B5-ZE engine which produces at 7,000rpm and at 6,000rpm This was also installed in the Japanese market "Ford Laser"-badged versions of the Familia.

1.6 liters

B6

B6 — (78.0x83.6mm) — This was a bored-out version of the B3. The 16-valve SOHC B6 was found in the 1985–1989 and 1990–1994 Mazda 323, 1991–1993 Mazda MX-3 the 1987–1990 Mercury Tracer, and the 1985–1990 Ford Laser. The 16-valve DOHC B6 was also found in the 1994–1998 Ford Laser KJ/KL, 1997–2004 Kia Sephia, Kia Shuma, 2000–2004 Kia Spectra and 2000–2005 Kia Rio (for export markets).

In Japan, the United Kingdom, and Australia a fuel-injected version called the B6F was available. In Europe, the B6 also came in a 16-valve SOHC version, mostly found in the Mazda 323 BG and 323F BG models from 1989 to 1994. This engine was the same 1.6 liter fuel-injected and 88hp. Kia's version of the B6 (16-valve DOHC) had a marginally shorter stroke (at 83.4mm), for a total displacement of 1,594cc. This engine was used in the Rio, Sephia II, and Shuma.

  1. 8-valve SOHC

  2. 1985–1989 and 1990–1994 Mazda 323

  3. 1994–1996 Kia Sephia (for export markets only: DE, USA)

  4. 1987–1990 Mercury Tracer

  5. 1985–1990 Ford Laser KC/KE 323

  6. 16-valve SOHC

  7. 1991–1993 Mazda MX-3

  8. 1989–1994 Mazda 323 BG

  9. 1989–1994 Mazda 323F BG/Mazda Astina BG

  10. 1989–1994 Ford Laser KF/KH

  11. 16-valve DOHC

  12. 1989–1993 Mazda Miata

  13. 1993–1999 Mazda Xedos 6

  14. 2000–2005 Kia Rio (for export markets only)

  15. 1997–2003 Mazda Familia/ Mazda Etude (South Africa)

  16. 1991–1994 Mercury Capri (USDM)

B6-2E

B6-2E - (78.0x83.6mm), also known as B6-ME - This was a variant of the B6-E with a SOHC, 16-valve cylinder head.

B6T

B6T - (78.0x83.6mm) - The ubiquitous turbocharged, fuel-injected and intercooled 16-valve DOHC B6, released in 1985 and used in numerous models worldwide including the 1985–1989 Mazda Familia BFMR/BFMP (turbo), 1985–1989 Ford Laser TX3 turbo, and 1991–1994 Mercury Capri XR2. This engine was most commonly found mated to a 4WD drivetrain although FWD models were also available.

Power and torque outputs varied across markets due to emission and fuel standards. The B6T available in North America came with and . The Japanese version was slightly more powerful, producing and due to better intake manifold design and its ability to run 100 octane fuel. For the special rally homologation BFMR Familia GT-Ae model released in 1987, power and torque were raised to and respectively through the use of a slightly different turbocharger; engine internals remained otherwise identical.

B6D

B6D - (78.0x83.6mm) - The same strengthened and fuel-injected 16-valve DOHC B6 but with higher compression, no turbo, and the first Mazda engine to feature Variable Inertia Charge System (VICS). Most commonly found in the 1985–1988 Japanese market Familias, Études 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 to 1996, second 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 107hp (79kW).

===B6ZE(RS)=== B6ZE(RS) - (78x83.6mm) - Developed for the Mazda MX-5/Miata (1989–05) and Mazda Familia sedan GS/LS Full Time 4WD (JP only, 1994–1998). The engine uses a DOHC 16-valve alloy head with a lightened crankshaft and flywheel to allow a 7,200rpm redline. An aluminum sump with cooling fins is an unusual feature of this engine. The US and European version (1990–1993) had a 9.4:1 compression ratio and produced at 6,500rpm, and of torque at 5,500rpm. The later European version (1994–1997) produced at 6,500rpm, and at 5,500rpm. It was then updated to at 6,500rpm and at 5,000rpm for the models from 1998 to 2005. The Japanese version of the engine also had a 9.4:1 compression ratio and produced at 6,500rpm and at 5,500rpm. After 1998 the power was increased to at 6,500rpm and at 5,000rpm.

1.7 liter diesel

PN27

PN27 - (78x90mm) The PN27 is a 1720cc B6 based diesel motor used in the 1986–1989 Mazda Familia.

PN46

PN46 - (78x90mm) The PN46 is a 1720cc B6 based diesel motor used in the 1987–1989 Mazda Familia

1.8 liters

B8

The B8 (sometimes "BP") is not just a bored and stroked B6. Rather, it uses a new block with widened cylinder spacing. The bore is 83mm and the stroke is 85mm. This SOHC engine was used in various Australian Mazda 323s, the American 1990–1994 Mazda Protegé, and in Canadian variants of the 323 hatchback. It came with four valves per cylinder (B8-ME or BP-ME). It features hydraulic lash adjusters, a belt-driven cam, an 8.9:1 compression ratio, a 6,000rpm redline, and multi-port fuel injection. Power outputs are:

  • , 111lb-ft (U.S./Canadian market)

  • at 5,300rpm, at 4,000rpm (European markets)

BP

The BP, featuring a bore x stroke of , is a DOHC 4 valves per cylinder variant of the B8. This Inline-four engine was called BP-ZE by Mazda engineers and featured a forged crankshaft, piston oil squirters, a structural aluminium oil pan with cooling fins, a 7,000rpm redline, and Variable Inertia Charging System (VICS) which is activated by a control solenoid at high rpm to increase horsepower in the upper rev range. The engine in base form on 91 RON fuel produces at 6,000rpm and at 4,000rpm. The engine is a favourite for both N/A and turbo motoring enthusiasts for its robust design, materials and construction. This particular variant can be found in the following vehicles:

There is also a non-performance SOHC 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 at 6,000rpm and of torque at 4,000rpm in JDM-spec from G7+ CJ26 AH7 crankshaft. 95 octane rated European models only claimed at 5,500rpm and at 3,000rpm.

It featured an IHI RHB5 VJ20 turbocharger, sidemount intercooler, 330cc blacktop injectors (high impedance). The BPT versions of the Familia and Laser were only available in AWD models, and featured a viscous LSD centre and rear differentials.

Applications:

BPD

The mazda BPD engine (also commonly referred to as a BP2) was a revamp of the original BP engine (sometimes called BP1 for clarity's sake). It featured a larger crank nose, larger piston oil squirters, a main bearing support plate, better flowing inlet and exhaust ports. This was also the base engine for the Mazda Familia GT-R and GT-Ae. It is commonly known as the 'big turbo' variant as it utilised a much larger IHI RHF6CB water-cooled turbocharger (vj23). The BPD was used as the basis for the engine, with changes such as sodium-filled exhaust valves, larger (and front-mounted) intercooler, larger (440cc) low impedance fuel injectors and stronger engine internals helping to up the performance of the engine to produce 209hp (156kW) and 184lb·ft (255N·m). The VICS system of the N/A BP has been removed, as well as the boost cut from the ecu. 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 (2,200 built) and GTAe (300 built). ====BP-4W====

The 1998 Roadster 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). There was also a switch from the earlier problematic hydraulic lifters to solid lifters. The engine initially produced 140hp at 6500rpm, and 119lb·ft at 5000rpm. The United States 2004–2005 Mazdaspeed MX-5 turbo is based on this engine rather than the newer BP-Z3 and produces at 6000rpm and of torque at 4500rpm with slightly reduced compression ratio of 9.5:1. The Mazdaspeed turbo engine has no VICS, but does have VTCS which is often mistaken to be related to VICS.

Applications:

====BP-Z3==== In 2001, Mazda introduced the still BP-Z3 (also called BP-VE) variant of the BP engine. It features 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 and in the Mazda MX-5 SP.

See also