Mazda B engine

The Mazda B-series engine - not to be confused with the Mazda B-Series truck - is a small-sized, iron-block, inline four-cylinder with belt-driven SOHC and DOHC valvetrain ranging in displacement from 1.1 to 1.8 litres. 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.

Mazda B engine
Overview
ManufacturerMazda
Production1985-2005
Layout
ConfigurationInline-four engine
Displacement
  • 1,138 cc (69.4 cu in)
  • 1,290 cc (79 cu in)
  • 1,324 cc (80.8 cu in)
  • 1,498 cc (91.4 cu in)
  • 1,597 cc (97.5 cu in)
  • 1,839 cc (112.2 cu in)
  • 1,995 cc (121.7 cu in)
Cylinder bore
  • 68.0 mm (2.68 in)
  • 71.0 mm (2.80 in)
  • 78.0 mm (3.07 in)
  • 83.0 mm (3.27 in)
Piston stroke
  • 67.5 mm (2.66 in)
  • 78.4 mm (3.09 in)
  • 83.6 mm (3.29 in)
  • 85.0 mm (3.35 in)
Block materialCast iron
Head materialAluminum
Valvetrain
Combustion
Fuel typeGasoline
Oil systemWet sump
Cooling systemWater-cooled
Chronology
SuccessorMazda Z engine

B1

1.1 L (1,138 cc) B1 - (68.0x78.4 mm) - 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

BJ

The 1.3 L (1,290 cc) BJ engine (78.0x67.5 mm) 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 develops 88 PS (65 kW) at 7000 rpm and is equipped with Mazda's "EGi" single-point fuel injection. It is a short-stroke version of the B5/B6 engines.[1]

B3
Mazda B3E

1.3 L (1,324 cc) B3 – (71.0×83.6 mm). 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) (54 hp and 72 hp version), 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: 63 hp (47 kW) at 5000 rpm Torque: 73 lb⋅ft (99 N⋅m) at 3000 rpm

Carbureted Engine: Horsepower: 63 hp (47 kW)

Later versions (Mazda 323 91-98 etc.) produced 73 hp (54 kW) at 5500 rpm, and 80 lb⋅ft (110 N⋅m) of torque at 4000 rpm[2]

B5
Power Torque Norm Fuel
system		 Fitment Markets
PS kW at rpm kgm Nm lbft at rpm
8V
SOHC		 B5 76 56 6,000 11.4 112 82 3,500 JIS net carb 1987-1989 Familia BF/Ford Laser KE,[3] 1987-1994 Familia BF Wagon,[4] 1988.07-1989.02 Mazda Étude[5] JDM, NZ
73 54 5,700 11.4 112 82 3,200 ECE Familia BF Wagon[4] EU
82 60 5,500 12.2 120 88 2,500 Timor S515 RI
88 65 5,000 13.8 135 100 4,000 DIN EGI 1992-1997 2nd gen. Ford Festiva Aus
16V
SOHC		 B5-M 91 67 6,500 12.4 122 90 4,000 JIS net carb 1989.02-1991.01 Familia BG,[6][7] 1989-1994 Ford Laser KF/KH[3] JDM, NZ
B5-MI 88 65 6,500 12.0 118 87 4,000 JIS net EGI-S 1991-1998 Autozam Revue[8] JDM
94 69 6,500 12.5 123 90 4,000 JIS net 1990.02-1994.06 Familia BG[4][7] JDM
B5-ME 80 59 5,500 12.2 120 88 2,500 ECE EGI 1992-1997 Kia Sephia[9] EU
88 65 5,500 13.5 132 98 2,500 JIS net
KS		 1992-1994 Kia Sephia[10] RoK, others
92 68
100 74 6,300 12.1 119 88 5,000 JIS net
KS		 1993-2000 Ford Festiva/Kia Avella[10] JDM, RoK,
others
100 74 6,000 13.0 127 94 4,500 JIS net 1996-2002 Demio[11]/Ford Festiva Mini Wagon JDM
16V
DOHC		 B5-DE 105 77 5,500 15.0 147 108 4,000 KS EGI 1992-2000 Kia Sephia, 1992-1997 Timor S515i DOHC, 2000-2005 Kia Rio RoK, RI,
others
110 81 6,500 12.9 127 93 5,500 JIS net 1989-1991.08 Familia BG and Astina,[6] 1989-1994 Ford Laser KF/KH[3] JDM
115 85 6,500 13.5 132 98 5,000 JIS net 1991.08-1994 Familia BG and Astina with AT JDM
120 88 6,500 13.5 132 98 5,500 JIS net 1991.08-1994 Familia BG and Astina with MT JDM

8-valve SOHC

1.5 L (1,498 cc) B5 - (78.0x78.4 mm) - The SOHC 8-valve B5 upped the displacement to 1.5 L and was found in the 1987-1989 Mazda Familia, 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

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 Eunos Presso and 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] This was also installed in the Japanese market "Ford Laser"-badged versions of the Familia.

B6

1.6 L (1,597 cc) B6 — (78.0x83.6 mm) — 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 DOHC 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, but with two camshafts and 88 hp. Kia's version of the B6 (16-valve DOHC) had a marginally shorter stroke (at 83.4 mm), for a total displacement of 1,594 cc. This engine was used in the Rio, Sephia II, and Shuma.[13]

8-valve SOHC

16-valve SOHC

16-valve DOHC

B6-2E

1.6 L (1,597 cc) B6-2E - (78.0x83.6 mm), also known as B6-ME - This was a variant of the B6-E with a SOHC 16-valve cylinder head.

B6T

1.6 L (1,597 cc) B6T - (78.0x83.6 mm) - 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 132 hp (98 kW) and 136 lb⋅ft (184 N⋅m). The Japanese version was slightly more powerful, producing 140 PS (103 kW) and 19.0 kg⋅m (186 N⋅m) 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 150 PS (110 kW) and 20.0 kg⋅m (196 N⋅m) respectively through the use of a slightly different turbocharger; engine internals remained otherwise identical.

B6D
Mazda B6D, 3rd generation

1.6 L (1,597 cc) B6D - (78.0x83.6 mm) - The same strengthened and fuel-injected 16-valve DOHC B6 but with higher compression, no turbo, and the first Mazda engine to feature 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 107 hp (79 kW).

B6ZE(RS)
B6ZE(RS)

1.6 L (1,597 cc) B6ZE(RS) - (78x83.6 mm) - 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 7,200 rpm redline. An aluminium 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 86 kW (115 hp) at 6,500 rpm, and 136 N⋅m (100 lbf⋅ft) of torque at 5,500 rpm. The later European version (1994-1997) produced 66 kW (90 hp) at 6,500 rpm, and 129 N·m (95 lb·ft) at 5,500 rpm. It was then updated to 82 kW (110 hp) at 6,500 rpm and 134 N·m (99 lb·ft) at 5,000 rpm for the models from 1998 to 2005. The Japanese version of the engine also had a 9.4:1 compression ratio and produced 120 hp (90 kW) at 6,500 and 100 lb·ft (136 N·m) at 5,500. After 1998 the power was increased to 125 hp (93 kW) at 6,500 and 105 lb·ft (143 N·m) at 5,000.

B8

The 1.8 L (1,839 cc) B8 (sometimes "BP") is not just a bored and stroked B6. Rather, it uses 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, the American 1990-1994 Mazda Protege, 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 6,000 rpm redline, and multi-port fuel injection.[14] Power outputs are:

  • 103 hp (77 kW), 111 lb-ft (U.S./Canadian market)[4]
  • 106 PS (78 kW) at 5,300 rpm, 151 N⋅m (111 lb⋅ft) at 4,000 rpm (European markets)[4]

BP

The 1,839 cc (1.8 L) BP, featuring a bore x stroke of 83 mm × 85 mm (3.27 in × 3.35 in), 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 7,000 rpm 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 96 kW (131 PS; 129 bhp) at 6,000 rpm and 165 N⋅m (122 lbf⋅ft) at 4,000 rpm. 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
Mazda BPT - Turbocharged 1.8L

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 from G7+ CJ26 AH7 crankshaft. 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 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 (440 cc) low impedance fuel injectors and stronger engine internals helping to up the performance of the engine to produce 209 hp (156 kW) and 184 lb·ft (255 N·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 1999 MX-5 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 140 hp at 6500 rpm, and 119 lb·ft at 5500 rpm. The United States 2004-2005 Mazdaspeed MX-5 turbo is based on this engine rather than the newer BP-Z3 and produces 178 bhp (180 PS; 133 kW) at 6000 rpm and 226 N⋅m; 166 lbf⋅ft (23 kg⋅m) of torque at 4500 rpm with slightly reduced compression ratio of 9.5:1.[15] 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 1.8 L (1,839 cc) 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, version of this engine produced 210 hp (157 kW) and 206 lb·ft (280 N·m) in the Mazda MX-5 SP.

See also
  1. "Goo-net Catalog: Ford Festiva GT-A". Goo-net. Retrieved 2011-02-15.
  2. "1998 Mazda 323 1.3 LX technical specifications". Carfolio.com. Retrieved 2011-02-14.
  3. Wong, Edward (June 2005). "Ford Laser Engine Guide (NZ and Japan)". TX3.nz.com. Archived from the original on 2012-12-10. Retrieved 2011-02-15.
  4. Büschi, Hans-Ulrich, ed. (March 1991). Automobil Revue 1991 (in German and French). 86. Berne, Switzerland: Hallwag AG. pp. 380–381. ISBN 3-444-00514-8.
  5. Mastrostefano, Raffaele, ed. (1990). Quattroruote: Tutte le Auto del Mondo 1990 (in Italian). Milano: Editoriale Domus S.p.A. pp. 471–472.
  6. Tutte le Auto del Mondo 1990, pp. 458-460
  7. "Mazda Familia catalog". Goo Auto Inc. Archived from the original on 2011-07-11. Retrieved 2011-02-18.
  8. Automobil Revue 1991, p. 379
  9. Büschi, Hans-Ulrich, ed. (6 March 1997). Automobil Revue 1997 (in German and French). 92. Berne, Switzerland: Hallwag AG. p. 317. ISBN 3-444-10479-0.
  10. Büschi, Hans-Ulrich, ed. (10 March 1994). Automobil Revue 1994 (in German and French). 89. Berne, Switzerland: Hallwag AG. pp. 324–325. ISBN 3-444-00584-9.
  11. Automobil Revue 1997, p. 349
  12. "1994 Mazda Familia: Interplay X". auto.vl.ru. Archived from the original on 2011-08-15. Retrieved 2011-02-14.
  13. Nötzli, Max, ed. (7 March 2002). Automobil Revue 2002 (in German and French). 97. Berne, Switzerland: Büchler Grafino AG. p. 337. ISBN 3-905386-02-X.
  14. Edwin Man. "Protegé FAQ: BP-ME". Protegefaq.net. Retrieved 2012-07-30.
  15. "2004 Mazda Mazdaspeed MX-5 Miata Turbo US". carfolio.com. February 28, 2013. Retrieved July 27, 2018.
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