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1.8L 16v - BP
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1.8L 16v - BP
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Set of 10 tri-metal crankshaft main bearing half shells for Mazda B, BP and ZM series engines (Ø 49.94 mm).
The Mazda B, BP and ZM series four-cylinder petrol engines are fitted to the Mazda 121, 323, MX-5 and Protege as well as to the Ford Laser, Capri, Meteor and Festiva. All the applications listed below share the same crankshaft journal and main bearing dimensions: a single set of bearings covers these engines.
The crankshaft of these engines runs on five main bearings. Each journal turns between two half shells, one seated in the block and the other in the main bearing cap: they carry the crankshaft. The ACL Race Series and KING RACING tri-metal sets shown here replace them on built engines.
A tri-metal bearing stacks three layers: a steel back, a copper-lead intermediate layer with high load capacity and an anti-friction running surface that protects the journal. The complete set contains 10 half shells, five pairs for five main bearings.
An aluminium bi-metal takes around 8,000 psi, a performance tri-metal up to 12,000 psi, 50% more. Hence better resistance and better durability on turbocharged, supercharged and high-revving engines.
| ACL bearings Crankshaft journal Ø 49.938 / 49.956 mm Housing bore Ø 53.998 / 54.018 mm Width 17.63 mm | King bearings Crankshaft journal Ø 49.939 / 49.957 mm Housing bore Ø 53.998 / 54.018 mm Width 17.5 mm |
| Reference | Brand and treatment | Size | Wall thickness (mm) |
|---|---|---|---|
| 5M8353H-STD | ACL Race - Untreated | Standard | 2.013 |
| 5M8353HX-STD | ACL Race - Untreated | Std, increased clearance (HX) | 2.000 |
| 5M8353H-.025 | ACL Race - Untreated | +0.025 | 2.0255 |
| 5M8353H-.25 | ACL Race - Untreated | +0.25 | 2.138 |
| 5M8353H-.50 | ACL Race - Untreated | +0.50 | 2.263 |
| MB5304XP | King Racing - Untreated | Standard | 2.013 |
| MB5304XP STDX | King Racing - Untreated | Std, increased clearance (STDX) | 2.000 |
| MB5304XP.026 | King Racing - Untreated | +0.026 | 2.026 |
| MB5304XP0.25 | King Racing - Untreated | +0.25 | 2.140 |
The running clearance is the gap between the bearing and the journal where the oil film flows.
In operation, the crankshaft journal does not rub against the bearing: it rides on this oil film, which carries the load. Clearance sets the thickness of this film: too tight, oil flows poorly, temperature rises and the risk of seizure increases; too loose, oil escapes, the film loses load-carrying capacity and oil pressure drops. The right clearance is the balance between adequate lubrication and a well-maintained oil film.
| Size / grade | When to choose it | ACL Race Series | King XP |
|---|---|---|---|
| Standard (STD) | Standard journal, not reground | 0.053 to 0.063 mm | 0.050 mm - 0.063 mm |
| Increased clearance (HX / STDX) | Wider clearance: high oil flow, high rpm | 0.078 to 0.088 mm | 0.075 mm - 0.088 mm |
| +0.025 / +0.026 mm | Polished journal | 0.053 to 0.063 mm | 0.050 mm - 0.063 mm |
| +0.25 mm | Journal reground to 0.25 mm | 0.053 to 0.063 mm | 0.050 mm - 0.063 mm |
| +0.50 mm | Journal reground to 0.50 mm | 0.053 to 0.063 mm |
Check at assembly: lay a calibrated strip (Plastigauge) on the journal, tighten the main cap following the manufacturer's procedure, then compare the width of the crushed strip with the gauge to read the clearance.
The ACL and King main bearings shown here are trimetal bearings, designed for engine building and racing. Compared with an original bearing, they handle far higher loads: they cope with increased power, high rpm or the addition of a turbo or supercharger, where a standard bearing quickly reaches its limit.
 | ACL Bearing Company, an Australian manufacturer of high-performance engine bearings since 1949, offers with its Race Series precise tri-metal bearings, available in many sizes and proven on built engines worldwide. |
 | King Engine Bearings, an Israeli manufacturer of high-performance engine bearings since the 1960s, offers with its pMax Black tri-metal alloy bearings designed for heavy loads. |
| Criterion | ACL Race Series | King Racing |
| Cross-section |  |  |
| Type | High-performance trimetal bearing | High-performance trimetal bearing |
| Country of manufacture | Australia | Israel |
| Construction | Trimetal: steel back, copper layer, soft surface | Trimetal: steel back, copper layer, soft surface |
| Alloy | Race Series (copper-lead) | pMax Black (hardened copper-lead) |
| Protective coating | No | No |
| Available sizes | Standard to +0.50 mm (+ increased clearance HX) | Standard to +0.25 mm (+ increased clearance STDX) |
This main bearing set fits the following vehicles, according to the engine code:
| Brand | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| Citroën | BX (XB-_) | B6D | 116 hp | 1987–1992 |
| Citroën | BX Estate (XB-_) | B6D | 116 hp | 1987–1992 |
| Citroën | Visa | B6D | 113 hp | 1986–1991 |
| Eunos | Roadster I (NA) | BP, BP-ZE | 130 hp | 1989–1997 |
| Eunos | Roadster II (NB) | B6D | 110 hp | 1998–2005 |
| Ford | Bantam I Pick-up | B6 | 82 hp | 1982–1994 |
| Ford | Bantam II Pick-up | B3, B6 | 68–86 hp | 1994–2002 |
| Ford | Laser Hatchback | B3, B6 | 68–105 hp | 1986–1996 |
| Ford | Meteor Saloon (KC, KE) | B3, B6 | 68–105 hp | 1986–1995 |
| Ford | Tracer Saloon (BF) | B3, B6 | 68–105 hp | 1995–2000 |
| Ford | Tracer Hatchback (BF) | B3, B6 | 68–105 hp | 1995–2002 |
| Ford Asia & Oceania | Festiva Hatchback (D2_P) | B3-MI, B5-ME | 76–101 hp | 1993–1997 |
| Ford Asia & Oceania | Festiva Miniwagon (DW_W) | B5-ME | 101 hp | 1996–2003 |
| Ford Asia & Oceania | Laser Hatchback (BA_3, BF_3, BF_4, BG_3, BJ_4) | B3 | 73 hp | 1994–1999 |
| Ford Australia | Capri Convertible (SA, SB, SC, SE) | B6, B6T | 83–136 hp | 1989–1994 |
| Ford Australia | Festiva (WA) | B3 | 63 hp | 1991–1994 |
| Ford Australia | Festiva (WB) | B3 | 64 hp | 1994–1997 |
| Ford Australia | Festiva (WD) | B3, B5 | 64–91 hp | 1997 |
| Ford Australia | Festiva (WF) | B3, B5 | 64–76 hp | 1998–2001 |
| Ford Australia | Laser Saloon (KE) | B6 | 72–83 hp | 1987–1990 |
| Ford Australia | Laser Saloon (KF) | B6, BP | 87–103 hp | 1990–1991 |
| Ford Australia | Laser Saloon (KH) | B6, BP | 87–103 hp | 1991–1994 |
| Ford Australia | Laser Saloon (KJ, KL) | B6, BP | 107–125 hp | 1994–1999 |
| Ford Australia | Laser Saloon (KN) | B6, BP | 105–125 hp | 1999–2001 |
| Ford Australia | Laser Saloon (KQ) | ZM | 102 hp | 2001–2002 |
| Ford Australia | Laser Hatchback (KC) | B6 | 72–83 hp | 1985–1987 |
| Ford Australia | Laser Hatchback (KE) | B6, B6T | 72–136 hp | 1987–1990 |
| Ford Australia | Laser Hatchback (KF) | B6, BP | 87–125 hp | 1990–1991 |
| Ford Australia | Laser Hatchback (KH) | B6, BP | 87–125 hp | 1991–1994 |
| Ford Australia | Laser Hatchback (KJ, KL) | B6, BP | 109–125 hp | 1994–1999 |
| Ford Australia | Laser Hatchback (KN) | B6, BP, ZM | 105–125 hp | 1999–2001 |
| Ford Australia | Laser Hatchback (KQ, KN III) | ZM | 102 hp | 2001–2002 |
| Ford Australia | Laser Estate (KE) | B6 | 72–83 hp | 1987–1994 |
| Ford Australia | Meteor Saloon (GC) | B6 | 72–83 hp | 1985–1987 |
| Ford Australia | Meteor Estate (GC) | B6 | 72 hp | 1986–1987 |
| Haima (Faw) | Family 323 | ZM | 97 hp | 2004–2006 |
| Haima (Faw) | Family II Saloon | ZM | 95 hp | 2006–2010 |
| Kia | Avella (KBA1) | B3 | 75 hp | 1995–2001 |
| Kia | Avella Hatchback (KBA1) | B3, B5 | 75–92 hp | 1995–2001 |
| Kia | Pride (DA) | B1, B3 | 52–72 hp | 1990–2001 |
| Kia | Pride Estate | B3 | 64 hp | 1999–2001 |
| Kia | RIO I Hatchback (DC) | B3 | 82 hp | 2000–2005 |
| Kia | Sephia (FA) | B5, B6 | 80 hp | 1995–1997 |
| Kia | Sephia Saloon (FA) | B5, B6 | 80–92 hp | 1992–1997 |
| Kia | Shuma Saloon (FB) | B5 | 80 hp | 1996–1998 |
| Mazda | 121 I (DA) | B1, B3 | 55–60 hp | 1987–1991 |
| Mazda | 121 II (DB) | B1, B5-MI | 54–88 hp | 1990–1997 |
| Mazda | 323 C IV (BG) | B6, BP, BP TURBO | 88–209 hp | 1989–1994 |
| Mazda | 323 C V (BA) | BP, BP-ZE, Z5-DE | 88–125 hp | 1994–1998 |
| Mazda | 323 F IV (BG) | B6, B6T, BP | 88–140 hp | 1987–1994 |
| Mazda | 323 F V (BA) | BP, BP-ZE, Z5-DE | 88–135 hp | 1994–1998 |
| Mazda | 323 F VI Hatchback (BJ) | ZL-VE, ZM | 95–131 hp | 1998–2004 |
| Mazda | 323 III Saloon (BF) | B3, B5, B6, B6T | 60–140 hp | 1985–1991 |
| Mazda | 323 III Hatchback (BF) | B3, B5, B6, B6T | 60–140 hp | 1985–1993 |
| Mazda | 323 III Station Wagon (BW) | B5, B6 | 73–86 hp | 1986–1995 |
| Mazda | 323 P V (BA) | Z5-DE | 88 hp | 1996–1998 |
| Mazda | 323 S IV (BG) | B6, BP, BP TURBO | 88–163 hp | 1989–1996 |
| Mazda | 323 S V (BA) | BP, BP-ZE, Z5-DE | 88–125 hp | 1994–1998 |
| Mazda | 323 S VI Saloon (BJ) | B3, ZM | 72–106 hp | 1998–2004 |
| Mazda | MX-5 I (NA) | BP, BP-ZE | 130–135 hp | 1993–1998 |
| Mazda | MX-5 II (NB) | BP TURBO, BP-ZE, BP4W, BPD | 141–185 hp | 1998–2005 |
| Mazda | Rustler | B6 | 105 hp | 1993–2004 |
| Mercury | Capri Convertible | B6D, B6T | 102–135 hp | 1990–1994 |
| Peugeot | 205 I (741A/C) | B6D | 116 hp | 1983–1987 |
| Peugeot | 205 I Convertible (741B, 20D) | B6D | 116 hp | 1987–1992 |
| Peugeot | 205 II (20A/C) | B6D | 116 hp | 1987–1989 |
| Peugeot | 309 I (10C, 10A) | B6D | 113 hp | 1986–1989 |
| Peugeot | 309 II (3C, 3A) | B6D | 116 hp | 1989–1993 |
| Saipa | Tiba Saloon | B5 | 80 hp | 2008– |
| Saipa | Tiba II Hatchback | B5 | 80 hp | 2016– |
| Sao | Penza Saloon | B3 | 68 hp | 1991–1993 |
| Sao | Penza Hatchback | B3 | 68 hp | 1991–1993 |
| Timor | S5 (FA) | B5 | 105 hp | 1997–2008 |
| VW | GOL G1 | BP | 52–54 hp | 1982–1986 |
| VW | Saveiro G1 (147) | BP | 69 hp | 1982–1986 |
