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Trimetal connecting rod bearings Suzuki M15A M16A M18A

New product

Set of 8 trimetal connecting rod half-bearings for the Suzuki M15A, M16A and M18A four-cylinder engines.

  • Brands and treatments: ACL Race and King Racing
  • Compatibility: Swift, Ignis, Grand Vitara, Liana, SX4, Vitara, Jimny
  • Engine codes: M15A, M16A, M18A
  • Available sizes: standard to +0.25 mm, increased-clearance version (HX)

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85,36 € tax incl.

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89,86 € tax incl.

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  • The Suzuki M15A, M16A and M18A four-cylinder engines

    The M15A, M16A and M18A are Suzuki's 1.5, 1.6 and 1.8 litre 16-valve twin overhead camshaft four-cylinder engines; they power the Swift, Ignis, Grand Vitara, Liana, SX4, Vitara and Jimny, among others. ACL lists a single bearing set for these engines.

    From the factory, Suzuki fits these engines with standard production connecting rod bearings. These bearings are sized for the loads of the original engine: as soon as power, engine speed or compression increase, they reach their limits.

    Trimetal connecting rod bearings

    A trimetal 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 8 half shells, four pairs for a four-cylinder engine.

    The original bearing relies on an aluminium alloy over a steel back, intended for low to medium loads, whereas trimetal is designed for high, sustained loads: an aluminium bi-metal takes around 8,000 psi, a performance trimetal up to 12,000 psi, 50% more. Hence better resistance and better durability on turbocharged, supercharged and high-revving engines.

    Technical specifications

    Fitment dimensions common to all references
    ACL bearings
    Crankpin Ø 41.982 / 42.000 mm
    Housing bore Ø 45.000 / 45.018 mm
    Width 18.13 mm    		King bearings
    Crankpin Ø 41.981 / 41.999 mm
    Housing bore Ø 45.001 / 45.019 mm
    Width 18.1 mm
    ReferenceBrand and treatmentSizeWall thickness (mm)
    4B8440H-STDACL Race - UntreatedStandard1.490
    4B8440HX-STDACL Race - UntreatedStd, increased clearance (HX)1.477
    4B8440H-.025ACL Race - Untreated+0.0251.503
    4B8440H-.25ACL Race - Untreated+0.251.615
    CR4594XPKing Racing - UntreatedStandard1.490
    CR4594XP.026King Racing - Untreated+0.0261.503

    Running clearance

    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 / gradeWhen to choose itACL Race SeriesKing XP
    Standard (STD)Standard journal, not reground0.047 to 0.055 mm0.042 mm - 0.047 mm
    Increased clearance (HX)Wider clearance: high oil flow, high rpm0.072 to 0.080 mm
    +0.025 / +0.026 mmPolished journal0.047 to 0.055 mm0.042 mm - 0.047 mm
    +0.25 mmJournal reground to 0.25 mm0.047 to 0.055 mm

    Checking on assembly: lay a calibrated strip (Plastigauge) on the journal, torque the rod cap to spec, then compare the crushed strip against the gauge to read the clearance.

    Plastigauge

    Order the Plastigauge →

    Technical guide

    The ACL and King rod 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.

    The two brands

    ACLACL Bearing Company, an Australian manufacturer of high-performance engine bearings since 1949, offers with its Race Series precise trimetal bearings, available in many sizes and proven on built engines worldwide.
    King RacingKing Engine Bearings, an Israeli manufacturer of high-performance engine bearings since the 1960s, offers with its pMax Black trimetal alloy bearings designed for heavy loads.

    Construction and advantages

    CriterionACL Race SeriesKing Racing
    Cross-sectionCross-section of an ACL Race Series trimetal bearingCross-section of a King Racing trimetal bearing
    TypeHigh-performance trimetal bearingHigh-performance trimetal bearing
    Country of manufactureAustraliaIsrael
    ConstructionTrimetal: steel back, copper layer, soft surfaceTrimetal: steel back, copper layer, soft surface
    AlloyRace Series (copper-lead)pMax Black (hardened copper-lead)
    Protective coatingNoNo
    Available sizesStandard to +0.25 mm (+ increased clearance HX)Standard and +0.026 mm

    Vehicle compatibility

    This connecting rod bearing set fits the M15A, M16A and M18A four-cylinder engines of the following Suzuki models:

    BrandModel (chassis)Engine codePowerYears
    SuzukiSX4 Saloon (GY, RW) 1.6 (RW416) / 1.6 (RW 416) / 1.6 VVTM16A101–120 hp2007–
    SuzukiSX4 (EY, GY) 1.6 VVT 4x4 (RW416) / 1.6 VVT (RW416, YA21S) / 1.6 (RW416, YA21S) / 1.6 VVT 4x4 / 1.6 VVT / 1.6 LPGM16A101–120 hp2006–
    SuzukiSWIFT IV (FZ, NZ) 1.6 (AZG416, AZH416, RS416, ZC32S, ZA32S) / 1.6 (AZG 416, ZC32S, ZA32S)M16A136–142 hp2012–2017
    SuzukiSX4 S-CROSS (JY) 1.6 AllGrip (AKK 416) / 1.6 (AKK 416) / 1.6 (AKK416, YA22S) / 1.6 AllGrip (AKK416, YB22S) / 1.6 (AKK416) / 1.6 AllGrip (AKK416) / 1.6 VVTM16A116–126 hp2013–2022
    SuzukiLIANA Hatchback 1.6 (RH416) / 1.6 4WD / 1.6 i (RH416) / 1.6M16A103–107 hp2001–2007
    SuzukiLIANA (ER, RH_) 1.6 (RH416) / 1.6 4WD (RH416) / 1.6 i (RH416)M16A103–107 hp2002–
    SuzukiGRAND VITARA II (JT, TE, TD) 1.6 AWD (JB416) / 1.6 (JB416) / 1.6 AWD (TA74, JB416)M16A99–106 hp2005–
    SuzukiSWIFT III (MZ, EZ) 1.6 (RS416, RR 416, ZC31S)M16A125 hp2006–2015
    SuzukiJIMNY Closed Off-Road Vehicle (SN, JB_) 1.6 VVTM16A103 hp2004–
    SuzukiVITARA (LY) 1.6 (APK 416) / 1.6 AllGrip (APK 416) / 1.6 (APK416, YD21S) / 1.6 AllGrip (APK416, YE21S, YD21S) / 1.6 / 1.6 AllGrip / 1.6 VVT / 1.6 VVT AllGripM16A116–126 hp2015–
    SuzukiSX4 (EY, GY) 1.5 VVT (RW415, YA11S) / 1.5 (RW 415) / 1.5 VVT 4x4 (RW 415) / 1.5 VVTi (YA11S) / 1.5 VVTi 4x4 (RW415, YB11S)M15A99–112 hp2006–
    SuzukiIGNIS I (FH) 1.5 (HV81, RG415) / 1.5 Sport (RG415) / 1.5 Sport (HT81S)M15A109–116 hp2000–2005
    SuzukiIGNIS II (MH) 1.5 (RM415) / 1.5 4x4 (RM415)M15A99 hp2003–2012
    SuzukiSWIFT III (MZ, EZ) 1.5 (RS415, ZC21S) / 1.5 4x4 (RS 415, ZD21S) / 1.5 4x4 (RS415, ZD21S) / 1.5 (ZC21S)M15A101–110 hp2005–2011
    SuzukiLIANA Hatchback 1.8 i (RH418, RD51S, RC51S) / 1.8 i AWD (RC51S, RD51S)M18A125 hp2001–2007
    SuzukiLIANA (ER, RH_) 1.8 i (RH418) / 1.8 i AWDM18A125 hp2001–
    SuzukiLIANA (ER, RH_) 1.5 (RH415) / 1.5 AWD (RA21S)M15A110 hp2004–2007
    SuzukiLIANA Hatchback 1.5 (RH415) / 1.5 AWD (RB21S)M15A110 hp2004–2007
    SuzukiSX4 S-CROSS (JY) 1.5 (AKN415)M15A109 hp2016–2022
    SuzukiSX4 Saloon (GY, RW) 1.5 VVT (RW415, YC11S) / 1.5 (YC11S)M15A99–111 hp2007–2014
    SuzukiSWIFT VI (ZD_, ZC_) 1.5 AWD (ZD21S)M15A110 hp2023–

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