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Trimetal connecting rod bearings ACL Ford Duratec HE 2.0 Mazda LF

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Set of 8 trimetal connecting rod half-bearings for the Ford Duratec HE 2.0 and Mazda LF.

  • Brand and treatment: ACL Race
  • Compatibility: Ford Focus, Mondeo, Fiesta ST, Mazda 3, MX-5
  • Engine codes: Duratec HE 2.0 (CJBA, AODA, AOBA, N4JB…), LF (LF-DE, LF-VE, LF-VD)
  • Available sizes: standard to +0.25 mm, increased-clearance version (HX)

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49,41 € tax incl.

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52,01 € tax incl.

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  • The Mazda LF and Ford Duratec HE 2.0 four-cylinder engine

    Mazda's LF (MZR 2.0), called Duratec HE 2.0 by Ford, is a 2 litre inline four with twin overhead camshafts and 16 valves. It powers the Ford Focus, Focus C-MAX, Mondeo and Fiesta ST as well as the Mazda 3 and MX-5. ACL lists a single bearing set for these versions: same crankpin diameter, a single set covers the family.

    From the factory, this engine is fitted with standard production connecting rod bearings, sized for the loads of the original engine: as soon as power, engine speed or boost pressure 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 46.980 / 47.000 mm
    Housing bore Ø 50.025 / 50.045 mm
    Width 16.25 mm
    ReferenceBrand and treatmentSizeWall thickness (mm)
    4B4390H-STDACL Race - UntreatedStandard1.503
    4B4390HX-STDACL Race - UntreatedStd, increased clearance (HX)1.491
    4B4390H-.025ACL Race - Untreated+0.0251.516
    4B4390H-.25ACL Race - Untreated+0.251.628

    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 Series
    Standard (STD)Standard journal, not reground0.051 to 0.060 mm
    Increased clearance (HX)Wider clearance: high oil flow, high rpm0.076 to 0.085 mm
    +0.025 mmPolished journal0.051 to 0.060 mm
    +0.25 mmJournal reground to 0.25 mm0.051 to 0.060 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 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 brand

    ACL Bearing CompanyACL 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.

    Vehicle compatibility

    This connecting rod bearing set fits the 2.0 LF / Duratec HE four-cylinder of the following Ford and Mazda models:

    BrandModel (chassis)Engine codePowerYears
    FORDFIESTA V (JH_, JD_) ST150N4JB150 hp2005–2008
    FORDFOCUS I (DAW, DBW) 2.0AODA, AODE140–145 hp2005–2008
    FORDFOCUS I Saloon (DFW) 2.0AODA, AODE140–145 hp2005–2009
    FORDFOCUS II (DA_, HCP, DP) 2.0AODA, AODB, AODE, SYDA140–145 hp2004–2012
    FORDFOCUS II Saloon (DB_, FCH, DH) 2.0AODA, AODB, AODE, SYDA141–148 hp2005–2013
    FORDFOCUS II Turnier (DA_, FFS, DS) 2.0AODA, AODB, AODE, SYDA145 hp2004–2012
    FORDFOCUS II Convertible 2.0AODA, AODB, AODE, SYDA145 hp2006–2010
    FORDFOCUS C-MAX (DM2) 2.0AODA, AODB, AODE, SYDA145 hp2004–2007
    FORDMONDEO III (B5Y) 2.0 16VCJBA, CJBB146 hp2000–2007
    FORDMONDEO III Saloon (B4Y) 2.0 16VCJBA, CJBB144–146 hp2000–2007
    FORDMONDEO III Turnier (BWY) 2.0 16VCJBA, CJBB146 hp2000–2007
    FORDMONDEO IV (BA7) 2.0AOBA, AOBC, TBBA, TBBB145 hp2007–2015
    FORDMONDEO IV Saloon (BA7) 2.0AOBA, AOBC, TBBA, TBBB145 hp2007–2015
    FORDMONDEO IV Turnier (BA7) 2.0AOBA, AOBC, TBBA, TBBB145 hp2007–2015
    FORDMONDEO IV Van 2.0AOBC145 hp2007–2014
    MAZDA3 (BK) 2.0LF-DE, LF-VE, LF50, LF72, LFN7, LFN8141–150 hp2003–2009
    MAZDA3 Saloon (BK) 2.0LF-DE, LF-VE, LF50, LF72, LFN7, LFN8141–150 hp2003–2009
    MAZDA3 (BL) 2.0 / 2.0 DISILF-VD, LF-VDS, LF-VE, LF5H, LF5W, LFZ2143–151 hp2008–2014
    MAZDA3 Saloon (BL) 2.0 / 2.0 DISILF-VE, LF5H, LF5W, LFZ2143–151 hp2009–2014
    MAZDAMX-5 III (NC) 2.0LF-VE, LFG7, LFG8, LFY7, LFZD160–173 hp2005–2016