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ACL trimetal connecting rod bearings 52 mm Subaru EJ20 EJ22 EJ25

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Set of 8 trimetal connecting rod half-bearings for Subaru EJ20, EJ22, EJ25 (Ø 52 mm).

  • Brand and treatment: ACL Race
  • Compatibility: Impreza, Legacy, Forester, Outback, WRX
  • Engine codes: EJ20, EJ22, EJ25
  • Available sizes: standard to +0.50 mm, increased-clearance version (HX)

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  • The Subaru EJ boxer engines

    The EJ engines are the 1.5 to 2.5 litre flat-four (boxer) engines of Subaru's EJ family, in naturally aspirated and turbocharged versions; they power the Impreza, Legacy, Forester, Outback, Baja, Exiga, WRX and the Saab 9-2X. ACL lists a single bearing set for these engines: 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 51.984 / 52.000 mm
    Housing bore Ø 55.000 / 55.020 mm
    Width 16.5 mm
    ReferenceBrand and treatmentSizeWall thickness (mm)
    4B8296H-STDACL Race - UntreatedStandard1.500
    4B8296HX-STDACL Race - UntreatedStd, increased clearance (HX)1.487
    4B8296H-.025ACL Race - Untreated+0.0251.513
    4B8296H-.25ACL Race - Untreated+0.251.625
    4B8296H-.50ACL Race - Untreated+0.501.750

    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 reground0.055 to 0.065 mm
    Increased clearance (HX)Wider clearance: high oil flow, high rpm0.080 to 0.090 mm
    +0.025 mmPolished journal0.055 to 0.065 mm
    +0.25 mmJournal reground to 0.25 mm0.055 to 0.065 mm
    +0.50 mmJournal reground to 0.50 mm0.055 to 0.065 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 EJ boxer engines of the following Saab and Subaru models:

    BrandModel (chassis)Engine codePowerYears
    SAAB9-2X Estate 2.5 AWDEJ253, EJ255167–233 hp2004–2006
    SUBARUBAJA Pick-up 2.5 AWDEJ253, EJ255167–233 hp2002–2006
    SUBARUEXIGA (YA_) 2.5 AWD (YA9)EJ253170 hp2009–9999
    SUBARUFORESTER (SF_) 2.0 S Turbo AWD (SF5) / 2.5 AWD (SF9)EJ205, EJ25D167–177 hp1997–2002
    SUBARUFORESTER (SG_, S11SG) 2.0 CROSS SPORTS AWD (SG5) / 2.0 S Turbo AWD (SG5) / 2.5 AWD / 2.5 AWD (SG9) / 2.5 AWD (SG9, S11SG, S12SH) / 2.5 Prodrive Performance Pack AWDEJ205, EJ251, EJ253, EJ255, EJ257152–256 hp2002–2012
    SUBARUFORESTER (SH_) 2.0 AWD (SH5) / 2.5 AWD (SH9) / 2.5 Turbo AWD / 2.5 Turbo AWD (SH9)EJ205, EJ255230–270 hp2007–2015
    SUBARUIMPREZA Saloon (GC) 1.5 (GC1) / 1.6 (GC7) / 1.6 i (GC3) / 1.6 i AWD (GC4) / 1.8 i (GC5) / 1.8 i AWD (GC6) / 2.0 Turbo GT AWD (GC8) / 2.0 WRX AWD (GC8) / 2.0 WRX STi AWD (GC8) / 2.0 i (GC7) / 2.0 i AWD (GC8) / 2.2 GX AWD (GC8)EJ15E, EJ161, EJ18E, EJ205, EJ20E, EJ20G, EJ22E95–275 hp1992–2000
    SUBARUIMPREZA Saloon (GD) 1.5 (GD2) / 1.5 AWD (GD3) / 1.6 / 1.6 AWD (GD5) / 2.0 AWD (GDB) / 2.0 WRX STi AWD / 2.0 WRX STi AWD (GDB) / 2.0 WRX STi Prodrive Performance Package AWD / 2.0 WRX Turbo AWD (GDA) / 2.0 i AWD (GDA) / 2.0 i WRX AWD (GDA) / 2.2 / 2.5 AWD / 2.5 AWD (GDE) / 2.5 AWD (GDF) / 2.5 WRX STi AWD / 2.5 WRX STi AWD (GDF) / 2.5 i AWD (GDE) / 2.5 i WRX AWD (GDG)EJ15, EJ161, EJ205, EJ207, EJ22E, EJ251, EJ253, EJ255, EJ25795–320 hp2000–2009
    SUBARUIMPREZA Saloon (GE, GV) 2.5 AWD / 2.5 AWD (GVB) / 2.5 WRX SE AWD (GVE, GEE) / 2.5 WRX STi AWD (GVF)EJ253, EJ255, EJ257167–320 hp2007–9999
    SUBARUIMPREZA Hatchback (GR, GH, G3) 2.5 AWD / 2.5 AWD (GHE) / 2.5 STI CS400 AWD (GRF) / 2.5 WRX AWD (GRF) / 2.5 WRX S AWD / 2.5 WRX SE AWD (GRE) / 2.5 WRX STI 330S AWD / 2.5 WRX STI AWD / 2.5 WRX STi AWD (GRF)EJ253, EJ255, EJ257170–400 hp2008–2014
    SUBARUIMPREZA Estate 2.5 WRX STI AWDEJ257309 hp2007–2011
    SUBARUIMPREZA Estate (GF) 1.5 L (GF1) / 1.5 L AWD (GF2) / 1.6 (GF3) / 1.6 i (GF3) / 1.6 i AWD (GF4) / 1.8 i (GF5) / 1.8 i AWD (GF6) / 2.0 (GF8) / 2.0 Turbo GT AWD (GF8) / 2.0 WRX AWD (GF8) / 2.0 WRX STi AWD (GF8) / 2.0 i 16V AWD (GF8) / 2.0 i AWD (GF8) / 2.0 i Turbo AWD (GF8) / 2.2 / 2.2 AWD / 2.2 GX AWDEJ151, EJ15E, EJ161, EJ16E, EJ18E, EJ205, EJ207, EJ20E, EJ20G, EJ22E90–280 hp1992–2000
    SUBARUIMPREZA Estate (GG) 1.5 (GG2) / 1.5 AWD (GG3) / 1.6 / 1.6 AWD / 2.0 AWD (GGA) / 2.0 Turbo AWD (GGA) / 2.0 WRX AWD (GGA) / 2.0 WRX STi AWD (GGB) / 2.0 WRX Turbo AWD (GGA) / 2.2 / 2.5 AWD / 2.5 GB270 AWD / 2.5 WRX AWD / 2.5 WRX AWD (GGG)EJ15, EJ161, EJ205, EJ207, EJ22E, EJ253, EJ255, EJ25795–300 hp2000–2008
    SUBARUIMPREZA Coupé (GFC) 1.6 (GC4) / 1.6 AWD (GC4) / 2.0 AWD (GC8) / 2.0 AWD (GC8, GM8) / 2.0 Turbo AWD (GC8) / 2.0 i (GC8) / 2.2 AWD / 2.2 i / 2.5 AWDEJ161, EJ16E, EJ207, EJ20E, EJ20G, EJ22E, EJ25390–280 hp1994–2000
    SUBARULEGACY I (BC) 1.6 / 2.0 (BC4) / 2.0 4WD (BC5) / 2.0 GL / 2.2 / 2.2 4WDEJ16, EJ20E, EJ22E95–140 hp1989–1994
    SUBARULEGACY I Estate (BC, BF, BJ) 1.6 GL / 2.2 AWDEJ16, EJ22E95–132 hp1989–1994
    SUBARULEGACY II (BD) 1.8 4WD / 2.0 i (BD4) / 2.0 i 4WD (BD5) / 2.2 / 2.2 4WD / 2.5 4WD / 2.5 i 4WD (BD9)EJ18E, EJ20E, EJ22E, EJ25D103–167 hp1994–1999
    SUBARULEGACY II Estate (BG) 2.0 i 4WD (BG5) / 2.2 / 2.2 4WD / 2.5 4WD / 2.5 i / 2.5 i 4WD (BG9)EJ20E, EJ22E, EJ25D116–167 hp1994–1999
    SUBARULEGACY III (BE) 2.0 AWD (BE5) / 2.0 RSK AWD (BE5) / 2.5 AWDEJ206, EJ208, EJ253167–280 hp1998–2003
    SUBARULEGACY III Estate (BH) 2.0 AWD (BH5) / 2.0 RSK AWD (BH5) / 2.5 AWDEJ206, EJ208, EJ253167–280 hp1998–2003
    SUBARULEGACY IV (BL) 2.0 2WD / 2.0 AWD (BL5) / 2.0 GT Tuned By STI AWD (BL5) / 2.5 AWD / 2.5 STI AWD (BL9)EJ20Y, EJ255179–272 hp2003–2015
    SUBARULEGACY IV Estate (BP) 2.0 AWD (BP5) / 2.0 GT AWD (BP5) / 2.5 AWDEJ20Y, EJ253, EJ255167–272 hp2004–2009
    SUBARULEGACY OUTBACK (BG) 2.5 (BG9)EJ25D150–156 hp1996–1999
    SUBARULEGACY V (BM) 2.0 AWD (BM5) / 2.5 GT AWD (BM9) / 2.5 Turbo AWD / 2.5 i AWD / 2.5 i AWD (BM9)EJ206, EJ253, EJ255167–286 hp2009–9999
    SUBARULEGACY V Estate (BR) 2.0 AWD / 2.5 GT AWD (BR9) / 2.5 i AWD (BR9)EJ206, EJ208, EJ253, EJ255167–286 hp2008–2014
    SUBARUOUTBACK (BH) 2.5 AWDEJ253167 hp1999–2003
    SUBARUOUTBACK (BP) 2.5 AWD / 2.5 AWD (BP9) / 2.5 BiFuel AWDEJ251, EJ252, EJ253, EJ255155–253 hp2003–2010
    SUBARUOUTBACK (BR) 2.5 BiFuel AWD / 2.5 i AWD / 2.5 i AWD (BR9)EJ253167–175 hp2009–9999
    SUBARUWRX Saloon (GJ) 2.5 AWD / STi 2.5 AWDEJ255, EJ257233–309 hp2011–9999
    SUBARUWRX Saloon (VA) STi 2.5 AWD (VAF, VAG)EJ257301 hp2013–2022
    SUBARUWRX Hatchback (GP) STi 2.5 AWDEJ257300 hp2010–2014
    SUBARUWRX Estate 2.5 AWD / STi 2.5 AWDEJ255, EJ257233–309 hp2011–9999

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