2.8L 24v - A28 / Z28

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2.8L 24v - A28 / Z28

Reduced price! Coussinets de bielles trimétal 56 mm Alfa Romeo 3.2 V6 Opel Saab View larger

Trimetal connecting rod bearings 56 mm Alfa Romeo 3.2 V6 Opel Saab

New product

Set of 12 trimetal connecting rod half-bearings for Alfa Romeo 3.2, Opel, Vauxhall, Saab and Daewoo V6 engines (Ø 56 mm).

  • Brand and treatment: ACL Race
  • Compatibility: Alfa Romeo 147, 159, Brera, GT, Spider; Opel and Vauxhall Signum, Vectra; Saab 9-3, 9-4X; Daewoo Adventra
  • Available sizes: standard, increased clearance HX, +0.025 and +0.25 mm

More details

142,81 € tax incl.

-5%

150,32 € tax incl.

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  • The Alfa Romeo, Opel, Vauxhall, Saab and Daewoo V6 engines from 2.8 to 3.6 litres

    These 2.8 to 3.6 litre V6 engines power the Alfa Romeo 147 GTA, 159, Brera, GT and Spider 3.2 JTS (939 A.000), the Opel Signum and Vectra C and the Vauxhall Signum and Vectra 2.8 V6 Turbo (Z 28 NEL, Z 28 NET), the Saab 9-3 2.8 Turbo V6 (LP9) and 9-4X (LF1, LP9), as well as the Daewoo Adventra 3.6 (LY7). The LP1 code also appears in the ACL application lists. 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 12 half shells, six pairs for a six-cylinder engine.

    Technical specifications

    Fitment dimensions common to all references
    ACL bearings
    Crankpin Ø 55.992 / 56.008 mm
    Housing bore Ø 59.620 / 59.636 mm
    Width 18.55 mm
    ReferenceBrand and treatmentSizeWall thickness (mm)
    6B2270H-STDACL Race - UntreatedStandard1.798
    6B2270HX-STDACL Race - UntreatedStd, increased clearance (HX)1.785
    6B2270H-.025ACL Race - Untreated+0.0251.811
    6B2270H-.25ACL Race - Untreated+0.251.923

    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 reground0.058 to 0.069 mm
    Increased clearance (HX)Wider clearance: high oil flow, high rpm0.083 to 0.094 mm
    +0.025 mmPolished journal0.058 to 0.069 mm
    +0.25 mmJournal reground to 0.25 mm0.058 to 0.069 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 V6 engines of the following Alfa Romeo, Opel, Vauxhall, Saab and Daewoo models:

    BrandModel (chassis)Engine codePowerYears
    ALFA ROMEO147 (937_) 3.2 GTA939 A.000260 hp2008–2010
    ALFA ROMEO159 (939_) 3.2 JTS / 3.2 JTS Q4939 A.000260 hp2005–2011
    ALFA ROMEO159 Sportwagon (939_) 3.2 JTS / 3.2 JTS Q4939 A.000260 hp2006–2011
    ALFA ROMEOBrera (939_) 3.2 JTS / 3.2 JTS Q4939 A.000260 hp2006–2011
    ALFA ROMEOGT (937_) 3.2 GTA939 A.000260 hp2008–2010
    ALFA ROMEOSpider (939_) 3.2 JTS / 3.2 JTS Q4939 A.000260 hp2006–2011
    DAEWOOAdventra 3.6 VVT AWDLY7258 hp2003–
    OPELSignum Berline à hayon (Z03) 2.8 V6 TurboZ28NEL, Z28NET230–250 hp2005–2008
    OPELVectra C (Z02) 2.8 V6 Turbo / 2.8 V6 Turbo OPCZ28NEL, Z28NET230–280 hp2005–2008
    OPELVectra C Break (Z02) 2.8 V6 TurboZ28NEL, Z28NET230–280 hp2005–2008
    OPELVectra C GTS (Z02) 2.8 V6 TurboZ28NEL, Z28NET230–280 hp2005–2008
    SAAB9-3 (YS3F, E79, D79, D75) 2.8 Turbo V6LP9230–250 hp2005–2015
    SAAB9-3 Break (E50) 2.8 Turbo V6LP9250 hp2005–2015
    SAAB9-3 Décapotable (YS3F) 2.8 Turbo V6LP9230–250 hp2006–2015
    SAAB9-4X 2.8 Turbo XWD / 3.0 XWD / 3.0LF1, LP9269–305 hp2011
    VAUXHALLSignum (Z03) 2.8 V6 TurboZ28NEL, Z28NET230–250 hp2005–2008
    VAUXHALLVectra Mk II (C) Break (Z02) 2.8 V6 TurboZ28NEL, Z28NET230–280 hp2005–2009
    VAUXHALLVectra Mk II (C) GTS (Z02) 2.8 V6 TurboZ28NEL, Z28NET230–280 hp2005–2009