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ACL trimetal connecting rod bearings Nissan KA24E KA24DE

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Set of 8 trimetal connecting rod half-bearings for Nissan KA24DE and KA24E.

  • Brand and treatment: ACL Race
  • Compatibility: 240SX, 200SX, Altima, Bluebird, Navara
  • Engine codes: KA24DE, KA24E
  • Available sizes: standard to +0.25 mm, increased-clearance version (HX)

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  • The Nissan KA24E and KA24DE four-cylinder engines

    The KA24E is Nissan's 2.4-litre inline four with a single overhead camshaft and 12 valves; the KA24DE is its double overhead camshaft version. They are found in the 240SX, Altima, Bluebird and Navara pick-ups, among others. ACL lists the same bearing set for both engines: 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 49.961 / 49.974 mm
    Housing bore Ø 53.000 / 53.013 mm
    Width 20 mm
    ReferenceBrand and treatmentSizeWall thickness (mm)
    4B2746H-STDACL Race - UntreatedStandard1.505
    4B2746HX-STDACL Race - UntreatedStd, increased clearance (HX)1.492
    4B2746H-.025ACL Race - Untreated+0.0251.518
    4B2746H-.25ACL Race - Untreated+0.251.630

    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 reground0.053 to 0.063 mm
    Increased clearance (HX)Wider clearance: high oil flow, high rpm0.078 to 0.088 mm
    +0.025 mmPolished journal0.053 to 0.063 mm
    +0.25 mmJournal reground to 0.25 mm0.053 to 0.063 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 KA24E and KA24DE four-cylinder engines of the following Nissan models:

    BrandModel (chassis)Engine codePowerYears
    NISSAN200SX (S13) 2.4KA24DE158 hp1990–1993
    NISSAN200SX (S13) 2.4KA24E141 hp1988–1990
    NISSAN240SX Hatchback 2.4KA24DE158 hp1990–1993
    NISSAN240SX Hatchback 2.4KA24E141 hp1988–1990
    NISSAN240SX Convertible 2.4KA24DE158 hp1991–1994
    NISSAN240SX 2.4KA24DE150–156 hp1988–2001
    NISSAN240SX 2.4KA24E141 hp1988–1990
    NISSANALTIMA (L30) 2.4KA24DE152 hp1997–2001
    NISSANALTRA Estate (N30) 2.4KA24DE155 hp1997–2001
    NISSANATLAS II (F23, H41, H42) 2.4KA24E124 hp1995–2004
    NISSANBASSARA (JU30) 2.4 (JU30)KA24DE150 hp1999–2002
    NISSANBLUEBIRD (U13, U14) 2.4 iKA24DE152 hp1992–1997
    NISSANCARAVAN Bus (E25) 2.4 i (CGE25, CQGE25, DQGE25) / 2.4KA24DE140–141 hp2001–2012
    NISSANCARAVAN Van (E25) 2.4 i (CQGE25)KA24DE140 hp2001–2012
    NISSANGLORIA XI (Y34) 2.4KA24DE152 hp1999–2004
    NISSANHOMY Van (E24) 2.4KA24E120 hp1992–1995
    NISSANLARGO MPV (W30) 2.4 i AWD (NW30, NCW30) / 2.4 i (CW30)KA24DE116–146 hp1993–1999
    NISSANLEOPARD (Y33) 2.4KA24DE152 hp1995–2001
    NISSANLEOPARD Estate (Y33) 2.4KA24DE152 hp1995–2001
    NISSANNAVARA (D21) 2.4 4x4 / 2.4 i / 2.4 / 2.4 i 4x4KA24E124–143 hp1989–2008
    NISSANNAVARA (D22) 2.4 / 2.4 4x4 / 2.4 4WDKA24DE143–150 hp1997–2013
    NISSANNAVARA (D22) 2.4 / 2.4 4x4KA24E107–126 hp1997–2003
    NISSANNAVARA Platform/Chassis (D21) 2.4 i / 2.4 i 4x4KA24E126 hp1992–1997
    NISSANNAVARA Platform/Chassis (D22) 2.4 i / 2.4 / 2.4 4WDKA24DE126–150 hpsince 1997
    NISSANNAVARA Platform/Chassis (D22) 2.4 i / 2.4 i 4WDKA24E126 hp1997–1999
    NISSANNAVARA NP300 (D40) 2.4 / 2.4 4WDKA24DE146–150 hpsince 2004
    NISSANNP300 PICKUP (D22) 2.4 4x4 / 2.4KA24DE143 hpsince 2008
    NISSANPICK UP (D21) 2.4 i 12V / 2.4 i 12V 4WD / 2.4 / 2.4 4WDKA24E124–140 hp1992–1998
    NISSANPICK UP (D22) 2.4 i 4WD / 2.4 / 2.4 4WDKA24DE126–150 hpsince 1997
    NISSANPICK UP (D22) 2.4 i 4WD / 2.4 i / 2.4KA24E118–120 hp1998–2005
    NISSANPINTARA Hatchback (U12) 2.4 iKA24E131 hp1990–1992
    NISSANPINTARA Saloon (U12) 2.4 iKA24E131 hp1989–1992
    NISSANPRAIRIE PRO (M11) 2.4 i / 2.4 i 4x4 / 2.4 / 2.4 4x4KA24E133–140 hp1989–1994
    NISSANPRESAGE (U30) 2.4 (U30) / 2.4 4WD (NU30)KA24DE150 hp1998–2002
    NISSANR'NESSA (N30) 2.4 4WD (PNN30)KA24DE155 hp1997–2001
    NISSANSERENA (C23) 2.4KA24E126 hp1994–2000
    NISSANSTANZA Saloon (U12) 2.4KA24E140 hp1989–1992
    NISSANTERRANO II (R20) 2.4 i 12V 4WD / 2.4 4WDKA24E116–124 hp1993–2007
    NISSANURVAN Bus (E24) 2.4KA24DE140 hp2001–2010
    NISSANXTERRA (WD22_) 2.4 4WD / 2.4KA24DE143–146 hp1999–2004