AUDI R8

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AUDI R8

Reduced price! Coussinets bielles trimétal AUDI R8 V8 4.2 32V BYH CNDA View larger

Trimetal connecting rod bearings King Audi R8 RS4 RS5 S5 Q7 A6 A8 V8 4.2 FSI

New product

Set of 16 trimetal connecting rod half-bearings for the 4.2 FSI V8.

  • Brand and treatment: King Racing pMaxKote
  • Compatibility: Audi R8, RS4, RS5, S5, Q7, A6 (C6), A6 Allroad and A8
  • Engine codes: BAR, BNS, BVJ, BYH, CAUA, CDRA, CFSA, CNDA
  • Available sizes: standard to +0.25 mm, increased clearance (STDX)

More details

363,25 € tax incl.

-5%

382,37 € tax incl.

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  • The Audi 4.2 FSI V8

    The 4.2 FSI V8 (4,163 cc, 32 valves, direct injection) powers the Audi R8 (coupé and Spyder), the Audi RS4 and RS5, the Audi S5, as well as the Q7, A6, A6 Allroad and A8 in 4.2 FSI versions, in versions from 350 to 450 hp. A single King bearing set covers the whole family.

    From the factory, these engines use standard connecting rod bearings sized for the loads of the original engine: as soon as power or engine speed increase, they reach their limits.

    Trimetal connecting rod bearings

    In a trimetal bearing, a steel back carries a copper-lead intermediate layer with high load capacity, itself covered by an anti-friction running layer that spares the crankpin. The set is supplied complete: 16 half shells, i.e. 8 pairs.

    Trimetal targets high, sustained loads, whereas aluminium bi-metal is limited to low to medium loads: about 8,000 psi for the latter, up to 12,000 psi for a performance trimetal, 50% more. The benefit shows in strength and durability on turbo, supercharged and high-revving engines.

    Technical specifications

    Fitment dimensions common to all references
    King bearings
    Crankpin Ø 53.957 / 53.978 mm
    Housing bore Ø 56.80 / 56.82 mm
    Width 16.9 mm
    ReferenceBrand and treatmentSizeWall thickness (mm)
    CR227XPCKing Racing - pMaxKoteStandard1.402
    CR227XPC STDXKing Racing - pMaxKoteStd, increased clearance (STDX)1.389
    CR227XPC.026King Racing - pMaxKote+0.0261.415
    CR227XPC0.25King Racing - pMaxKote+0.251.529

    Running clearance

    Running clearance is the gap between the bearing and the crankpin, filled by the oil film.

    While the engine turns, the crankpin floats on this oil film, which carries the load without direct contact with the bearing. Film thickness depends on clearance: too tight, oil passes poorly, temperature rises and the risk of seizure grows; too wide, oil escapes, the film carries less and oil pressure decreases. A correct clearance ensures both sufficient lubrication and a well-maintained film.

    Size / gradeWhen to choose itKing XPC
    Standard (STD)Standard journal, not reground0.054 mm - 0.069 mm
    Increased clearance (STDX)Wider clearance: high oil flow, high rpm0.079 mm - 0.094 mm
    +0.026 mmPolished journal0.054 mm - 0.069 mm
    +0.25 mmJournal reground to 0.25 mm0.054 mm - 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

    These King trimetal connecting rod bearings are aimed at built engines and racing: where a standard bearing quickly reaches its limit, they accept more power, more rpm and more boost. The range includes the standard size, a +0.026 mm size for a crankpin that has only been polished, a +0.25 mm regrind size and the STDX version with increased clearance for high-revving engines or engines needing a high oil flow. It allows the same part number to be kept after the crankshaft is reground and the clearance to be tailored to the oil used and the engine's duty.

    The brand

    King RacingSince the 1960s, Israel's King Engine Bearings has built high-performance engine bearings; its pMax Black trimetal alloy bearings are sized for heavy loads, with the pMaxKote coating available as an option (XPC version).

    Construction and advantages

    CriterionKing Racing
    Cross-sectionCross-section of a King Racing trimetal bearing
    TypeHigh-performance trimetal bearing
    Country of manufactureIsrael
    ConstructionTrimetal: steel back, copper layer, soft surface
    AlloypMax Black (hardened copper-lead)
    Protective coatingpMaxKote: polymer coating on the surface that limits wear when lubrication drops (start-ups, thin oil film).
    Available sizesStandard to +0.25 mm (+ increased clearance STDX)

    Vehicle compatibility

    This connecting rod bearing set fits the 4.2 FSI V8 of the following vehicles:

    BrandModel (chassis)Engine codePowerYears
    AUDIR8 (422, 423)BYH, CNDA420–430 hp2007–2015
    AUDIR8 Spyder (427, 429)CNDA430 hp2010–2015
    AUDIA5 (8T3) S5 quattroCAUA354 hp2007–2012
    AUDIA5 (8T3) RS5 quattroCFSA450 hp2010–2017
    AUDIA5 Décapotable (8F7) RS5 quattroCFSA450 hp2012–2015
    AUDIA4 B7 (8EC) RS4 quattroBNS420 hp2005–2008
    AUDIA4 B7 Avant (8ED) RS4 quattroBNS420 hp2005–2008
    AUDIA4 B7 Décapotable (8HE) RS4 quattroBNS420 hp2006–2008
    AUDIA4 B8 Avant (8K5) RS4 quattroCFSA450 hp2012–2015
    AUDIQ7 (4LB) 4.2 FSI quattroBAR350 hp2006–2010
    AUDIA6 C6 (4F2) 4.2 FSI quattroBVJ350 hp2006–2011
    AUDIA6 C6 Avant (4F5) 4.2 FSI quattroBVJ350 hp2006–2011
    AUDIA6 Allroad C6 (4FH) 4.2 FSI quattroBVJ350 hp2006–2010
    AUDIA8 D3 (4E2, 4E8) 4.2 FSI quattroBVJ350 hp2006–2010
    AUDIA8 D4 (4H2, 4H8, 4HC, 4HL) 4.2 FSI quattroCDRA371 hp2009–2012

    Why replace the bearings

    Replacing the bearings during a build or rebuild guards against the most expensive failure: a worn-out connecting rod bearing scores the crankpin, contaminates the oil circuit with debris and forces at least a crankshaft regrind, or even a new rod and block. Against such costs a new set weighs little: it is the cheapest part of the rotating assembly, but the one whose failure costs the most.