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5.2L 40v - V10 FSI
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5.2L 40v - V10 FSI
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Set of 20 trimetal connecting rod half-bearings for the 5.2 FSI V10.
The 5.2 FSI V10 (5,204 cc, 40 valves, direct injection) powers the Audi R8 (coupé and Spyder), the C6-generation Audi S6 (BXA code) and the Lamborghini Gallardo and Huracán, in versions from 435 to 640 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.
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 20 half shells, ten pairs for a ten-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.
| King bearings Crankpin Ø 53.957 / 53.978 mm Housing bore Ø 56.80 / 56.82 mm Width 16.9 mm |
| Reference | Brand and treatment | Size | Wall thickness (mm) |
|---|---|---|---|
| CR227XPC | King Racing - pMaxKote | Standard | 1.402 |
| CR227XPC STDX | King Racing - pMaxKote | Std, increased clearance (STDX) | 1.389 |
| CR227XPC.026 | King Racing - pMaxKote | +0.026 | 1.415 |
| CR227XPC0.25 | King Racing - pMaxKote | +0.25 | 1.529 |
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 / grade | When to choose it | King XPC |
|---|---|---|
| Standard (STD) | Standard journal, not reground | 0.054 mm - 0.062 mm |
| Increased clearance (STDX) | Wider clearance: high oil flow, high rpm | 0.079 mm - 0.087 mm |
| +0.026 mm | Polished journal | 0.054 mm - 0.062 mm |
| +0.25 mm | Journal reground to 0.25 mm | 0.054 mm - 0.062 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.
The King 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.
 | King Engine Bearings, an Israeli manufacturer of high-performance engine bearings since the 1960s, offers with its pMax Black trimetal alloy bearings designed for heavy loads, with a pMaxKote coating available as an option (XPC version). |
| Criterion | King Racing |
| Cross-section |  |
| Type | High-performance trimetal bearing |
| Country of manufacture | Israel |
| Construction | Trimetal: steel back, copper layer, soft surface |
| Alloy | pMax Black (hardened copper-lead) |
| Protective coating | pMaxKote: polymer coating on the surface that limits wear when lubrication drops (start-ups, thin oil film). |
| Available sizes | Standard to +0.25 mm (+ increased clearance STDX) |
This connecting rod bearing set fits the 5.2 FSI V10 of the following vehicles:
| Brand | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| AUDI | R8 (422, 423) | BUJ, CMPA, CTPA, CTPB, CTYA | 525–570 hp | 2009–2015 |
| AUDI | R8 Spyder (427, 429) | BUJ, CMPA, CTPA, CTPB, CTYA | 525–570 hp | 2010–2015 |
| AUDI | R8 (4S3, 4SP) | CSPA, CSPB, DKAA, DKAB, DKAC, DMWA, DMWC | 540–620 hp | 2015– |
| AUDI | R8 Spyder (4S9, 4SR) | CSPA, CSPB, DKAA, DKAB, DKAC, DMWA | 540–620 hp | 2016– |
| AUDI | A6 C6 (4F2) S6 quattro | BXA | 435 hp | 2006–2011 |
| AUDI | A6 C6 Avant (4F5) S6 quattro | BXA | 435 hp | 2006–2011 |
| LAMBORGHINI | GALLARDO | CEH, CMPA | 551–578 hp | 2008– |
| LAMBORGHINI | GALLARDO SPYDER | CEH, CMPA | 551–578 hp | 2008– |
| LAMBORGHINI | HURACÁN | CSJB, DGFA, DGFB, DKB, DKBA | 580–640 hp | 2014– |
| LAMBORGHINI | HURACÁN SPYDER | BUJ, CSJB, DGFA, DGFB, DKB | 579–639 hp | 2015– |
