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BMW M6 E63/E64 V10 507hp S85B50 2005-2010
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BMW M6 E63/E64 V10 507hp S85B50 2005-2010
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Set of tri-metal crankshaft main bearing half shells for the six main bearings of the BMW S85B50 V10.
Designed by the M division for the BMW M5 E60 and E61 and the M6 E63 and E64, the S85B50 is a naturally aspirated 4,999 cc V10 with a 92 mm bore, a 75.2 mm stroke and 40 valves, producing 507 hp. It was built from 2004 to 2010.
The crankshaft of these engines runs on six main bearings. Each journal turns between two half shells, one seated in the block and the other in the main bearing cap: they carry the crankshaft. The ACL Race Series and KING RACING tri-metal sets shown here replace them on built engines.
A tri-metal 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 covers the six main bearings of the crankshaft; on the King side it is one MB637XP box of 6 pairs. The upper and lower half shells are different: each goes in its own position.
An aluminium bi-metal takes around 8,000 psi, a performance tri-metal up to 12,000 psi, 50% more. Hence better resistance and better durability on turbocharged, supercharged and high-revving engines.
| ACL bearings Crankshaft journal Ø 59.971 / 59.990 mm Housing bore Ø 65.000 / 65.019 mm Width 21.9 mm (plain bearings) and 27.95 mm (flanged bearing) | King bearings Crankshaft journal Ø 59.970 / 59.980 mm Housing bore Ø 65.000 / 65.019 mm Width 21.8 mm (5 bearings) and 27.5 mm (1 bearing) |
| Reference | Brand and treatment | Size | Wall thickness (mm) |
|---|---|---|---|
| 6M1581H-STD | ACL Race - Untreated | Standard | 2.500 |
| 6M1581HX-STD | ACL Race - Untreated | Std, increased clearance (HX) | 2.487 |
| 6M1581H-.025 | ACL Race - Untreated | +0.025 | 2.513 |
| 6M1581H-.25 | ACL Race - Untreated | +0.25 | 2.625 |
| 6M1581H-.50 | ACL Race - Untreated | +0.50 | 2.750 |
| MB 637XP | King Racing - Untreated | Standard | 2.496 |
| MB 637XP STDX | King Racing - Untreated | Std, increased clearance (STDX) | 2.483 |
| MB 637XP.026 | King Racing - Untreated | +0.026 | 2.509 |
| MB 637XP0.25 | King Racing - Untreated | +0.25 | 2.623 |
| MB 637XP0.5 | King Racing - Untreated | +0.50 | 2.750 |
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 | ACL Race Series | King XP |
|---|---|---|---|
| Standard (STD) | Standard journal, not reground | 0.061 to 0.073 mm | 0.060 mm - 0.073 mm |
| Increased clearance (HX / STDX) | Wider clearance: high oil flow, high rpm | 0.086 to 0.098 mm | 0.085 mm - 0.098 mm |
| +0.025 / +0.026 mm | Polished journal | 0.061 to 0.073 mm | 0.060 mm - 0.073 mm |
| +0.25 mm | Journal reground to 0.25 mm | 0.061 to 0.073 mm | 0.060 mm - 0.073 mm |
| +0.50 mm | Journal reground to 0.50 mm | 0.061 to 0.073 mm | 0.060 mm - 0.073 mm |
Checking on assembly: lay a calibrated strip (Plastigauge) on the journal, torque the main cap to spec (see the torque table below), then compare the crushed strip against the gauge to read the clearance.
| Bolts | By torque | By stretch (gauge) |
| Original bolts (OEM), S85B50 | 30 Nm + 130°, repeated 3 times (new bolts) |
The ACL and King main 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.
 | ACL Bearing Company, an Australian manufacturer of high-performance engine bearings since 1949, offers with its Race Series precise tri-metal bearings, available in many sizes and proven on built engines worldwide. |
 | King Engine Bearings, an Israeli manufacturer of high-performance engine bearings since the 1960s, offers with its pMax Black tri-metal alloy bearings designed for heavy loads. |
| Criterion | ACL Race Series | King Racing |
| Cross-section |  |  |
| Type | High-performance trimetal bearing | High-performance trimetal bearing |
| Country of manufacture | Australia | Israel |
| Construction | Trimetal: steel back, copper layer, soft surface | Trimetal: steel back, copper layer, soft surface |
| Alloy | Race Series (copper-lead) | pMax Black (hardened copper-lead) |
| Protective coating | No | No |
| Available sizes | Standard to +0.50 mm (+ increased clearance HX) | Standard to +0.50 mm (+ increased clearance STDX) |
This main bearing set fits the BMW S85B50 V10 of the M5 E60 and E61 and M6 E63 and E64:
| Brand | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| BMW | 5 Series (E60) M5 | S85B50 | 507 hp | 2004–2009 |
| BMW | 5 Series Touring (E61) M5 | S85B50 | 507 hp | 2007–2010 |
| BMW | 6 Series Coupé (E63) M6 | S85B50 | 507 hp | 2005–2010 |
| BMW | 6 Series Convertible (E64) M6 | S85B50 | 507 hp | 2006–2010 |
