Product successfully added to your shopping cart
Quantity
Total
There are 0 items in your cart. There is 1 item in your cart.
Total products
Total shipping To be determined
Total
4.4L 32v - S63B44
Manufacturers
4.4L 32v - S63B44
Warning: Last items in stock!
New product
Set of 16 trimetal connecting rod half-bearings for the S63B44 V8 engine.
The BMW S63B44 V8 engine, of 4.4 litres with 32 valves, powers the X5 (E70) and the X6 (E71, E72) up to 2011. This King bearing set is intended for this engine only.
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 16 half shells, eight pairs for an eight-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 53.97 / 53.99 mm Housing bore Ø 57.60 / 57.61 mm Width 14.8 mm |
| Reference | Brand and treatment | Size | Wall thickness (mm) |
|---|---|---|---|
| CR8049GPC | King Racing - pMaxKote | Standard | 1.796 |
| CR8049GPC STDX | King Racing - pMaxKote | Std, increased clearance (STDX) | 1.783 |
| CR8049GPC.026 | King Racing - pMaxKote | +0.026 | 1.809 |
| CR8049GPC0.25 | King Racing - pMaxKote | +0.25 | 1.923 |
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 GPC |
|---|---|---|
| Standard (STD) | Standard journal, not reground | 0.054 mm - 0.070 mm |
| Increased clearance (STDX) | Wider clearance: high oil flow, high rpm | 0.079 mm - 0.095 mm |
| +0.026 mm | Polished journal | 0.054 mm - 0.070 mm |
| +0.25 mm | Journal reground to 0.25 mm | 0.054 mm - 0.070 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. |
| 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 V8 engines of the following vehicles:
| Brand | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| BMW | X5 (E70) | S63B44A | 2009–2011 | |
| BMW | X6 (E71, E72) | S63B44A |
