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2.0L 16v - N20B20
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2.0L 16v - N20B20
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Set of 8 trimetal connecting rod half-bearings for BMW N20B20 N26B20.
The N20 is BMW's 2.0-litre turbocharged four-cylinder petrol engine, built from 2011 to 2017: aluminium block, double overhead camshafts, 16 valves, direct injection, Valvetronic variable valve lift and a twin-scroll turbocharger. With an 84 mm bore and a 90.1 mm stroke, it produces 156 to 245 hp depending on the version. The N26 is its low-emission (SULEV) version for the North American market, with the same connecting rod bearings.
From the factory, BMW fits this engine with connecting rod bearings graded by colour class (part numbers 11 24 7 576 714 yellow, 11 24 7 576 715 violet, 11 24 7 628 034 red and 11 24 7 628 035 blue), selected according to the machining tolerances of the crankpin. These are standard production bearings, sized for the loads of the original engine: as soon as power, engine speed or boost pressure 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 8 half shells, four pairs for a four-cylinder engine. On the King side, the complete set is made up of 2 CR222GPC boxes of 2 pairs.
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.
| ACL / King bearings Crankpin Ø 49.973 / 49.993 mm Housing bore Ø 53.600 / 53.616 mm Width 17.55 / 17.5 mm | OEM reference Part no. 11 24 7 576 714 (yellow), 576 715 (violet) 628 034 (red) and 628 035 (blue) |
| Reference | Brand and treatment | Size | Wall thickness (mm) |
|---|---|---|---|
| 4B1584H-STD | ACL Race - Untreated | Standard | 1.793 |
| 4B1584HX-STD | ACL Race - Untreated | Std, increased clearance (HX) | 1.780 |
| 4B1584H-.025 | ACL Race - Untreated | +0.025 | 1.806 |
| 4B1584H-.25 | ACL Race - Untreated | +0.25 | 1.918 |
| 4B1584H-.50 | ACL Race - Untreated | +0.50 | 2.043 |
| CR222GPC | King GPC - Polymer coating | Standard | 1.788 |
| CR222GPC STDX | King GPC - Polymer coating | Std, increased clearance (STDX) | 1.775 |
| CR222GPC.026 | King GPC - Polymer coating | +0.026 | 1.801 |
| CR222GPC0.25 | King GPC - Polymer coating | +0.25 | 1.915 |
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 GPC |
|---|---|---|---|
| Standard (STD) | Standard journal, not reground | 0.053 to 0.063 mm | 0.050 mm - 0.071 mm |
| Increased clearance (HX / STDX) | Wider clearance: high oil flow, high rpm | 0.078 to 0.088 mm | 0.075 mm - 0.096 mm |
| +0.025 / +0.026 mm | Polished journal | 0.053 to 0.063 mm | 0.050 mm - 0.071 mm |
| +0.25 mm | Journal reground to 0.25 mm | 0.053 to 0.063 mm | 0.050 mm - 0.071 mm |
| +0.50 mm | Journal reground to 0.50 mm | 0.053 to 0.063 mm |
Checking on assembly: lay a calibrated strip (Plastigauge) on the journal, torque the rod 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) |
| Forged rod, ARP2000 (3/8″ × 38 mm) | 61 Nm | 0.140 to 0.152 mm |
ARP recommends the stretch method (gauge).
The ACL and 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.
 | ACL 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. |
 | King Engine Bearings, an Israeli manufacturer of high-performance engine bearings since the 1960s, offers with its GPC range a silver-based tri-metal: steel back, lead-bronze intermediate layer and a silver-based overlay containing solid lubricant particles. Its 10-micron polymer coating protects the bearing in case of oil starvation or metal-to-metal contact. |
| 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 | Tri-metal: steel back, lead bronze, silver-based overlay |
| Alloy | Race Series (copper-lead) | GPC (silver, solid lubricant) |
| Protective coating | No | Yes: 10 µm polymer |
| Available sizes | Standard to +0.50 mm (+ increased clearance HX) | Standard to +0.25 mm (+ increased clearance STDX) |
This connecting rod bearing set fits the BMW N20B20 and N26B20 four-cylinder engines:
| Brand | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| BMW | 1 Series (F20) | N20B20 | 184–238 hp | 2012–2017 |
| BMW | 1 Series (F21) | N20B20 | 218–238 hp | 2011–2019 |
| BMW | 2 Series Coupé (F22, F87) | N20B20, N26B20 | 184–245 hp | 2013–2021 |
| BMW | 2 Series Convertible (F23) | N20B20 | 184–245 hp | 2014–2021 |
| BMW | 3 Series (F30, F80) | N20B20, N26B20 | 182–245 hp | 2011–2018 |
| BMW | 3 Series Touring (F31) | N20B20, N26B20 | 163–245 hp | 2012–2016 |
| BMW | 3 Series Gran Turismo (F34) | N20B20, N26B20 | 163–245 hp | 2012–2016 |
| BMW | 4 Series Coupé (F32, F82) | N20B20, N26B20 | 163–245 hp | 2013–2017 |
| BMW | 4 Series Convertible (F33, F83) | N20B20, N26B20 | 163–245 hp | 2013–2017 |
| BMW | 4 Series Gran Coupé (F36) | N20B20, N26B20 | 163–245 hp | 2014–2017 |
| BMW | 5 Series (F10) | N20B20 | 163–245 hp | 2011–2016 |
| BMW | 5 Series Touring (F11) | N20B20 | 163–245 hp | 2010–2017 |
| BMW | 5 Series Gran Turismo (F07) | N20B20 | 245 hp | 2013–2017 |
| BMW | X1 (E84) | N20B20 | 184–245 hp | 2011–2015 |
| BMW | X3 (F25) | N20B20 | 184–245 hp | 2011–2017 |
| BMW | X4 (F26) | N20B20 | 184–245 hp | 2014–2018 |
| BMW | X5 (F15, F85) | N20B20 | 245–313 hp | 2015–2018 |
| BMW | X6 (F16, F86) | N20B20 | 245 hp | 2015–2019 |
| BMW | Z4 Roadster (E89) | N20B20 | 156–245 hp | 2011–2016 |
