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2.0L 16v - 4B11T
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2.0L 16v - 4B11T
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Set of 10 tri-metal crankshaft main bearing half shells for Mitsubishi Lancer Evolution X and Ralliart 4B11T engines.
The 4B11T is the 2.0 litre turbocharged four-cylinder engine of Mitsubishi, with twin overhead camshafts and 16 valves. It powers the Mitsubishi Lancer Evolution X and the Lancer Ralliart. ACL and King list the same bearing set for this engine.
The crankshaft of this engine runs on five 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 contains 10 half shells, five pairs for five main bearings. 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 51.973 / 51.985 mm Housing bore Ø 56.000 / 56.018 mm Width 18 mm | King bearings Crankshaft journal Ø 51.97 / 51.98 mm Housing bore Ø 56.00 / 56.02 mm Width 18 mm |
| Reference | Brand and treatment | Size | Wall thickness (mm) |
|---|---|---|---|
| 5M1237H-STD | ACL Race - Untreated | Standard | 1.996 |
| 5M1237HX-STD | ACL Race - Untreated | Std, increased clearance (HX) | 1.983 |
| 5M1237H-.025 | ACL Race - Untreated | +0.025 | 2.0085 |
| 5M1237H-.25 | ACL Race - Untreated | +0.25 | 2.121 |
| MB5722XPC | King Racing - pMaxKote | Standard | 1.996 |
| MB5722XPC STDX | King Racing - pMaxKote | Std, increased clearance (STDX) | 1.983 |
| MB5722XPC.026 | King Racing - pMaxKote | +0.026 | 2.009 |
| MB5722XPC0.25 | King Racing - pMaxKote | +0.25 | 2.123 |
| MB5722XPC0.5 | King Racing - pMaxKote | +0.50 | 2.25 |
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 XPC |
|---|---|---|---|
| Standard (STD) | Standard journal, not reground | 0.055 to 0.065 mm | 0.052 mm - 0.065 mm |
| Increased clearance (HX / STDX) | Wider clearance: high oil flow, high rpm | 0.080 to 0.090 mm | 0.077 mm - 0.090 mm |
| +0.025 / +0.026 mm | Polished journal | 0.055 to 0.065 mm | 0.052 mm - 0.065 mm |
| +0.25 mm | Journal reground to 0.25 mm | 0.055 to 0.065 mm | 0.052 mm - 0.065 mm |
| +0.50 mm | Journal reground to 0.50 mm | 0.052 mm - 0.065 mm |
Check at assembly: lay a calibrated strip (Plastigauge) on the journal, tighten the main cap following the manufacturer's procedure, then compare the width of the crushed strip with the gauge to read the clearance.
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, with a pMaxKote coating (XPC version). |
| 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 | pMaxKote (XPC version): 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 HX) | Standard to +0.50 mm (+ increased clearance STDX) |
This main bearing set fits the Mitsubishi 4B11T four-cylinder engine of the following vehicles:
| Brand | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| Mitsubishi | Lancer VIII (CY_A, CZ_A) | 4B11T | 301 hp | 2008–2015 |
| Mitsubishi | Lancer VIII (CY_A, CZ_A) | 4B11T | 295 hp | 2008–2015 |
| Mitsubishi | Lancer VIII (CY_A, CZ_A) | 4B11T | 241 hp | 2008– |
| Mitsubishi | Lancer VIII (CY_A, CZ_A) | 4B11T | 340 hp | 2014–2015 |
| Mitsubishi | Lancer VIII (CY_A, CZ_A) | 4B11T | 307 hp | 2014–2015 |
| Mitsubishi | Lancer VIII (CY_A, CZ_A) | 4B11T | 313 hp | 2015–2016 |
| Mitsubishi | Lancer VIII (CY_A, CZ_A) | 4B11T | 280 hp | 2007–2008 |
| Mitsubishi | Lancer VIII (CY_A, CZ_A) | 4B11T | 409 hp | 2009–2010 |
| Mitsubishi | Lancer VIII (CY_A, CZ_A) | 4B11T | 446 hp | 2014 |
| Mitsubishi | Lancer VIII Sportback (CX_A) | 4B11T | 241 hp | 2008– |
| Mitsubishi | Lancer VIII Sportback (CX_A) | 4B11T | 250 hp | 2011– |
