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1.8L 16v - 2ZZ-GE
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1.8L 16v - 2ZZ-GE
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Set of 10 tri-metal crankshaft main bearing half shells for Lotus and Toyota 2ZZ-GE engines (Ø 48 mm).
The 2ZZ-GE is a Toyota four-cylinder 1.8 litre 16-valve petrol engine (1796 cc), fitted to the Celica (T23), Corolla (E12) and Matrix (E13), as well as to the Lotus Elise, Exige and 2 Eleven. All the applications listed below share the same crankshaft journal and housing dimensions: a single bearing set covers the 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 trimetal bearing combines three layers with complementary roles: a steel back that provides structural strength, a copper-lead intermediate layer that takes the heavy loads and an anti-friction running layer that protects the main journal. The complete set contains 10 half shells, i.e. 5 pairs.
An aluminium bi-metal bearing, intended for low to medium loads, tops out at around 8,000 psi; a performance trimetal bearing holds up to 12,000 psi, 50% more load capacity. It therefore gains strength and service life on turbocharged, supercharged or high-revving engines.
| ACL bearings Crankshaft journal Ø 47.988 / 48.000 mm Housing bore Ø 52.000 / 52.016 mm Width 17 mm | King bearings Crankshaft journal Ø 47.988 / 47.998 mm Housing bore Ø 52.001 / 52.014 mm Width 16.9 mm |
| Reference | Brand and treatment | Size | Wall thickness (mm) |
|---|---|---|---|
| 5M1857H-STD | ACL Race - Untreated | Standard | 1.996 |
| 5M1857HX-STD | ACL Race - Untreated | Std, increased clearance (HX) | 1.983 |
| 5M1857H-.025 | ACL Race - Untreated | +0.025 | |
| 5M1857H-.25 | ACL Race - Untreated | +0.25 | |
| MB5375XP | King Racing - Untreated | Standard | 2.000 |
| MB5375XP STDX | King Racing - Untreated | Std, increased clearance (STDX) | 1.987 |
| MB5375XP0.25 | King Racing - Untreated | +0.25 | 2.127 |
| MB5375XP0.5 | King Racing - Untreated | +0.50 | 2.254 |
Running clearance is the space left between the bearing and the main journal, permanently filled by the oil film.
With the engine running, the main journal does not touch the bearing: it rides on this oil film, which takes the load. The clearance sets the film thickness. Too small, it restricts oil flow, raises the temperature and invites seizure; too large, it lets the oil escape, the film loses its load capacity and oil pressure falls. The right clearance combines sufficient lubrication with an oil film that keeps carrying the load.
| Size / grade | When to choose it | ACL Race Series | King XP |
|---|---|---|---|
| Standard (STD) | Standard journal, not reground | 0.051 to 0.061 mm | 0.048 mm - 0.061 mm |
| Increased clearance (HX / STDX) | Wider clearance: high oil flow, high rpm | 0.077 to 0.086 mm | 0.073 mm - 0.086 mm |
| +0.025 mm | Polished journal | 0.051 to 0.061 mm | |
| +0.25 mm | Journal reground to 0.25 mm | 0.051 to 0.061 mm | 0.048 mm - 0.061 mm |
| +0.50 mm | Journal reground to 0.50 mm | 0.048 mm - 0.061 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 built for engine tuning and racing. They withstand far higher loads than a standard bearing and come in several sizes: the standard size, a +0.025 mm size for a main journal that has only been polished, +0.25 and +0.50 mm regrind sizes and the HX / STDX version with increased clearance for high-revving engines or engines needing a high oil flow. This range lets you refit a reground crankshaft without changing product line and match the clearance to the oil and use chosen.
 | Founded in Australia in 1949, ACL Bearing Company designs high-performance engine bearings. Its Race Series brings together precision trimetal bearings, offered in a wide choice of sizes and fitted to built engines around the world. |
 | An Israeli maker of high-performance engine bearings since the 1960s, King Engine Bearings developed the pMax Black trimetal alloy 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 +0.25 mm (+ increased clearance HX) | Standard to +0.50 mm (+ increased clearance STDX) |
This main bearing set fits the following vehicles fitted with the 2ZZ-GE engine:
| Brand | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| Lotus | 2 Eleven | 2ZZ-GE | 193–256 hp | 2007–2011 |
| Lotus | Elise | 2ZZ-GE | 160–223 hp | 2002– |
| Lotus | Exige (SCC_) | 2ZZ-GE | 180–275 hp | 2000–2012 |
| Pontiac | Vibe Estate | 2ZZ-GE | 182 hp | 2002–2006 |
| Toyota | Celica Coupe (_T23_) | 2ZZ-GE | 182–192 hp | 1999–2005 |
| Toyota | Corolla (_E12_) | 2ZZ-GE | 190–224 hp | 2001–2007 |
| Toyota | Corolla Saloon (_E12_) | 2ZZ-GE | 173 hp | 2004–2006 |
| Toyota | Corolla Estate (_E12_) | 2ZZ-GE | 190 hp | 2001–2006 |
| Toyota | Matrix (_E13_) | 2ZZ-GE | 166–190 hp | 2002–2006 |
| Toyota | Will VS I (_E12_) | 2ZZ-GE | 190 hp | 2001–2004 |
A failing main bearing does not fail alone: it scores the main journal, sends debris through the oil circuit and calls at least for a crankshaft regrind, when it does not damage the block as well. On a built engine, a bearing set costs only a fraction of a regrind, and even less of a full rebuild: it is the cheapest part of the crankshaft assembly and the one whose failure costs the most.
