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
2.0L 16v - 4U-GSE
Manufacturers
2.0L 16v - 4U-GSE
View larger Warning: Last items in stock!
New product
Set of 10 tri-metal crankshaft main bearing half shells for Subaru FA20 and Toyota 4U-GSE engines (Ø 68 mm).
The FA20 is Subaru's 2.0-litre, 16-valve flat-four (boxer) engine, called 4U-GSE at Toyota. It powers the Subaru BRZ (FA20D, FA20C) and the Toyota GT86 (FA20D, 4U-GSE). ACL and King list the same bearing set for these engines: a single set covers the family.
The crankshaft of these engines 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.
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 67.985 / 68.009 mm Housing bore Ø 73.000 / 73.016 mm Width 14.5 mm | King bearings Crankshaft journal Ø 67.985 / 68.009 mm Housing bore Ø 73.000 / 73.016 mm Width main bearings 1 and 3: 17.5 mm; main bearings 2 and 4: 14.4 mm; main bearing 5: 23.0 mm |
| Reference | Brand and treatment | Size | Wall thickness (mm) |
|---|---|---|---|
| 5M8312H-STD | ACL Race - Untreated | Standard | 2.505 |
| 5M8312HX-STD | ACL Race - Untreated | Std, increased clearance (HX) | 2.492 |
| 5M8312H-.025 | ACL Race - Untreated | +0.025 | |
| 5M8312H-.25 | ACL Race - Untreated | +0.25 | |
| 5M8312H-.50 | ACL Race - Untreated | +0.50 | |
| MB5745XPGC | King Racing - pMaxKote | Standard | 2.508 |
| MB5745XPGC STDX | King Racing - pMaxKote | Std, increased clearance (STDX) | 2.495 |
| MB5745XPGC.026 | King Racing - pMaxKote | +0.026 | 2.521 |
| MB5745XPGC0.25 | King Racing - pMaxKote | +0.25 | 2.635 |
| MB5745XPGC0.5 | King Racing - pMaxKote | +0.50 | 2.762 |
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 XPGC |
|---|---|---|---|
| Standard (STD) | Standard journal, not reground | 0.067 to 0.081 mm | 0.068 mm - 0.081 mm |
| Increased clearance (HX / STDX) | Wider clearance: high oil flow, high rpm | 0.093 to 0.106 mm | 0.093 mm - 0.106 mm |
| +0.025 / +0.026 mm | Polished journal | 0.067 to 0.081 mm | 0.068 mm - 0.081 mm |
| +0.25 mm | Journal reground to 0.25 mm | 0.067 to 0.081 mm | 0.068 mm - 0.081 mm |
| +0.50 mm | Journal reground to 0.50 mm | 0.067 to 0.081 mm | 0.068 mm - 0.081 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 (XPGC 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 (XPGC version): polymer coating on the surface that limits wear when lubrication drops (start-ups, thin oil film). |
| Available sizes | Standard to +0.50 mm (+ increased clearance HX) | Standard to +0.50 mm (+ increased clearance STDX) |
This main bearing set fits the following vehicles fitted with the Subaru FA20 and Toyota 4U-GSE engines:
| Brand | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| SUBARU | BRZ (ZC6) 2.0 (ZC6) | FA20D, FA20C | 200–208 hp | 2012– |
| TOYOTA | GT 86 Coupé (ZN6_) 2.0 (ZN6AC_, ZN6BC_, ZN6EY_, ZN6K, ZN6) | FA20D, FA20, 4U-GSE | 200–207 hp | 2012– |
