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2.5L 24v - RB25DET
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2.5L 24v - RB25DET
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Set of 12 trimetal connecting rod half-bearings for Nissan RB25DE, RB25DET, RB26DETT.
The RB25 and RB26 are the inline six-cylinder engines of Nissan's RB family, with twin overhead camshafts and 24 valves: the naturally aspirated RB25DE (2.5 litre), the turbocharged RB25DET (2.5 litre) and the twin-turbo RB26DETT (2.6 litre) fitted to the Skyline GT-R. They power the Skyline (R32, R33, R34), Laurel, Stagea, Cefiro, Cedric and Gloria. ACL and King list the same bearing set for these engines: a single set covers the family.
From the factory, this engine is fitted with standard production connecting rod 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 12 half shells, six pairs for a six-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.
| ACL / King bearings Crankpin Ø 47.956 / 47.974 mm (King : 47.955 / 47.973 mm) Housing bore Ø 51.000 / 51.013 mm (King : 51.001 / 51.013 mm) Width 17.1 mm (ACL), 17 mm (King) |
| Reference | Brand and treatment | Size | Wall thickness (mm) |
|---|---|---|---|
| 6B2960H-STD | ACL Race - Untreated | Standard | 1.503 |
| 6B2960HX-STD | ACL Race - Untreated | Std, increased clearance (HX) | 1.490 |
| 6B2960H-.025 | ACL Race - Untreated | +0.025 | 1.516 |
| 6B2960H-.25 | ACL Race - Untreated | +0.25 | 1.628 |
| 6B2960H-.50 | ACL Race - Untreated | +0.50 | 1.753 |
| 6B2960HC-STD | ACL Race - Calico CT-1 | Standard | |
| 6B2960HXC-STD | ACL Race - Calico CT-1 | Std, increased clearance (HX) | |
| 6B2960HC-.025 | ACL Race - Calico CT-1 | +0.025 | |
| 6B2960HC-.25 | ACL Race - Calico CT-1 | +0.25 | |
| CR6697XP | King Racing - Untreated | Standard | 1.504 |
| CR6697XP STDX | King Racing - Untreated | Std, increased clearance (STDX) | 1.491 |
| CR6697XP.026 | King Racing - Untreated | +0.026 | 1.517 |
| CR6697XP0.5 | King Racing - Untreated | +0.50 | 1.758 |
| CR6697XPC | King Racing - pMaxKote | Standard | 1.504 |
| CR6697XPC STDX | King Racing - pMaxKote | Std, increased clearance (STDX) | 1.491 |
| CR6697XPC.026 | King Racing - pMaxKote | +0.026 | 1.517 |
| CR6697XPC0.25 | King Racing - pMaxKote | +0.25 | 1.631 |
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 XP / XPC |
|---|---|---|---|
| Standard (STD) | Standard journal, not reground | 0.051 to 0.061 mm | 0.051 mm - 0.061 mm |
| Increased clearance (HX / STDX) | Wider clearance: high oil flow, high rpm | 0.077 to 0.086 mm | 0.077 mm - 0.086 mm |
| +0.025 / +0.026 mm | Polished journal | 0.051 to 0.061 mm | 0.051 mm - 0.061 mm |
| +0.25 mm | Journal reground to 0.25 mm | 0.051 to 0.061 mm | 0.051 mm - 0.061 mm |
| +0.50 mm | Journal reground to 0.50 mm | 0.051 to 0.061 mm | 0.051 mm - 0.061 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.
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. Its Calico version (HC suffix) adds the CT-1 coating, a dry film lubricant that reduces friction and abrasive wear. |
 | 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 available as an option (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 (optional, XPC 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 connecting rod bearing set fits the RB25DE, RB25DET and RB26DETT six-cylinder engines of the following Nissan models:
| Brand | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| NISSAN | GLORIA XI (Y34) 2.5 Turbo 4WD / 2.5 AWD (Y34) | RB25DET | 250–260 hp | 1999–2004 |
| NISSAN | LAUREL (C34) 2.5 i (GC34) / 2.5 4x4 (GNC34) | RB25DE | 190 hp | 1993–1997 |
| NISSAN | LAUREL (C34) 2.5 i Turbo (GC34, GCC34) / 2.5 i Turbo 4x4 (GNC34) | RB25DET | 234 hp | 1993–1997 |
| NISSAN | LAUREL (C35) 2.5 i (GC35) / 2.5 i 4x4 (GNC35) | RB25DE | 200 hp | 1997–2002 |
| NISSAN | LAUREL (C35) 2.5 i Turbo (GC35, GCC35) / 2.5 i Turbo 4x4 (GNC35) | RB25DET | 234–280 hp | 1997–2002 |
| NISSAN | LAUREL Saloon (C33) 2.5 i (EC33, ECC33) | RB25DE | 190 hp | 1991–1992 |
| NISSAN | SKYLINE (R32) 2.5 (ER32) | RB25DE | 179 hp | 1989–1993 |
| NISSAN | SKYLINE Coupé (R32) 2.5 (ECR32) | RB25DE | 179 hp | 1991–1993 |
| NISSAN | SKYLINE Coupé (R32) 2.6 Twin Turbo 4x4 (BNR32) | RB26DETT | 280 hp | 1989–1993 |
| NISSAN | SKYLINE (R33) 2.5 (ER33) / 2.5 4x4 (ENR33) | RB25DE | 190 hp | 1993–1998 |
| NISSAN | SKYLINE Coupé (R33) 2.5 (ER33) / 2.5 4x4 (ENR33) | RB25DE | 190 hp | 1993–1998 |
| NISSAN | SKYLINE Coupé (R33) 2.5 (ECR33) | RB25DET | 250 hp | 1994–2000 |
| NISSAN | SKYLINE Coupé (R33) 2.6 Twin Turbo 4x4 (BCNR33) | RB26DETT | 280 hp | 1994–1999 |
| NISSAN | SKYLINE (R34) 2.5 Turbo (ER34) / 2.5 | RB25DET | 254–280 hp | 1998–2006 |
| NISSAN | SKYLINE Coupé (R34) 2.5 Turbo (ER34) | RB25DET | 280 hp | 1998–2006 |
| NISSAN | SKYLINE Coupé (R34) 2.6 Turbo 4x4 (BNR34) | RB26DETT | 280–333 hp | 1999–2008 |
| NISSAN | STAGEA (WC34) 2.5 (WGC34) / 2.5 AWD (WGNC34) | RB25DE | 190 hp | 1996–2001 |
| NISSAN | STAGEA (WC34) 2.5 Turbo AWD (WGNC34) | RB25DET | 235 hp | 1996–2001 |
| NISSAN | STAGEA (WC34) 2.6 Twin Turbo (WGNC34) | RB26DETT | 280 hp | 1996–2001 |
| NISSAN | CEDRIC X (Y34) 2.5 Turbo 4WD (ENY34) / 2.5 AWD (ENY34) | RB25DET | 250–260 hp | 1999–2004 |
| NISSAN | CEFIRO I Saloon (A31) 2.5 (EA31) | RB25DE | 180 hp | 1992–1994 |
