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3.0L 12v - RB30 with RB25DET cylinder head
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3.0L 12v - RB30 with RB25DET cylinder head
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Set of 12 trimetal connecting rod half-bearings for Nissan RB30, VG30, VG33E and VE30DE.
The RB30 is Nissan's 3-litre inline six with a single overhead camshaft and 12 valves (RB30E, RB30S, RB30ET turbo). The VG30 engines are 3-litre V6 units, with a single overhead camshaft per bank on the VG30E, VG30ET and VG30i and double overhead camshafts and 24 valves on the VG30DE, VG30DET and VG30DETT; the VG33E is the 3.3-litre version and the VE30DE a 3-litre double overhead camshaft V6. ACL lists the same bearing set for all 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 bearings Crankpin Ø 49.961 / 49.974 mm Housing bore Ø 53.000 / 53.011 mm Width 17.1 mm |
| Reference | Brand and treatment | Size | Wall thickness (mm) |
|---|---|---|---|
| 6B2390H-STD | ACL Race - Untreated | Standard | 1.503 |
| 6B2390HX-STD | ACL Race - Untreated | Std, increased clearance (HX) | 1.490 |
| 6B2390H-.025 | ACL Race - Untreated | +0.025 | 1.516 |
| 6B2390H-.25 | ACL Race - Untreated | +0.25 | 1.628 |
| 6B2390H-.50 | ACL Race - Untreated | +0.50 | 1.753 |
| 6B2390HC-STD | ACL Race - Calico CT-1 | Standard | |
| 6B2390HXC-STD | ACL Race - Calico CT-1 | Std, increased clearance (HX) | |
| 6B2390HC-.025 | ACL Race - Calico CT-1 | +0.025 | |
| 6B2390HC-.25 | ACL Race - Calico CT-1 | +0.25 |
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 |
|---|---|---|
| Standard (STD) | Standard journal, not reground | 0.053 to 0.063 mm |
| Increased clearance (HX) | Wider clearance: high oil flow, high rpm | 0.078 to 0.088 mm |
| +0.025 mm | Polished journal | 0.053 to 0.063 mm |
| +0.25 mm | Journal reground to 0.25 mm | 0.053 to 0.063 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, then compare the crushed strip against the gauge to read the clearance.
The ACL 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. |
This connecting rod bearing set fits the RB30, VG30, VG33E and VE30DE engines of the following Nissan models:
| Brand | Model (chassis) | Engine code | Power | Years |
|---|---|---|---|---|
| NISSAN | 300ZX (Z31) | VG30E, VG30ET | 170–203 hp | 1984–1990 |
| NISSAN | 300ZX (Z32) | VG30DE, VG30DET, VG30DETT | 226–305 hp | 1989–1997 |
| NISSAN | 300ZX Coupé (Z31) | VG30E | 170 hp | 1984–1987 |
| NISSAN | 300ZX Convertible (Z32) | VG30DE | 226 hp | 1992–1996 |
| NISSAN | BLUEBIRD (U13, U14) | VG30E | 160 hp | 1991–1997 |
| NISSAN | CEDRIC (Y30) | VG30E | 150–179 hp | 1983–1988 |
| NISSAN | CEDRIC (Y32) | VG30DE, VG30E | 160–193 hp | 1991–1995 |
| NISSAN | CEDRIC Hardtop (Y31) | VG30E | 160 hp | 1987–1991 |
| NISSAN | CEDRIC WAGON (Y30) | VG30E | 160–180 hp | 1983–1997 |
| NISSAN | CIMA (Y31) | VG30DE, VG30DET | 203–258 hp | 1988–1991 |
| NISSAN | CIMA (Y32) | VG30DET | 256 hp | 1991–1996 |
| NISSAN | ELGRAND (E50) | VG33E | 170 hp | 1996–2002 |
| NISSAN | GLORIA (Y32) | VG30DE, VG30DET, VG30E | 160–254 hp | 1991–1997 |
| NISSAN | GLORIA Estate (Y30, Y31, Y32) | VG30E | 160–179 hp | 1984–1997 |
| NISSAN | GLORIA VII (Y30) | VG30E | 148–179 hp | 1983–1987 |
| NISSAN | GLORIA VIII (Y31) | VG30DE, VG30DET, VG30E | 160–254 hp | 1987–1995 |
| NISSAN | HOMY Van (E24) | VG30E | 160 hp | 1994–1997 |
| NISSAN | LEOPARD (Y32) | VG30E | 200 hp | 1991–1995 |
| NISSAN | LEOPARD (Y33) | VG30E | 160 hp | 1995–2001 |
| NISSAN | LEOPARD II Coupé (F31) | VG30DET | 185–254 hp | 1986–1991 |
| NISSAN | MAXIMA / MAXIMA QX IV (A32) | VG30DE | 193 hp | 1994–1999 |
| NISSAN | MAXIMA / MAXIMA QX V (A33) | VG30DE | 226 hp | 1999–2001 |
| NISSAN | MAXIMA II (PU11) | VG30E | 154–159 hp | 1984–1988 |
| NISSAN | MAXIMA II Estate (PU11) | VG30E | 159 hp | 1984–1988 |
| NISSAN | MAXIMA III (J30) | VE30DE, VG30E | 162–193 hp | 1988–1994 |
| NISSAN | NAVARA (D21) | VG30E | 140–155 hp | 1986–1997 |
| NISSAN | NAVARA (D22) | VG30E, VG33E | 163–170 hp | since 1997 |
| NISSAN | NAVARA Platform/Chassis (D21) | VG30E | 140–154 hp | 1985–1997 |
| NISSAN | NAVARA Platform/Chassis (D22) | VG30E | 163 hp | 2000–2004 |
| NISSAN | PATHFINDER I (WD21) | VG30E, VG30i | 129–155 hp | 1986–1995 |
| NISSAN | PATHFINDER II (R50) | VG33E | 150–170 hp | 1997–2004 |
| NISSAN | PATROL GR IV (Y60, GR) | RB30S | 136 hp | 1990–1997 |
| NISSAN | PATROL III/2 Hardtop (K260) | RB30S | 135–148 hp | 1989–1993 |
| NISSAN | PATROL III/2 Station Wagon (W260) | RB30S | 135–148 hp | 1989–1993 |
| NISSAN | PICK UP (D21) | VG30E | 152–170 hp | 1985–1997 |
| NISSAN | PICK UP (D22) | VG30E, VG33E | 163–170 hp | 1997–2007 |
| NISSAN | QUEST (V40) | VG30E | 154 hp | 1992–1998 |
| NISSAN | QUEST Mini Passenger Van | VG33E | 173 hp | 1998–2002 |
| NISSAN | SANI II (WD21) | VG30E | 163 hp | 1990–1999 |
| NISSAN | SILVIA (S12) | VG30E | 162 hp | 1986–1988 |
| NISSAN | SKYLINE (R31) | RB30E | 159 hp | 1986–1990 |
| NISSAN | SKYLINE Estate (R31) | RB30E | 159 hp | 1986–1990 |
| NISSAN | TERRANO I (WD21) | VG30E, VG30i | 129–148 hp | 1986–1995 |
| NISSAN | TERRANO II (R20) | VG33E | 170 hp | 1992–2004 |
| NISSAN | URVAN Bus (E24) | VG30E | 163 hp | 1995–2000 |
| NISSAN | XTERRA (WD22_) | VG33E | 170–182 hp | 1999–2004 |
