The 2.5-liter Nissan RB25DE engine was produced from 1991 to 2002 at a Japanese plant and was installed on such popular models as Skyline, Cefiro, Laurel, and Stage. The first models (until 1993) were not equipped with the NVCS variable valve timing system. Characteristics of camshafts on these engines: phase 240/232, rise 7.8/7.3 mm. Such RB25DE S1 (Series 1) developed 180 hp at 6000 rpm. Later, in 1993 (with the release of the Skyline R33), NVCS appeared on the intake shaft, and the exhaust cam was replaced with a 240, 7.8 mm lift. Power increased to 190 hp at 6400 rpm. Since 1995, the ignition system, maf, camshaft position sensor, engine control unit have been changed.
The 2.5-liter turbo engine Nissan RB25DET was produced from 1993 to 2004 and was put on models with a sporty character, such as Skyline, Gloria, Leopard and others. The first version (RB25DET S1) appeared in 1993, on a Nissan Skyline R33 car and differed from the usual RB25DE S1 in connecting rods, pistons for a compression ratio of 8.5, and the presence of a 45V1 turbocharger operating at a pressure of 0.5 bar. This version was equipped with a variable valve timing system on the NVCS intake camshaft, 370 cc / min injectors, and oil nozzles were installed in the cylinder block. Power 245-250 hp at 6400 rpm, torque 272 Nm at 4800 rpm. By analogy with the RB25DE, a restyling was carried out in 1995, during which the ignition system, maf, camshaft position sensor, and control unit were changed. The turbine was replaced by a 45V2, where a plastic impeller is used instead of a steel impeller. Such engines are called RB25DET S2.
Since about 1998, upgraded versions of these engines with the NEO prefix have been produced. Much has undergone modernization, in addition, such engines met increased environmental standards.
Specifications
| Production years | 1991-2002 (RB25DE) 1993-2004 (RB25DET) |
| Displacement, cc | 2498 |
| Fuel system | distributed injection |
| Power output, hp | 180 – 190 (RB25DE) 235 – 250 (RB25DET) |
| Torque output, Nm | 225 – 235 (RB25DE) 275 – 320 (RB25DET) |
| Cylinder block | cast iron R6 |
| Block head | aluminum 24v |
| Cylinder bore, mm | 86 |
| Piston stroke, mm | 71.7 |
| Compression ratio | 10 (RB25DE) 8.5 (RB25DET) |
| Features | no |
| Hydraulic lifters | yes |
| Timing drive | belt |
| Phase regulator | optional |
| Turbocharging | no (RB25DE) turbine 45V1 or 45V2 (RB25DET) |
| Recommended engine oil | 5W-30 |
| Engine oil capacity, liter | 4.6-4.7 |
| Fuel type | petrol |
| Euro standards | EURO 2/3 |
| Fuel consumption, L/100 km (for Nissan Skyline 1997) — city — highway — combined |
14.4 9.8 12.0 |
| Engine lifespan, km | ~400 000 |
| Weight, kg | 235 (RB25DE) 260 (RB25DET) |
Specifications of the NEO modification
| Displacement, cc | 2498 |
| Fuel system | distributed injection |
| Power output, hp | 200 (RB25DE) 280 (RB25DET) |
| Torque output, Nm | 255 (RB25DE) 335 – 365 (RB25DET) |
| Cylinder block | cast iron R6 |
| Block head | aluminum 24v |
| Cylinder bore, mm | 86 |
| Piston stroke, mm | 71.7 |
| Compression ratio | 10 (RB25DE) 9 (RB25DET) |
| Features | no |
| Hydraulic lifters | no |
| Timing drive | belt |
| Phase regulator | at the NVCS inlet |
| Turbocharging | no (RB25DE) turbine 45V3 or 45V4 (RB25DET) |
| Recommended engine oil | 5W-30 |
| Engine oil capacity, liter | 4.6-4.7 |
| Fuel type | 92 |
| Euro standards | EURO 3/4 |
| Engine lifespan, km | ~330 000 |
Disadvantages of the RB25 engine
- One of the most popular inline 6-cylinder engines is renowned for its excellent reliability;
- The main claim of owners to their engine is high fuel consumption;
- Ignition coils are not very durable, which causes tripping;
- Do not skip the timing belt replacement procedure, as when it breaks, the valve bends;
- The fuel system does not like bad gasoline, injectors become clogged very quickly.
