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Also such engines do not have hydraulic lifters. RB25DE NEO camshafts have duration 236/232 deg, lift 8.4/6.9 mm. Also RB25DE NEO has head with modified compression chambers, new camshafts and improved exhaust manifold. This engine is compliant with high ecological standards and it is equipped with new intake manifold with thin runners. In 1998, new engine model RB25DE NEO was designed specially for Nissan Skyline R34. Since 1995, ignition system, MAF, crankshaft position sensor and ECU were modified. The engine was applied for Nissan Skyline R33. Thanks to RB25DE the power increased to 190 HP at 6,400 RPM. Later, in 1993 (when Skyline R33 appeared), NVCS system was used on intake camshaft. These engines were installed on Nissan Skyline R32. Such RB25DE S1 (Series 1) developed 180 HP at 6,000 RPM. The early models (to 1993) were not equipped with variable valve timing system NVCS. Also it was equipped with crankshaft with piston stroke 71.7 mm, new connecting rods and pistons.Ĭylinder head had two camshafts with 4 valves per cylinder. RB25DE used cylinder block similar to RB20, but with cylinder diameter enlarged to 86 mm. It appeared in 1991 and replaced RB20DET. It is quite popular representative of RB series. Nissan RB25DET engine reliability, problems and repair Normal engine operating temperature, ☌ (F)