![]() ![]() The RB26DETT engine is a 2.6L Inline-6 engine manufactured by Nissan, for use primarily in the 1989-2002 Nissan Skyline GT-R. RB25DET NEO Camshaft duration 236°in, 232°ex lift: 8.4mm in, 8.7mm ex RB26DETT RB25DE NEO Camshaft duration 236°in, 232°ex lift: 8.4mm in, 6.9mm ex RB25DET Camshaft duration 240°in, 240°ex lift: 7.8mm in, 7.8mm ex R33 Skyline RB25DE Camshaft duration 240°in, 240°ex lift: 7.8mm in, 7.8mm ex ![]() R32 Skyline RB25DE Camshaft duration 240°in, 232°ex lift: 7.8mm in, 7.3mm ex Early R34 Skylines use the non NEO RB, later models use the NEO version. The non-VCT, non-turbo RB25DE was fitted to the R32 Skyline, the VCT turbo and non-turbo was fitted to R33 Skylines and the WC34 Stagea. The turbo received the larger OP6 turbine. The combustion chamber of the head is smaller, so GT-R spec connecting rods are used to compensate. The NEO head featured solid lifters rather than hydraulic, revised camshafts and a revised inlet manifold, in particular the RB25DE NEO which had 2 inlets going into the inlet manifold. ![]() In May 1998 a NEO head was fitted, which enabled the engine to be classified as a low emission vehicle ( LEV) engine due to their lower fuel consumption and emission output. Mechanically series 1 and series 2 are exactly the same. Other changes were, different air flow meter, engine ecu, cam angle sensor and throttle position sensor. The most obvious change to the system was the introduction of ignition coils with built in ignitors, therefore the coil ignitor that was on previous models was not used. Generally these engines are referred to as Series 2 engines. From 1995, both the RB25DE and RB25DET had a revised electrical system and the turbo charger on the RB25DET had a plastic compressor wheel rather than aluminium. This gave the new RB25DE more power and torque at lower rpm than the previous model. RB25DE and DET engines produced from August 1993 also featured NVCS (Nissan Variable Cam System) for the intake cam. The 2.5 L RB25 engine was produced in four forms: RB20DET Red top Camshaft duration 248°in, 240°ex lift: 7.8mm in, 7.8mm ex The Z31 200ZR was fitted with an intercooled NICS type RB20DET. The RB20E was also fitted to some Holden Commodores (the VL Commodore) sold in New Zealand, and also to the A31 Cefiro and C33 Laurel. Later versions which used ECCS engine management, discarded the twelve tiny runners for six much larger ones (though they retained twelve ports on the head, so there was a splitter plate). The early twin cam engines featured the NICS (Nissan Induction Control System) injection system, while the later twin cam engines used ECCS (Electronically Controlled Combustion System). The early twin cam engines are generally referred to as 'Red Top' engines because they have red cam covers. The first RB20E/ET/DE/DET engines were fitted to the HR31 Skyline. m NEO RB20DE - twin-cam 155 PS, improved low end torque, reduced fuel consumption and emissions.m RB20DET-R - twin-cam turbocharged (210 ps and 245 N.There were a variety of 2.0 L RB20 engines produced: "TT" indicates the engine has factory installed twin turbochargers."T" indicates the engine has a factory installed turbocharger."S" indicates the engine is carburetted."E" indicates the engine is electronically fuel-injected."D" indicates a dual overhead cam as opposed to a single overhead cam.All Nissan engines follow a naming convention, identifying the engine family (in this case, RB), displacement, and features present- see the list of Nissan engines for detail. ![]()
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