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Discussion Starter #1
hi sorry for starting another thread but in rush to find out if the rb25det neo 1998 block is the same as my 1994 rb25det gtst. i was offered neo head with it but dont think that will work with my loom?? thanks
 

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Tiger Uppercut!
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633 Posts
Don't think it is. The neo engine is definetly different to the 33gtst

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Super Moderator
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8,969 Posts
Have a look here, https://en.wikipedia.org/wiki/Nissan_RB_engine

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. The NEO head featured solid lifters rather than hydraulic, revised camshafts, with on/off solenoid Variable VCT, used a hotter 82 °C thermostat, model-specific coil packs and a revised inlet manifold (the runner diameter is reduced from 50mm to 45mm to increase air velocity and low end torque) in particular the RB25DE NEO which had two inlets going into the inlet manifold. The combustion chamber of the head is smaller so GT-R spec connecting rods are used to compensate as well as model-specific pistons. The turbo received the larger OP6 turbine which some came with steel compressor and turbine wheels, where others had the nylon plastic compressor wheel and ceramic turbine wheel. Some also used an N1 type oil pump and had the oil pump drive collar on the crank revised to help cope with the breakage problems associated with fast, high revs. All in all they are quite a different engine in their own right - a culmination of 20 years of Nissan RB engine building rolled into one.
 
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