RB Engine's

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The stock dimensions for the RB engines:
RB20 - 2.0 L (1998 cc, bore: 78.0 mm, stroke: 69.7 mm)
RB24 - 2.4 L (2428 cc, bore: 86.0 mm, stroke: 69.7 mm)
RB25 - 2.5 L (2498 cc, bore: 86.0 mm, stroke: 71.7 mm)
RB26 - 2.6 L (2568 cc, bore: 86.0 mm, stroke: 73.7 mm)
RB30 - 3.0 L (2982 cc, bore: 86.0 mm, stroke: 85.0 mm)
"D" indicates a double overhead cam as opposed to a single overhead cam
"E" indicates the engine is electronically fuel-injected as opposed to carbureted
"T" indicates the engine has a factory installed turbocharger

RB20
There were a variety of 2.0 L RB20 engines produced:
RB20E - single-cam (85 to 96 kW (115 to 130 PS) @ 5600 rpm, 167 to 181 N·m (17 to 18,5 kgf·m) @ 4400 rpm)
RB20ET - single-cam turbocharged (107 kW (145 PS) @ 6000 rpm, 206 N·m (21.0 kgf·m) @ 3200 rpm)
RB20DE - twin-cam (110 to 114 kW (150 to 155 PS) @ 6400 rpm, 181 to 186 N·m (18.5 to 19 kgf·m) @ 5600 (and later with a NEO-Head 4400 rpm)
RB20DET - twin-cam turbocharged (158 kW (215 PS) @ 6400 rpm, 265 N·m (27.0 kgf·m) @ 3200 rpm)
RB20P - single-cam (94 PS @5600 rpm and 142 N·m @2400 rpm)
RB20DET-R - twin-cam turbocharged (210 PS @6400 rpm and 245 N·m @4800 rpm

RB25
The 2.5 L RB25 engine was produced in three forms:
RB25DE - twin-cam 140 kW/190 PS and 147 kW/200 PS (with VCT) @ 6000 rpm, 255 N·m (26.0 kgf·m) @ 4000 rpm)
RB25DET - twin-cam turbo (T28 Turbo) (245 to 250 hp and 319 N·m)
NEO RB25DET - twin-cam turbo (206 kW (280 PS) @ 6400 rpm, 362 N·m (37.0 kgf·m) @ 3200 rpm)

RB26
The GT-R of the 1990s included a 2.6 L straight six-cylinder twin-turbo engine producing 206 kW (276 hp). While the published figures from Nissan were as quoted above, practical tests showed the car had a factory power output of closer to 330 PS (325 hp) at the flywheel. The lower published figure was Nissan's response to the need to abide by a gentleman's agreement between the Japanese auto manufacturers not to release a car to the public exceeding 280 PS (276 hp) of power output.

The most improved N1 engine is the R34 Nür engine. It is based on the R34 N1 engine. The camshafts were further improved for power, and the crankshaft was further balanced for higher engine speed. There were 1000 Nür engines made by Nissan and all were used in the R34 V-spec II Nür, and R34 M-spec Nür models. They were advertised as making the same 280 PS (276 hp) as the standard model, but with the lighter engine parts, and more efficient turbochargers, the engine would make closer to 350 hp (260 kW).


RB30
Nissan did not produce this engine, but it refers to a turbocharged engine featuring an RB30E block with a twin-cam head conversion. The fitment of a twin cam head from any of these engines onto a standard compression RB30E bottom end gives an ideal compression ratio for a mild to moderately modified street turbo engine, making the conversion popular amongst those who would otherwise convert their RB30E to a high compression RB30ET using original ET bolt on externals.

Although it has a larger displacement than the RB26DETT, maximum possible horsepower is less, as the RB30 block lacks the RB26 block's internal cast-in bracing, and consequently cannot rev as high due to harmonic issues at ~7500 rpm. To compensate, the RB30DET produces more torque at lower revs. There is also an 'RB30DETT' kit manufactured by OS Giken of Japan, which bolts an extension on top of the RB26 engine block, and fits liners, to give an 86 mm bore x 86 mm stroke. It is available as an assembled short block, containing billet chrome-molybdenum crank, billet chrome-molybdenum H-beam connecting rods, forged pistons.