Bore and stroke
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.
The stock dimensions for the RB engines
RB20 2.0 L 1998cc, bore 78.0mm, stroke 69.7mm
RB24 2.4 L 2428cc, bore 86.0mm, stroke 69.7mm
RB25 2.5 L 2498cc, bore 86.0mm, stroke 71.7mm
RB26 2.6 L 2568cc, bore 86.0mm, stroke 73.7mm
RB30 3.0 L 2962cc, bore 86.0mm, stroke 86.0mm
“D” indicates a double overhead cam as opposed to a single overhead cam
“E” indicates the engine is electronically fuelinjected
“S” indicates the engine is carburetted
“T” indicates the engine has a factory installed turbocharger
“TT” indicates the engine has factory twin turbochargers
RB20
RB20E engine in an R31 Nissan Skyline
There were a variety of 2.0 L RB20 engines produced
RB20E singlecam 96 to 110kW 130 to 145ps @ 5600rpm, 167 to 181Nm 17 to 18,5kgfm @ 4400rpm
RB20ET singlecam turbocharged 125kW 170PS @ 6000rpm, 206Nm 21.0kgfm @ 3200rpm
RB20DE twincam 110 to 114kW 150 to 155PS @ 6400rpm, 181 to 186Nm 18.5 to 19kgfm @ 5600 and later with a NEOHead 4400rpm
RB20DET twincam turbocharged 158kW 215PS @ 6400rpm, 265Nm 27.0kgfm @ 3200rpm
RB20P singlecam 94PS @5600rpm and 142Nm @2400rpm
RB20DETR twincam turbocharged 210ps @6400rpm and 245Nm @4800rpm
The first RB20E/ET/DE/DET engines were fitted to the R31 Skyline.
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The early twin cam engines are generally referred to as ‘Red Top’ engines because they have red cam covers.
The early twin cam engines featured the NICS Nissan Induction Control System injection system, while the later twin cam engines used ECCS Electronically Concentrated Control System. 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 RB20E was also fitted to some Holden Commodores the VL Commodore sold in New Zealand, and also to the A31 Cefiro. The Z31 200ZR was fitted with an intercooled NICS type RB20DET.
RB20ET engine in an R31 Passage Wagon
Laurels, R32 Skyline and Cefiros used the second 19881993 series RB20E/DE/DET. This had an improved head design, and used the ECCS injection system. These later motors are known as ‘Silver Top’ engines.
The RB20DETR was used in the Nissan Skyline 2000GTSR HR31. It is limited to 800 units.
The RB20P is the autogas LPG Liquefied petroleum gas version of the RB20, but with 12 valves OHC.
RB20DET swap into a Nissan 240SX
RB24S
This is a relatively rare engine, as it was not produced for the Japanese domestic market. These were fitted to some left hand drive Nissan Cefiros exported from Japan new. Mechanically it is made from an RB30E head, RB25DE/DET block and RB20DE/DET crank with 34mm height pistons. This engine used carburettors instead of the Nissan ECCS fuel injection system. It is able to rev harder than the RB25DE/DET as it has the same stroke as the RB20DE/DET as well as being almost the same displacement as the RB25DE/DET. A common modification is to fit a twin cam head from other RB series motors while retaining the carburettor setup. The standard single cam form produced 141PS @ 5000rpm and 20.1 kgfm 197 Nm of torque @ 3000rpm.
Nissan RB24S engine, Carburettor, SOHC, Used on Cefiro A31Japan and Laurel Altima A31 Latin America
RB25
1993 RB25DET with VCT
1998 NEO RB25DET
The 2.5 L RB25 engine was produced in three forms
RB25DE NON TURBO twincam 140kW/190PS and 147kW/200PS with VCT @ 6000rpm, 255Nm 26.0kgfm @ 4000rpm
RB25DET twincam turbo T3 Turbo 245 to 250hp and 319Nm
NEO RB25DET twincam turbo 206kW 280PS @ 6400rpm, 362Nm 37.0kgfm @ 3200rpm
RB25DE and DET engines produced from August 1993 also featured NVCS Nissan Variable Cam System for the intake cam. This gave the new RB25DE more power and torque at lower rpm than the previous model.
In May 1998 a NEO head was fitted, which enabled the engine to be classified as a low emission vehicle engine LEV. The nonVCT and nonturbo was fitted to the R32 Skyline, the VCT turbo and nonturbo was fitted to R33 Skylines and the WC34 Stagea. R34 Skylines also use these engines.
RB26DETT
RB26DETT from an R34 GTR.
The RB26DETT engine is a 2.6L Inline6 engine manufactured by Nissan, for use primarily in the 19892002 Nissan Skyline GTR. The RB26DETT engine block is made from cast iron, and the cylinder head is made from aluminium. The cylinder head contains 24 valves 4 valves per cylinder, and uses a dual overhead camshaft setup. The intake of the RB26DETT varies from other RBseries motors in that it has six individual throttle bodies instead of a single throttle body. The engine also uses a parallel twin turbo system. The turbo system is arranged so that the front turbo is powered by the front 3 cylinders, and the rear turbo is powered by the rear 3 cylinders. The turbo chargers are of equal size, and are set by the wastegates to limit boost pressure to 10 psi, although the Skyline GTR has a built in boost restrictor to keep boost under 14 psi.
The first 2.6 L RB26DETT featured twinturbochargers and produced around 280 HP 206 kW @ 6800 rpm and 260 ftlb 353 Nm @ 4400 rpm. The last series of the RB26DETT produced 280 PS 206 kW @ 6800 rpm and 289 ftlb 392 Nm @ 4400 rpm. However, several stock unmodified engines have been dyno tested and reported to obtain closer to the 320 HP mark. The reason for this discrepancy is a gentlemen’s agreement between Japanese automakers to limit the advertised horsepower of any vehicle to 280 PS 276HP. It is widely known for its strength and extreme power potential. It is not uncommon for 600 hp to be achieved without modification of the engine internals. With regular maintenance, many of these engines have been driven way past the 100,000 mile mark with a few heading toward 200,000 miles. With extreme modification, the RB26 motor is capable of power in excess of 1 megawatt or over 1,340hp.
There is a common oiling problem with the pre1992 R32 RB26 motors, as the surface where the crank meets the oil pump was machined too small, eventually leading to oil pump failure at high rpm. This was fixed for later versions of the RB26. After market performance parts makers also make oil pump extension drives to rectify this problem.
Originally the R32 GTR was planned to have a 2.4L RB24DETT, and compete in the 4000cc class in Group A rules, the displacement is multiplied by 1.7 if the engine is turbocharged. This was when Nismo was going through the process of designing the R32 GTR to be a Group A race car. But when the engineers added the AWD system, it would make the car heavy and less competitive. Nismo made the decision to make the engine a 2.6L twin turbo, and compete in the 4500cc class, resulting in the RB26DETT known today.
The RB26DETT was used in the following cars
Nissan Skyline GTR R32
Nissan Skyline GTR R33
Nissan Skyline GTR R34
Nissan Stagea 260RS
Tommy Kaira ZZ II
RB26DETT N1
The RB26DETT N1 is a modified version of the RB26DETT engine, developed by Nismo Nissan Motorsports for Group A and Group N motorsport. Nismo found that the standard RB26DETT engine required too much maintenance for use in a GroupA or GroupN race car and consequently designed the N1 block. Nismo balanced the crankshaft to a higher specification than stock, as the RB26DETT engine experiences vibrations between 7000 and 8000rpm. The engine also received improved water channels within the engine block.
