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Nissan RB26DETT Engine

 

In 1989 Nissan has released the new R32 Nissan Skyline. The top-line model was carrying the “GT-R” badge. Nissan Skyline GT-R was offered with the latest development of RB engine family called RB26DETT, which by many, is referred as one of the mightiest Japanese performance engines ever produced. Inline-six cast iron block was fitted twin turbochargers and a DOHC head with 4 valves per cylinder. The engine was capable of revving up to 8200RPM thanks to its over-square design.

 

 

RB26DETT is generally known for its extraordinary strength. Although sometimes accused of being too heavy, RB26DETT owes this reputation to its cast iron block. The strength of the cast iron block was increased further by a reinforced crankcase. Rib bearing was used to connect the crankcase to the one-piece ladder frame block. 86mm bore and 73.7mm stroke of RB26DETT gave a total displacement of 2568cc and compression ratio was set at 8.5:1. Cast aluminum pistons were featuring oil cooling channels and oil squirters were placed underneath the pistons.

 

All aluminum DOHC head with pent-roof combustion was utilizing a cross-flow design. Belt driven camshaft durations were 240° for intake and 236° exhaust, with 8.58mm and 8.28mm of lift respectively. Valve diameters were measuring 34.5mm for intake and 30mm for exhaust. RB26DETT‘s exhaust valve stems were sodium filled which is very rare in production engines. Exhaust valves with sodium filled stems have better heat conductivity which aids in transferring the heat away from the valve head. Unlike the hydraulic lifters found on the rest of the RB-Series engines, in RB26DETT valves were driven by bucket-type followers to prevent valve-train failures at high engine speeds.

Nissan RB26DETT Engine

 

RB26DETT was equipped with twin Garrett T28 ceramic turbochargers that worked in parallel, utilizing three cylinders per turbocharger. Each turbocharger had its own cast iron exhaust manifold and blow-off valves. Both turbochargers were breathing through a single front-mount air-to-air intercooler. Turbo boost was controlled by the ECU it was set at a maximum of 10 PSI.

 

 

For better throttle response a highly sophisticated induction system was utilized. This system was consisted of six individual throttle bodies which were connected to a log type large volume plenum chamber. For maximum combustion efficiency and a direct ignition coil system was used. RB26DETT was placed in every R32, R33 and R34 Nissan Skyline GT-R. Besides minor cosmetic updates and ECU fine tunings, the only significant change in the engine components was the ball bearing T28 turbochargers found on R34 Skyline GT-R, opposed to journal bearing T28 turbochargers found on R32 and R33 Skyline GT-R. Peak output of all engines was 280hp at 6800RPM.

 

Nissan’s tuning company Nismo offered limited editions of Nissan Skyline GT-R’s called “N1” and “Z2”. These models were equipped with more powerful versions of RB26DETT. These engines had bigger turbochargers, wilder cams and Z2 model was stroked to 2.8 liters. The production of RB26DETT ended in 2002 along with the production of R34 Nissan Skyline GT-R.

 

 

Model

RB26DETT

Displacement (cc)

2568

Power Output (hp)

280

Compression Ratio

8.5:1

Bore (mm)

86.0

Stroke (mm)

 73.7

Years Produced

1989 - 2002

 

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