The RB26DETT. An engine of much myth. We are going to try and set out some truths.

  • Member of the RB engine family, descendant of the Nissan L20A.
  • Rated at 280 hp stock from 1989-2001.
  • Found in the R32, R33, and R34 GT-R.
  • Inline 6 cylinder, Iron block, aluminum head.
  • 2568cc of displacement.
  • 86mm bore x 73.7mm stroke. 96.5mm bore spacing.
  • Twin turbo (parallel).
  • Individual throttle bodies (6).
  • Coil on plug ignition.
  • Interference engine.


  • Valve/Cam covers
    • Cast aluminum. Black on R32/R33. Red on R34. Nur on the Nurs. Two breathers located at the back of the plenum. Drivers side goes to PCV valve. There is a crossover tube. Left side goes to the inlet side of the rear turbo.
  • Spark plug cover
    • You know the piece. Says RB26DETT GT-R on it. The engine looks more finished with the spark plug cover. We like to leave them off to keep the coils cooler.
  • Front cover
    • The piece that says RB26. Covers the timing belt. Not recommended to leave off. Aluminum on R32/R33. Plastic on R34.
  • Ignitor chip
    • R32/R33: Located at the back of the spark plug cover.
    • R34: Ignitors are built into the coils on the R34. (No external ignitor chip).
  • Coils
    • Coil on plug. R32/R33 are the same. R34s have the ignitor built in.
  • Spark Plugs
    • PFR6A-11 are the stock plugs.
  • Camshafts
    • Intake 8.58mm lift, 240° duration. 113° deg Lobe Center.
    • Exhaust 8.28mm lift, 236° duration. 125 deg Lobe Center
    • R33 N1 exhaust cam has 120° lobe center. R34 N1 lobe centers: Intake 117°, exhaust 121°.
  • Valves
    • Intake 34.5mm
    • Exhaust 30mm
  • Head bolts
    • (14) 12 mm head bolts
  • Head casting
    • 4 valves per cylinder. Twin cam. Cam on bucket. Shim under bucket adjustment
  • Head gasket
    • Bore diameter is 87.22mm

Induction side

  • Intake plenum, (not intake manifold). aka surge tank, collector
  • Throttle bodies.
    • 6 individual throttle bodies. Located in between the intake plenum and the head. Cars have done over 1000 whp on stock throttle bodies.
  • Balance tube
    • Vacuum/boost and water pass though the balance tube

Exhaust side

  • Exhaust manifolds
    • Two manifolds. Feed 3 cylinders each into the turbine housing. T25 outlet. Cast, and durable.
    • Stock
    • N1
  • Turbochargers
    • Ceramic exhaust wheels that break off
    • Internally wastegated turbine housing.
    • T25 two bolt compressor inlet. T25 turbine inlet. 5 bolt turbine outlet.
  • Exhaust elbow
  • Downpipe(Frontpipe)

Block and rotating assembly

  • Pistons
    • 86mm. Stock pistons are oil cooled. 1.5 mm top ring, 1.5 mm 2nd ring.
  • Rods
    • 121.5mm center to center.
  • Water pump
    • Stock
    • N1
  • Oil Pump
    • OE pump commonly fails with sustained high RPM use
    • N1 is the same pump with a stiffer spring
  • Oil squirters
  • Crankshaft
    • Early R32 crankshaft has a narrow oil pump drive.
    • Later R32 and all R33, R34 crankshafts have a wide oil pump drive.
  • Main cap/girdle
    • 7 main bearings. #4 being the center main bearing and containing the thrust bearing. The other 6 bearings are the same construction.
  • Oil pan
    • Cast aluminum. Contains the front differential.
  • Block casting
    • 05u on the side. Thats a standard block.
    • 24U on the side. Thats an N1 block
    • GT Block. That one is special

Engine Control

  • ECU
    • Takes inputs (CAS, MAFs), references maps, and outputs (Injector pulsewidth, ignition).
  • MAF
    • 65mm diameter. Uses a hot wire and measures voltage needed to keep wire at temperature. Voltage range is such that each will meter air up to approximately 200whp (400whp total)
  • Fuel injectors
    • 444 cubic centimeters/minute at stock fuel pressure. Yellow top. Top feed, Low impedance. Denso style.
  • Fuel pump
    • 195 liters per hour - R32
  • Crank angle sensor
    • R32-R33
    • R34 uses a different cam drive for the sensor.

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