RB26DETT

From top to bottom: The good and the badĀ 

Top of the motor

  • Valve/Cam cover
  • Spark plug cover
  • Front cover
  • Ignitor box
  • Coils
  • Spark Plugs
  • Camshafts
  • Valves
  • Head bolts
  • Head
  • Head gasket

Induction side

  • Plenum
  • Throttle body
  • Balance tube

Exhaust side

  • Exhaust manifold
  • Turbocharger
  • Exhuast elbow
  • Downpipe(Frontpipe)

Bottom end of the motor

  • Pistons
  • Rods
  • Oil squirters
  • Crankshaft
  • Main cap/girdle
  • Oil pan

Engine Control Unit

  • ECU
  • MAF
  • Fuel injectors
  • Fuel pump
  • Crank angle sensor

Induction

  • Inlet piping
  • Turbo outlet piping
  • Intercooler

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

  • Rated at 280 hp stock from 1989-2001
    • Found in the R32, R33, R34 GT-R
  • Inline 6
  • Iron block, aluminim head
  • 2568cc of displacement
  • 86mm bore x 73.7mm stroke
  • Twin turbo
  • Individual throttle bodies - thats six
  • Coil on plug ignition
  • Interference engine

Top of the motor

  • Valve/Cam covers
    • 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
    • We like to leave them off to keep the coils cooler. The engine looks more finished with the spark plug cover. You know the piece. Says RB26DETT on it.
  • Front cover
    • The piece that says RB26. Covers the timing belt. Not recommended to leave off. Aluminim on R32/R33. Plastic on R34.
  • Ignitor box
    • R32/R33 located at the back of the spark plug cover. Ignitors are build into the coils in the R34.
  • 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 8.58 240 duration 113 deg Lobe Center -R34N1 117 deg Lobe Center
    • Exhaust 8.28 236 duration 125 deg Lobe Center-R33N1 120 deg Lobe Center - R34N1 121 deg
  • Valves
    • Intake 34.5 mm
    • Exhaust 30 mm
  • Head bolts
    • (14) 12 mm head bolts
  • Head
    • 4 valves per cylinder. Twin cam. Cam on bucket. Shim under bucket adjustment
  • Head gasket

Induction side

Lean cylinder is #6.

  • Throttle body
  • Balance tube
    • Vacuum/boost and water pass though the balance tube

Exhaust side

  • Exhaust manifold
    • Stock
    • N1
  • Turbocharger
    • Ceramic exhaust wheels that break off
  • Exhuast elbow
  • Downpipe(Frontpipe)

Bottom end of the motor

  • Pistons
    • 86mm. Stock pistons are oil cooled. 1.5 mm top ring, 1.5 mm 2nd ring.
  • Rods
    • 121.5mm center to center.
  • Oil squirters
  • Crankshaft
  • 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 diff.

  • Block
    • 05u on the side. Thats a standard block.
    • 24U on the side. Thats an N1 block
    • GT Block. That one is special
  • Water pump
    • Stock
    • N1

Engine Control Unit

  • ECU
  • MAF
    • 65mm. Each will meter air up to about 200 whp each.
  • Fuel injectors
    • 444 cc. Yellow top. Top feed, Low impedence
  • Fuel pump
    • 195 liters per hour - R32
  • Crank angle sensor
    • R32-R33
    • R34
    • The R34 uses a different cam drive for the sensor.

Induction

  • Inlet piping
    • Rear inlet piping collapses under boost.Replacing it with hardpipe is recommended.
  • Turbo outlet piping
    • The stock outlet piping causes the air out of the turbocharges to come together roughly.
  • Intercooler
    • Stock intercooler will provide better response to approximately 600 wheel horsepower.