|Twin T51R SPL RB26DETT|
1000 horsepower stock?
Just put a chip to make 500 horsepower?
Is it true that the RB26 early block from the BNR32 is very durable compared to other standard blocks?
- Rated at 280 ps (Pferdestärke) or 276 horsepower stock from 1989-2002
- Found in the R32, R33, R34 GT-R
- Also found in the Stagea 260RS (aka Nissan Skyline GT-R Wagon)
- The RB26DE was available in the Autech R32
- Inline 6 cylinder
- Iron block
- Aluminum head
- 24 valve
- 2568cc of displacement
- 86mm bore x 73.7mm stroke
- Twin turbo
- Individual throttle bodies - that is six in groups of 2
- Coil on plug ignition
- Interference engine
|Stock R32 Dyno chart|
|R34 - Nissan Skyline GT-R|
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
Nissan Twin Cam 24 valve on it.
- Front cover
- The part that says RB26. Covers the timing belt. Not recommended to leave off.
- Aluminum on R32/R33.
- Plastic on R34.
- Igniter box
- R32/R33 located at the back of the spark plug cover.
- Igniters are build into the coils in the R34.
- Coil on plug. R32/R33 are the same.
- The front two coils on a early 90's Infiniti Q45 are the same
- R34s have the igniter built in.
- 22448-25U00 (coil assy)
- 22465-59S00 (boot)
- How to clean/repair misfires.
RB26 coils or coil packs
- Spark Plugs
- PFR6A-11 are the stock plugs
- Heat range 6
- 1.1 mm gap
- NGK are the best plugs
- BCPR7EIX are one heat range cooler and iridium
- We like the racing NGK when we are serious. Double fine wire heat range 10
- 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
- Camshaft valve clearance check and adjustment
- Intake 34.5 mm
- Exhaust 30 mm(sodium filled)
- Head bolts
- (14) 12 mm head bolts
- 4 valves per cylinder
- Twin cam
- Cam on bucket
- Shim under bucket adjustment
- Head gasket
|RB26 combustion chamber|
- Lean cylinder is #6.
- Throttle body
- 6 individual throttle bodies. Cars have done over 1000 whp on stock throttle bodies.
- Balance tube
- Vacuum/boost and water pass though the balance tube
- Exhaust manifold
- Ceramic exhaust wheels that break off
- The RB26 used a ceramic exhaust wheel to reduce the weight and interia, plus increase the heat capacity of the turbocharger. Great in theory, but in real life, overspinning the turbo, or detonation causes the ceramic wheel to become detached from the turboshaft. Anything above about 14 psi, about 1 bar is considered dangerous. However even with less boost, and bouncing off a rev limiter (like a Bee-R limiter) will most likely result in missing exhaust wheels, and normally aspirated, low compression RB26's.
- Exhaust elbow/Outlet pipe
- Contains 02 sensors
- R32 are narrow/small 02 sensors
- R33/R34 are "normal" size
- Cast piece for the R32/R33
- R34 Vspec has EGT in rear turbo outlet
- Stock is relatively small diameter
- Has a flex tube in it. The flex tube is important due to the rocking motion of the engine
Bottom end of the motor
- 86mm. Stock pistons are oil cooled.
- 1.5 mm top ring, 1.5 mm 2nd ring.
- N1 has 1.2 mm top and 2nd ring
- 121.5mm center to center.
- RB28's have 119.5 c-c except in a GT block(RRR)
- Oil squirters
- Main cap/girdle
- Seven main bearings.
- #4 being the center main bearing and containing the thrust bearing.
- The other six main bearings are all the same construction.
Bottom end of the RB26 showing the main girdle
- Oil pump
- The early cars- pre 1991 had a narrow oil pump drive as listed above
- The only way to remove the oil pump, is to pull/drop the pan, as the oil pump relief valve prevents you from pulling it straight off the end of the crank
- The OEM design leaves some areas to address, as it has a tendency to be loose on the crank drive. The looseness eventually causes the oil pump to crack at the flats. This causes oil to push out the front main seal
- We had tons of problems with N1 oil pumps, and won't use them on any of our builds
- There are some aftermarket solutions, such as spline drives.
- Oil pan
- Cast aluminum
- Contains the front differential
- Weighs about 55 lbs
|The front differental is on the right side of this picture|
- Water pump
Far pump is N1, close is normal. Notice the N1 backing plate
Engine Control Unit
- 65mm. Each will meter air up to about 200 whp each.
- Fuel injectors
- 444 cc.
- Yellow top.
- Top feed
- Low impedance
- Fuel pump
- 195 liters per hour - R32
- Crank angle sensor
- Late R32 and early R33 had a slightly different looking sensor
- The R34 uses a different cam drive for the sensor.
- Checking ignition timing and TDC
|R34 CAS on the left, R32/R33 on the right|
- Inlet piping
|Divided twin turbo pipe|
- 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.
- Testing a modified "twin turbo" pipe
- Stock intercooler will provide better response to approximately 600 wheel horsepower.
- The factory cooler is front mount, fairly large for a stock part, with large inlets and outlets.