text: 'I' beam connecting rods There is a common oiling problem with the pre-1992 R32 RB26 motors, as the surface where the crankshaft meets the oil pump was machined too small, eventually leading to oil pump failure at high rpm. This issue was resolved in later versions of the RB26 with a wider oil pump drive, which is found in all R33+ RB26 motors. Aftermarket performance parts makers also make oil pump extension drive collars to rectify this problem. More recently a spline drive solution has been developed by an aftermarket tuner Supertec Racing who moves away from the OEM flat drive system and uses splines to drive the oil pump gears in the same way as the Toyota's 1JZ-GTE engine found in the Toyota Supra (MK3). This kit is available for most uprated RB26 oil pumps including Nissan's own OEM, N1 and Nismo parts, although most high HP RB-series engines all over the world have been proven to be reliable without spline driven oil pumps when built and tuned correctly.
  Besides minor cosmetic updates and ECU fine tunings, changes were made in the R34 generation to ball bearing T28 turbochargers as opposed to journal bearing turbos. The R34 GT-R turbos retained the ceramic exhaust turbine wheel. Models that had steel exhaust turbine wheels included the R32 Nismo, R32-R33-R34 N1 models and R34 Nür spec skyline GT-R's.
  R34 GT-R model RB26DETT engine specific differences to the R32-R33 engines include:
  Candy red cam/coil pack covers
  Different coil cover emblem
  Plastic CAM gear cover
  Non-painted inlet plenum (apparently also a lighter casting)
  Hitachi CAS (Crank angle sensor) has different drive fitting compared to earlier R32-R33 exhaust cams