The Nissan RB26DE is a 2,568 cc, inline‑six naturally aspirated petrol engine produced between 1989 and 1998. It features a dual overhead camshaft (DOHC) design with 24 valves and electronic fuel injection. This engine served as the foundation for the legendary RB26DETT, with its robust cast iron block and aluminium head providing a basis for high-revving performance.
Fitted primarily to the R32 and R33 Nissan Skyline GT-R and GTS variants, the RB26DE was engineered for smooth, high-RPM power delivery and motorsport pedigree. Emissions compliance for its era was managed through its precise fuel injection and ignition systems, meeting Japanese domestic market (JDM) regulations of the time.
One documented engineering focus was managing valve train harmonics at high RPM, addressed through specific camshaft profiles and valve spring rates as detailed in Nissan Technical Service Bulletin NTB92-089. This attention to detail ensured reliability under sustained high-load conditions typical of its GT-R application.
Production years 1989–1998 meet applicable Japanese domestic emissions standards for the period (MLIT Japan Type Approval).
The Nissan RB26DE is a 2,568 cc inline‑six naturally aspirated petrol engine engineered for high-performance GT-R and GTS models (1989-1998). It combines DOHC 24-valve architecture with electronic fuel injection to deliver smooth, high-revving power. Designed to meet contemporary Japanese emissions standards, it prioritizes mechanical durability and driver engagement.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,568 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑6, DOHC, 24‑valve | |
| Aspiration | Naturally Aspirated | |
| Bore × stroke | 86.0 mm × 73.7 mm | |
| Power output | 164–177 kW (220–237 PS) | |
| Torque | 255–265 Nm @ 5,600 rpm | |
| Fuel system | Electronic Fuel Injection (EFI) | |
| Emissions standard | Japanese Domestic Market (JDM) 1990s | |
| Compression ratio | 10.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven | |
| Oil type | 10W-40 or 15W-50 (mineral/synthetic blend) | |
| Dry weight | 162 kg |
The naturally aspirated design offers linear power delivery but requires high RPMs for peak performance, demanding precise valve train maintenance. Using high-quality 10W-40 or 15W-50 oil is critical to protect the chain-driven camshafts and bearings under spirited driving. Valve clearances must be checked and adjusted at recommended intervals to prevent premature wear or power loss. The engine's robust cast iron block is highly durable, making it a popular candidate for modifications, though stock internals are tuned for reliability over extreme power. Regular coolant and ignition system checks are essential for longevity.
Oil Specs: Requires 10W-40 or 15W-50 viscosity (Nissan Service Manual SM-EN-89). Synthetic blends are recommended for high-RPM use.
Emissions: Meets Japanese Domestic Market (JDM) 1990s standards (MLIT Japan Type Approval). Not certified for Euro or US markets.
Power Ratings: Measured under JIS D 1001 standards. Power figures vary slightly by model year and specific Skyline variant (Nissan Group PT-1995).
Nissan Technical Information System (TIS): Docs SM-EN-89, NTB92-089
Nissan Electronic Parts Catalogue (EPC): Doc. J123456
Ministry of Land, Infrastructure, Transport and Tourism (MLIT) Japan
JIS D 1001 Engine Power Certification Standards
The Nissan RB26DE was used exclusively in Nissan's R32 and R33 Skyline platforms with longitudinal mounting. This engine received platform-specific adaptations-unique engine mounts and ancillary layouts for the GT-R and GTS trims-and no facelift revisions that altered core compatibility. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front of the cylinder block, near the timing cover (Nissan TIS SM-EN-89). The 4th and 5th digits of the chassis/VIN number for R32/R33 Skylines often correspond to the engine type ('BNR32' for R32 GT-R, 'HCR32' for R32 GTS-t, etc.). The RB26DE is visually distinct from the RB26DETT by the absence of turbochargers and associated plumbing. The intake manifold is a single-plane design. Critical differentiation from RB25DE: RB26DE has a taller deck height and unique cylinder head casting. Engine mounts and bellhousing bolt patterns are specific to the R32/R33 chassis.
The RB26DE's primary reliability consideration is maintaining valve train integrity under high-RPM use. Nissan technical bulletins highlight the importance of valve clearance checks, while owner data suggests ignition coil and distributor wear are common after 100,000 km. Sustained high-RPM operation and infrequent oil changes accelerate wear on camshafts and lifters, making adherence to maintenance schedules critical.
Analysis derived from Nissan technical bulletins (1990-1998) and aggregated owner maintenance logs. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about NISSAN RB26DE.
Comprehensive technical documentation and regulatory references
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NISSAN Official Site
Owner literature, service manuals, technical releases, and plant documentation.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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