The Nissan RB20DE is a 1,998 cc, inline‑six petrol engine produced between 1985 and 1998. It features a cast iron block, aluminium cylinder head, DOHC valvetrain with 24 valves total, and electronic fuel injection. This naturally aspirated powerplant delivered 103–110 kW (140–150 PS) and 179–186 Nm of torque, engineered for smooth, linear power delivery and refined operation.
Fitted to models such as the Skyline (R31/R32), Laurel (C32/C33), and Cefiro (A31), the RB20DE was designed for balanced performance and everyday drivability in mid-size sedans and coupes. Emissions compliance for its era was managed through its electronic fuel injection system and catalytic converter, meeting applicable Japanese and export market standards for its production years.
One documented generational update is the transition from the early RB20E (SOHC) to the RB20DE (DOHC) in 1985, which significantly improved high-RPM power and efficiency. Later revisions, referenced in Nissan Technical Bulletin NTB89-065, included updates to the ignition system and ECU mapping for enhanced emissions control and reliability.
Production years 1985–1998 meet applicable emissions standards for their respective model years and markets (VCA UK Type Approval records for relevant chassis codes).
The Nissan RB20DE is a 1,998 cc inline-six petrol engine engineered for mid-size sedans and coupes (1985-1998). It combines dual overhead camshafts with electronic multi-point fuel injection to deliver smooth, linear power and refined operation. Designed to meet the emissions standards of its production era, it prioritizes mechanical durability and a broad, usable powerband.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,998 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-6, DOHC, 4 valves per cylinder | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 78.0 mm × 69.7 mm | |
| Power output | 103–110 kW (140–150 PS) @ 6,400 rpm | |
| Torque | 179–186 Nm @ 4,800 rpm | |
| Fuel system | Electronic multi-point fuel injection (Nissan ECCS) | |
| Emissions standard | Applicable standards for model year (e.g., Japanese 1983, US Federal) | |
| Compression ratio | 9.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven (single primary chain) | |
| Oil type | API SF/SG, SAE 10W-30 or 10W-40 | |
| Dry weight | 175 kg |
The DOHC design provides excellent high-RPM performance and requires no periodic valve adjustments. The timing chain is generally robust but should be inspected if a rattle develops. Using high-quality conventional or synthetic 10W-30/40 oil meeting API SF/SG specifications is recommended. The cast iron block is very durable, but coolant system maintenance is critical. The distributorless ignition system (DIS) is reliable, but coil packs may fail with age.
Oil Specs: Requires API SF/SG specification (Nissan Owner's Manual). Modern equivalents (API SN) are acceptable if viscosity grade is maintained.
Emissions: Compliance varies by market and model year (e.g., Japanese 1983 regulations, US Federal Tier 0). Consult VCA or local type approval for specific chassis.
Power Ratings: Measured under SAE net standards. Output varies slightly by application and model year (Nissan Group PT-1990).
Nissan Technical Information System (TIS): Manuals SM-EC-85, SM-EN-90
Nissan Technical Bulletins: NTB85-070, NTB89-065
SAE International: J1349 Engine Power Certification Standards
The Nissan RB20DE was used across Nissan's R31/C32/A31 platforms with longitudinal mounting. This engine received minor ECU and ignition system updates over its lifespan, but core mechanical components remained consistent, ensuring broad parts interchangeability. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on a flat pad on the front of the cylinder block, near the timing cover. The 8th VIN digit typically indicates engine type ('R' for RB-series in many markets). Visually, it is an inline-six with a single cam cover spanning the entire cylinder head and no turbocharger. Critical differentiation from RB20DET: The RB20DE lacks a turbocharger, intercooler, and associated plumbing. The intake manifold is also simpler. Electrical connectors for the ECU may differ between early and late models due to ignition system updates.
The RB20DE's primary reliability risk is age-related failure of ignition components, with elevated incidence in high-mileage vehicles. Nissan technical bulletins document updates to the ignition system for improved durability, while owner reports frequently cite coil pack and sensor failures. Regular inspection and using quality replacement parts make maintaining smooth operation critical.
Analysis derived from Nissan technical bulletins (1985-1998) and aggregated owner-reported failure data (1995-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about NISSAN RB20DE.
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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