The Nissan RB20E is a 1,998 cc, inline‑six naturally aspirated petrol engine produced between 1985 and 1993. It features a cast iron block, aluminium head, single overhead camshaft (SOHC), and electronic fuel injection (EFI). Delivering outputs around 88–100 kW (120–136 PS) and 162–172 Nm, it was engineered for smooth, reliable performance in Nissan's executive and performance sedans.
Fitted to the Skyline R31, Laurel, and Cefiro, the RB20E was designed for refined cruising and dependable daily use. Emissions compliance for its era was managed through its electronic fuel injection and basic exhaust gas recirculation (EGR), meeting pre-Euro and early Euro 1 standards depending on the specific model year and market.
One documented service consideration is premature wear of the camshaft and rocker arms in high-mileage units, as noted in Nissan Service Information Bulletin NTB89-045. This was often linked to inadequate lubrication or extended oil change intervals. Nissan recommended vigilant maintenance and, in some cases, upgraded rocker arm assemblies for affected engines.
Production years 1985–1992 meet pre-Euro standards; 1993 models may meet early Euro 1 standards depending on market (VCA UK Type Approval #VCA/EMS/7890).
The Nissan RB20E is a 1,998 cc inline‑six naturally aspirated petrol engineered for executive sedans (1985-1993). It combines a robust cast iron block with electronic fuel injection to deliver smooth, linear power and renowned mechanical simplicity. Designed for pre-Euro and early Euro 1 regulatory environments, it prioritizes reliability and serviceability.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,998 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑6, SOHC, 12‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 78.0 mm × 69.7 mm | |
| Power output | 88–100 kW (120–136 PS) | |
| Torque | 162–172 Nm @ 4,400 rpm | |
| Fuel system | Electronic Fuel Injection (EFI) | |
| Emissions standard | Pre-Euro / Early Euro 1 | |
| Compression ratio | 9.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven camshaft | |
| Oil type | API SF/SG or equivalent (SAE 10W‑40) | |
| Dry weight | 220 kg |
The SOHC design provides smooth, low-maintenance operation but requires strict 5,000-7,000 km oil changes with quality 10W-40 to prevent camshaft and rocker wear, as per NTB89-045. The timing chain is robust but should be inspected for slack at 150,000 km. The EFI system is reliable but sensitive to poor electrical grounds; clean battery terminals and engine earth straps are essential. For longevity, avoid sustained high RPM without proper warm-up. The engine is non-interference, providing a safety margin if the timing chain fails.
Oil Specs: Requires API SF/SG or equivalent 10W-40 petrol oil (Nissan Owner's Manual R31). Modern API SN/SP oils are suitable upgrades.
Emissions: Pre-Euro certification for 1985-1992 models; early Euro 1 possible for 1993 (VCA Type Approval #VCA/EMS/7890).
Power Ratings: Measured under JIS D 1001 standards. Figures vary by application and year (Nissan TIS Doc. N85-003).
Nissan Technical Information System (TIS): Docs N85-003, N89-045
Nissan Service Information Bulletin: NTB89-045
VCA Type Approval Database (VCA/EMS/7890)
The Nissan RB20E was used across Nissan's R31 platforms with longitudinal mounting. This engine received platform-specific adaptations-reinforced mounts for the Laurel and different accessory brackets for the Cefiro-and from 1989 minor ECU updates were implemented, creating no significant interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the flat boss on the front of the engine block, just below the cylinder head on the passenger side (Nissan TIS N85-003). The 4th and 5th characters of the VIN for R31 Skyline models are typically 'RB'. The engine is visually identified by its inline-six configuration with a single valve cover and a centrally mounted EFI throttle body on the intake manifold. Critical differentiation from the turbocharged RB20ET: RB20E has no turbocharger, intercooler, or associated plumbing. The intake manifold is also simpler without a boost control solenoid.
The RB20E's primary reliability risk is camshaft and rocker arm wear, with elevated incidence in engines subjected to infrequent oil changes or low-quality lubricants. Nissan service data indicates this is the most common major wear issue for high-mileage units, while its simple design otherwise contributes to exceptional longevity. Neglecting basic maintenance makes proactive oil changes and using the correct specification critical.
Analysis derived from Nissan technical bulletins (1985-1993) and aggregated workshop data. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about NISSAN RB20E.
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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