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 c…
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 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.
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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.
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The RB20E is generally very reliable long-term due to its simple, robust SOHC design and non-interference nature. Its main weakness is camshaft and rocker wear, which is almost always preventable with regular oil changes using quality 10W-40 oil. With proper maintenance, these engines can easily surpass 400,000 km without major issues.
The most common serious issue is wear of the camshaft lobes and rocker arms, caused by poor maintenance. Other frequent problems include timing chain tensioner wear causing rattle, electrical faults in the EFI system due to aging connectors, and coolant leaks from the thermostat housing gasket. These are well-documented in Nissan service information.
The RB20E was primarily used in the Nissan Skyline R31 (1985-1993), Nissan Laurel C32 (1985-1993), and Nissan Cefiro A31 (1988-1993). It was the base engine for many variants in these model lines, offering a balance of smoothness and economy.
Yes, but its SOHC 12-valve design is a limiting factor. Basic modifications include a performance exhaust, intake, and ECU remap, yielding modest gains. More significant power requires head work (porting, larger valves) or converting to a DOHC head (RB20DE), which is a complex swap. Forced induction is possible but requires significant supporting modifications.
Fuel economy is reasonable for its era and size. Expect around 9-11 L/100km (25-31 mpg UK) for a Skyline R31 in mixed driving. Highway cruising can yield 7-8 L/100km (35-40 mpg UK), while city driving or aggressive use can push consumption to 13 L/100km (22 mpg UK) or higher.
No. The Nissan RB20E is a non-interference engine. This means if the timing chain were to fail or jump timing, the pistons will not contact the valves, preventing catastrophic internal damage. This is a significant safety feature for such a durable engine.
Nissan originally specified API SF or SG grade oil, typically SAE 10W-40 for normal operating conditions. Modern, high-quality petrol engine oils meeting API SN or SP specifications are excellent upgrades and provide better protection. Regular changes every 5,000-7,000 km are crucial for preventing camshaft wear.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
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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