The Nissan CA18S is a 1,809 cc, inline‑four naturally aspirated petrol engine produced between 1983 and 1989. It features a cast iron block, aluminum cylinder head, single overhead camshaft (SOHC), and a two-barrel carburetor. This engine was designed for durability and smooth operation in Nissan's compact and mid-size vehicles of the era.
Fitted to models such as the S12 200SX, A10 Bluebird, and U11 Bluebird, the CA18S was engineered for reliable, economical transportation. It offered a balance of adequate power for its time and good fuel efficiency, making it suitable for daily commuting and general use. Emissions compliance for its production period was met through basic engine management and carburetion tuning.
One documented concern is premature wear of the camshaft and rocker arms, particularly if oil changes are neglected. This issue, referenced in Nissan's internal service documentation, is often linked to the use of incorrect oil viscosity or extended service intervals. The design was eventually superseded by more advanced fuel-injected variants like the CA18i and CA18DE.
Nissan
Production years 1983–1989 meet applicable Japanese and European emissions standards for their respective model years (VCA UK Type Approval data for imported models).
The Nissan CA18S is a 1,809 cc inline‑four naturally aspirated petrol engine engineered for compact and mid‑size sedans and coupes (1983-1989). It combines a durable cast iron block with a simple SOHC valvetrain and carbureted fuel delivery to deliver smooth, reliable performance. Designed to meet the emissions standards of its era, it prioritizes longevity and ease of maintenance over high output.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,809 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 83.0 mm × 83.6 mm | |
| Power output | 72–77 kW (97–104 PS) | |
| Torque | 142–147 Nm @ 3,200 rpm | |
| Fuel system | Hitachi two-barrel downdraft carburetor | |
| Emissions standard | Pre-Euro (Meets 1980s Japanese/European standards) | |
| Compression ratio | 9.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain-driven SOHC | |
| Oil type | SAE 10W-40 (Mineral or Semi-Synthetic) | |
| Dry weight | 135 kg |
The SOHC design provides smooth, linear power delivery ideal for relaxed driving but requires diligent 5,000-7,500 km oil changes to prevent camshaft lobe and rocker arm wear. Using the specified SAE 10W-40 oil is critical due to the engine's reliance on splash lubrication for the valvetrain. The carburetor demands periodic synchronization and cleaning to maintain fuel economy and prevent hesitation. Valve clearances must be checked and adjusted manually every 20,000 km as per Nissan Service Manual SM-CA18-85. Ignition timing should be verified regularly to ensure optimal performance and emissions.
Oil Specs: Requires SAE 10W-40 mineral or semi-synthetic oil (Nissan Service Manual SM-CA18-85). Modern full-synthetics may not provide adequate film strength for older components.
Emissions: Pre-Euro certification applies to all 1983-1989 models (VCA Type Approval data for UK imports). No formal Euro standard existed during primary production.
Power Ratings: Measured under JIS D 1001 standards. Output varies slightly by model application and market (Nissan Group PT-1987).
Nissan Technical Information System: Docs TB-CA18-01, SM-CA18-85
Nissan Electronic Parts Catalog (EPC): Doc. CA18S-001
Japanese Industrial Standards: JIS D 1001 Engine Power Certification
The Nissan CA18S was used across Nissan's A10/U11/S12 platforms with longitudinal mounting. This engine received platform-specific adaptations-carburetor jetting for different altitudes in the U11 and revised engine mounts in the S12-creating minor interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front of the cylinder block, just below the cylinder head (Nissan Service Manual SM-CA18-85). The 8th VIN digit typically indicates engine type ('S' for CA18S in many markets). Visually, it is identified by its single overhead cam cover and the prominent Hitachi two-barrel carburetor on the intake manifold. Critical differentiation from CA18i/DE: CA18S has a carburetor, while CA18i has throttle body injection and CA18DE has dual overhead cams and multi-point injection. Engine mounts and intake manifolds are not interchangeable between CA18S and CA18DE.
The CA18S's primary reliability risk is camshaft and rocker arm wear, with elevated incidence in high-mileage engines or those with poor maintenance. Nissan workshop data indicates this is a frequent cause of valve train noise and reduced performance in neglected engines, while owner reports often cite carburetor issues as a secondary concern. Infrequent oil changes and the use of incorrect oil viscosity make adherence to the factory service schedule critical.
Analysis derived from Nissan technical bulletins (1985-1990) and aggregated owner workshop data (1983-2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about NISSAN CA18S.
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NISSAN Official Site
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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
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