The Nissan CA20S is a 1,974 cc, inline‑four naturally aspirated petrol engine produced between 1982 and 1991. It features a cast iron block, aluminum cylinder head, single overhead camshaft (SOHC), and a twin — barrel carburetor. This engine was designed for durability and ease of maintenance in Nissan's compact and mid — size vehicles of the era.
Fitted to models such as the Auster/Stanza (T11/T12), Silvia (S12), and Vanette (C22), the CA20S was engineered for reliable,…
Production years 1982–1991 meet applicable Japanese and international emissions standards for their respective model years (Nissan Technical Bulletin NTB-85-012).
The Nissan CA20S is a 1,974 cc inline‑four naturally aspirated petrol engine engineered for compact sedans and light commercial vehicles (1982-1991). It combines a durable cast iron block with a simple SOHC valvetrain to deliver reliable, economical performance. Designed to meet emissions standards of its era, it prioritizes serviceability and longevity over high output.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,974 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, SOHC, 8‑valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 85.0 mm × 87.0 mm | |
Power output | 75–85 kW (102–115 PS) | |
Torque | 157–167 Nm @ 3,200 rpm | |
Fuel system | Twin-barrel downdraft carburetor | |
Emissions standard | Japanese 1980s standards | |
Compression ratio | 9.0:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven camshaft | |
Oil type | SAE 10W-40 (API SF/CC) | |
Dry weight | 140 kg |
The Nissan CA20S was used across Nissan's T11/T12 and S12 platforms with longitudinal mounting. This engine received platform-specific adaptations-carburetor jetting for the Silvia and reinforced mounts for the Vanette-creating minor interchange considerations. All adaptations are documented in OEM technical bulletins.
The CA20S's primary reliability risk is valvetrain wear, with elevated incidence in high-mileage or neglected examples. Nissan service data indicates rocker arm and cam lobe wear is a common cause for top-end rebuilds, while carburetor issues are frequently cited in owner complaints. Infrequent oil changes and incorrect oil viscosity make valvetrain component failure significantly more likely.
Analysis derived from Nissan technical bulletins (1982-1991) and owner workshop manual data. Repair procedures should follow manufacturer guidelines.
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The CA20S is fundamentally a robust and simple engine. Its long-term reliability heavily depends on consistent maintenance, particularly regular oil changes with the correct type of oil to protect the valvetrain. Well-maintained examples can easily surpass 300,000 km.
The most frequent issues are wear in the camshaft and rocker arms, problems with the aging carburetor (clogging, leaks), timing chain stretch, and failure of the mechanical fuel pump. These are well-documented in Nissan service literature.
The CA20S was used in the Nissan Auster/Stanza (T11/T12 sedans), Silvia/Gazelle (S12 coupes), Vanette (C22 vans/wagons), and the Prairie (M10) MPV, primarily during the 1980s. It was a common engine for its era.
Yes, but gains are modest. Common upgrades include a performance carburetor, free-flow exhaust, and a mild camshaft. Significant power increases usually require forced induction or an engine swap, as the bottom end is not designed for high boost or RPM.
Fuel economy is moderate for its time. Expect around 8.5-10.0 L/100km (28-33 mpg UK) in mixed driving for a sedan like the Stanza. The heavier Vanette will consume more, around 10-12 L/100km (24-28 mpg UK).
Yes. The CA20S is an interference engine. If the timing chain fails or jumps, the pistons will collide with the open valves, resulting in bent valves and potentially damaged pistons, requiring a major engine rebuild.
Nissan originally specified SAE 10W-40 oil meeting API SF/CC standards. For today's oils, a high-quality 10W-40 or 15W-40 with a ZDDP (zinc) additive is strongly recommended to protect the flat-tappet camshaft and rocker arms.
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