The Honda A20A2 is a 1,956 cc, inline‑four naturally aspirated petrol engine produced between 1986 and 1989. It features a single overhead camshaft (SOHC) with 12 valves and Honda's PGM — FI electronic fuel injection system. This design prioritized smooth power delivery and fuel efficiency for its era, producing 86 kW (117 PS) and 162 Nm of torque.
Fitted primarily to the third — generation Honda Accord (CA series) and Vigor models, the A20A2 was engineered for refined, eco…
Honda
Production years 1986–1989 meet applicable Japanese 1986 Emissions Standards and US EPA Tier 0 regulations for its model year (Honda Emissions Certification Docs).
The Honda A20A2 is a 1,956 cc inline‑four naturally aspirated petrol engine engineered for mid‑size sedans (1986-1989). It combines PGM-FI electronic fuel injection with a 12-valve SOHC layout to deliver smooth, linear power delivery and dependable fuel economy. Designed to meet late-1980s emissions standards, it balances everyday drivability with mechanical simplicity.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,956 cc | |
Fuel type | Petrol | |
Configuration | Inline‑4, SOHC, 12‑valve | |
Aspiration | Naturally Aspirated | |
Bore × stroke | 81.0 mm × 95.0 mm | |
Power output | 86 kW (117 PS) @ 5,500 rpm | |
Torque | 162 Nm @ 4,000 rpm | |
Fuel system | Honda PGM-FI (Programmed Fuel Injection) | |
Emissions standard | Japanese 1986 Standards / US EPA Tier 0 | |
Compression ratio | 9.3:1 | |
Cooling system | Water‑cooled | |
Turbocharger | None | |
Timing system | Chain-driven | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 148 kg |
The Honda A20A2 was used across Honda's CA platform with longitudinal mounting. This engine received platform-specific adaptations-reinforced engine mounts for the Accord and a different intake manifold for the Vigor-creating minor service part variations. All adaptations are documented in OEM technical bulletins.
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The A20A2's primary documented reliability concern is balance shaft bearing wear, with elevated incidence in high-mileage or poorly maintained examples. Honda service data indicated a notable number of repairs were required after 150,000 km, while owner reports frequently cite vibration as a precursor. Infrequent oil changes and use of incorrect viscosity make bearing failure more likely.
Analysis derived from Honda technical bulletins (1986-1989) and aggregated owner repair data (1990-2000). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The A20A2 is generally robust with a simple, non-interference design. Its main weakness is balance shaft bearing wear, which is manageable with good maintenance. Regular oil changes and addressing the balance shaft issue if it arises can lead to very high mileage. Overall, it's known for dependable, if not exciting, service.
The most frequent issues are worn balance shaft bearings causing vibration, failing distributor/ignition modules leading to misfires, coolant leaks from the thermostat housing or water pump, and cracked exhaust manifolds. These are well-documented in Honda service literature.
The A20A2 was used in the third-generation Honda Accord (CA4 chassis, 1986-1989) and the contemporary Honda Vigor (CA5 chassis, 1986-1989), primarily in higher trim levels like the LX and SE-i that featured fuel injection.
Significant power gains are difficult. Basic mods like a free-flow exhaust and air filter offer minor improvements. The SOHC 12-valve head is a major restriction. Swapping to a B-series or H-series engine is a more common path for performance enthusiasts seeking substantial power increases.
For its time, it was economical. In a 1987 Accord, expect around 9.0-10.0 L/100km (26-28 mpg US / 31-34 mpg UK) in combined driving. Highway cruising can yield better figures, around 7.5 L/100km (31 mpg US / 38 mpg UK). Actual figures depend heavily on condition and driving style.
No. The Honda A20A2 is a non-interference engine. If the timing belt fails, the pistons will not contact the valves. This is a significant safety feature, preventing catastrophic engine damage from a broken belt, though replacement is still critical for engine operation.
Honda originally specified API SF or SG grade oil, typically in 10W-40 viscosity. Modern high-quality 10W-40 or 5W-40 synthetic or semi-synthetic oils meeting API SN or higher standards are excellent choices and provide better protection, especially for the balance shaft bearings.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
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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