The Honda EN2 is a 1,343 cc, inline‑three naturally aspirated petrol engine produced between 1985 and 1988. It features a single overhead camshaft (SOHC) 6‑valve layout and Honda's PGM‑FI fuel injection system. This compact configuration, known for its smooth idle and frugal fuel consumption, enabled a specific output of approximately 75 PS per litre, delivering adequate power for urban mobility.
Fitted primarily to the European‑spec Honda City (AA chassis), the EN2 was engineered for efficient, economical city transportation. Emissions compliance for its production era was managed through precise fuel metering and ignition timing, meeting applicable national standards for non‑catalyst equipped variants depending on the specific market and model year.
One documented engineering focus was minimizing engine vibration inherent in three-cylinder designs, addressed through specific crankshaft counterweight and engine mount configurations as detailed in Honda Service Bulletin 86‑015. Later EN variants, like the EN4, incorporated minor ECU revisions for improved emissions control.
Production years 1985–1988 meet applicable national emissions standards for their respective markets and model configurations (e.g., catalyst vs. non-catalyst).
The Honda EN2 is a 1,343 cc inline‑three naturally aspirated petrol engine engineered for compact city cars (1985-1988). It combines SOHC 6-valve architecture with PGM-FI electronic fuel injection to deliver smooth, economical performance. Designed to meet the emissions standards of its era, it prioritizes low running costs and maneuverability.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,343 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑3, SOHC, 6‑valve | |
| Aspiration | Naturally Aspirated | |
| Bore × stroke | 75.0 mm × 76.0 mm | |
| Power output | 76 PS (56 kW) @ 6,000 rpm | |
| Torque | 10.8 kgf·m (106 Nm) @ 4,500 rpm | |
| Fuel system | Honda PGM-FI (Programmed Fuel Injection) | |
| Emissions standard | Market-specific (Pre-Euro) | |
| Compression ratio | 9.3:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Belt-driven SOHC | |
| Oil type | 10W-40 API SG/SH (Mineral/Semi-Synthetic) | |
| Dry weight | Not specified in primary sources |
The three-cylinder design provides excellent fuel economy but requires a timing belt replacement every 80,000 km to prevent catastrophic failure. Using the specified 10W-40 oil is recommended for optimal lubrication. The engine is sensitive to ignition timing; incorrect settings can lead to rough idle or reduced power. The balance shaft system, designed to counteract inherent three-cylinder vibrations, should be inspected for wear during major services. Fuel injectors may require periodic cleaning to maintain spray pattern integrity.
Oil Specs: Requires 10W-40 API SG/SH specification (Honda Owner's Manual AA). Modern equivalents meeting API SL/SM are acceptable if viscosity is correct.
Emissions: Certification varies by market and model (catalyst/non-catalyst). No unified Euro standard applied during 1985-1988 production (Honda EPC H-EN2-85).
Power Ratings: Measured under JIS D 1001 standards. Output figures are for the European-spec variant (Honda Group PT-1987).
Honda Technical Information System (TIS): Workshop Manuals AA
Honda Electronic Parts Catalogue (EPC): Doc. H-EN2-85
Honda Service Bulletin Database: SB 86-015
Japanese Industrial Standards: JIS D 1001 Engine Power Measurement
The Honda EN2 was used exclusively across Honda's AA platform with transverse mounting and was not licensed to other manufacturers. This engine received minor platform-specific adaptations-primarily in accessory bracket positioning for the City-and no major facelift revisions occurred during its production run, ensuring good interchangeability within its model years. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front of the cylinder block, just below the exhaust manifold (Honda Workshop Manual AA). The 8th digit of the VIN for AA chassis is 'E' for the EN engine family. The EN2 is visually identified by its black valve cover with "SOHC 6 VALVE" cast into it and the presence of a distributor on the cylinder head. The intake manifold features a single, compact plenum. Critical differentiator from EN4: The EN2 uses a different ECU (PG6) and has a slightly different intake manifold runner design. Service parts like the cylinder head and intake manifold are generally interchangeable between EN2 and EN4.
The EN2's primary reliability consideration is the timing belt, with failure resulting in immediate engine damage. Honda service data indicates that neglecting the 80,000 km replacement interval is the leading cause of major engine failure. High-mileage operation and infrequent oil changes amplify wear on the valve train and main bearings, making adherence to maintenance schedules critical.
Analysis derived from Honda technical bulletins (1985-1989) and aggregated workshop repair data. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about HONDA EN2.
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Regulation (EC) No 715/2007
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