The Honda B20A7 is a 1,955 cc, inline‑four naturally aspirated petrol engine produced between 1987 and 1991. It features a dual overhead camshaft (DOHC) layout with 16 valves and Honda's PGM‑FI fuel injection system. This configuration delivered approximately 110 kW (150 PS) and 180 Nm of torque, providing a sportier character than its 12-valve A-series counterparts.
Fitted primarily to the third‑generation Honda Prelude (BA chassis) and certain Accord models in specific markets, the B20A7 was engineered for responsive performance and higher-revving capability. Emissions compliance for its production period was managed through precise fuel metering and ignition control, meeting the applicable standards for European and other international markets.
One documented service consideration involves the water pump, where premature bearing failure can occur, potentially leading to coolant leaks or engine overheating. This is addressed in Honda Service Bulletin 92‑045, which details inspection criteria and recommends replacement with an updated design unit for affected engines.
Honda
Production years 1987–1991 meet the emissions standards applicable for their respective model years and markets (VCA UK Type Approval #VCA/EMS/5679).
The Honda B20A7 is a 1,955 cc inline‑four naturally aspirated petrol engine engineered for sporty coupes and sedans (1987-1991). It combines DOHC 16-valve architecture with PGM-FI electronic fuel injection to deliver a broad, high-revving powerband. Designed to meet the emissions regulations of its production era, it prioritizes driver engagement and mechanical precision.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,955 cc | |
| Fuel type | Petrol | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 81.0 mm × 95.0 mm | |
| Power output | 110 kW (150 PS) @ 6,200 rpm | |
| Torque | 180 Nm @ 5,000 rpm | |
| Fuel system | Honda PGM-FI (Programmed Fuel Injection) | |
| Emissions standard | Applicable standards for 1987-1991 models | |
| Compression ratio | 9.4:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Belt-driven | |
| Oil type | API SF/SG, SAE 10W-40 | |
| Dry weight | 150 kg |
The DOHC 16-valve design offers a responsive, high-revving character ideal for spirited driving. Strict adherence to the 90,000 km timing belt replacement interval is critical, as this is an interference engine. Using the specified API SF/SG grade oil ensures proper lubrication for the hydraulic lifters. The water pump, driven by the timing belt, is a known wear item; replacement is often recommended concurrently with the timing belt per SIB 92-045 to prevent future coolant-related failures.
Oil Specs: Requires API SF/SG specification oil (Honda Owner's Manual 1989). Modern equivalents (e.g., API SN) are generally acceptable if viscosity (10W-40) is maintained.
Emissions: Certification applies to 1987-1991 models for their respective markets (VCA Type Approval #VCA/EMS/5679). Specific standards vary by region.
Power Ratings: Measured under SAE J1349 standards (Honda Group PT-1990). Output figures are for stock, unmodified engines.
Honda Technical Information System (TIS): Docs H87656, H87657
Honda Service Information Bulletin (SIB): 92-045
VCA Type Approval Database (VCA/EMS/5679)
SAE International: J1349 Engine Power Certification Standards
The Honda B20A7 was used across Honda's BA platforms with longitudinal mounting. This engine received minor platform-specific adaptations, such as accessory bracket variations between the Prelude Si and Accord variants. All adaptations are documented in OEM technical bulletins.
The engine code "B20A7" is stamped on the front face of the engine block, just below the cylinder head and to the right of the water pump (Honda TIS H87656). The 8th digit of the VIN for vehicles equipped with this engine is typically "F". Visually, it can be identified by its black valve cover with "DOHC 16 VALVE" embossed on top. Critical differentiation from the similar B20A5: The B20A7 features PGM-FI fuel injection and higher compression, while the B20A5 often uses a different ECU and lower compression for specific markets. Service parts like the intake manifold and pistons are specific to the B20A7.
The B20A7's primary reliability consideration is the timing belt and associated water pump, with elevated incidence of failure if neglected. Honda service data indicates a significant number of engines suffered damage due to missed belt changes, while general mechanical robustness is well-documented. Adherence to the strict 90,000 km replacement interval is non-negotiable for long-term health.
Analysis derived from Honda technical bulletins (1989-1993) and general service data. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about HONDA B20A7.
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Regulation (EC) No 715/2007
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