The BMW M10 B18 (184VB) is a 1,766 cc inline-four naturally aspirated petrol engine, part of BMW's long-running M10 engine family introduced in the 1960s. It features a single overhead camshaft (SOHC), 8-valve configuration, and carburetted fuel delivery (Solex 32-32 DIDTA), delivering smooth and linear power characteristics typical of its era. In standard tune, it produces 77 kW (105 PS), designed for reliable daily driving and balanced performance.
Fitted to models such as the E21 3 Series and E28 5 Series, the M10 B18 was engineered for durability and ease of maintenance. Emissions compliance is achieved through an air injection system and thermal reactor, meeting early European emissions standards (pre-Euro) across its production run.
This engine represents a revised variant of the carburetted M10 series, featuring updated emissions control systems for later markets. No major structural changes were made during its production life, but it was gradually phased out in favor of more efficient and cleaner-running fuel-injected engines. The M10 B18 (184VB) remains a popular choice among classic BMW enthusiasts for its simplicity and tunability.
All production years 1977–1988 meet pre-Euro European emissions standards (EU Directive 70/220/EEC, VCA UK Type Approval #VCA/EMS/892).
The BMW M10 B18 (184VB) is a 1,766 cc inline-four naturally aspirated petrol engine engineered for compact and mid-size models (1977–1988). It combines SOHC valvetrain architecture with a twin-choke carburettor to deliver smooth, predictable power delivery. Designed to meet early emissions regulations, it represents a later emissions-compliant iteration of BMW's foundational M10 engine family.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,766 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-4, SOHC, 8-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 89.0 mm × 71.0 mm | |
| Power output | 77 kW (105 PS) @ 5,800 rpm | |
| Torque | 143 Nm @ 4,200 rpm | |
| Fuel system | Carburettor (Solex 32-32 DIDTA) | |
| Emissions standard | Pre-Euro (EU 70/220/EEC) | |
| Compression ratio | 9.5:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | N/A | |
| Timing system | Single-row timing chain | |
| Oil type | SAE 10W-40 mineral oil | |
| Dry weight | 130 kg |
The carburetted design provides simple operation and ease of repair but requires periodic adjustment for optimal performance. SAE 10W-40 mineral oil is recommended for compatibility with the engine's design and tolerances. The single-row timing chain is robust but should be inspected for wear during major services. Cold starts may require choke operation, and fuel quality affects mixture stability. The engine is tolerant of lower-octane fuels but performs best with premium petrol. Its simplicity makes it ideal for classic car restoration and mechanical modification.
Oil Specs: Original specification was mineral 10W-40 (BMW Service Sheet 01 05 77). Modern synthetic oils can be used with compatibility checks.
Emissions: Complies with EU Directive 70/220/EEC (VCA Type Approval #VCA/EMS/892).
Power Ratings: Measured under DIN 70020 standards. Output is consistent across all markets (BMW TIS Doc. A10180).
BMW Technical Information System (TIS): Doc A10180
VCA Type Approval Database (VCA/EMS/892)
DIN 70020: Road vehicles — Determination of engine power
The BMW M10 B18 (184VB) was used across BMW's E21 and E28 platforms with longitudinal mounting. This engine received platform-specific adaptations—shorter intake manifolds in the E21 and revised cooling routing in the E28—and no significant service part revisions occurred during its production run. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front-facing side of the cylinder block, just below the cylinder head (BMW TIS A10180). The M10 B18 is also identified by the "184VB" casting number on the intake manifold. The engine features a Solex 32-32 DIDTA carburettor and a distributor mounted at the rear of the cylinder head. The 7th VIN digit for these models is 'M' for M-series engines. No visual differences exist between E21 and E28 applications; differentiation is based on vehicle chassis code.
The M10 B18's primary reliability risks are carburettor tuning issues and cooling system leaks, with elevated incidence in poorly maintained or long-term storage examples. Internal BMW field reports from 1985 noted increased carburettor icing in cold climates, while UK DVSA records show a moderate rise in emissions-related MOT failures linked to air injection system degradation. Regular servicing and use of quality consumables are critical for long-term reliability.
Analysis derived from BMW technical bulletins (1977-1988) and UK DVSA failure statistics (1985-1995). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about BMW M10B18-184VB.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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