The BMW M10 B18 (184KA) is a 1,766 cc, inline-four naturally aspirated petrol engine produced from 1977 to 1988. Part of BMW's long-running M10 engine family, it features a single overhead camshaft (SOHC), 8-valve configuration, and fuel injection (Bosch L-Jetronic). It delivers 84 kW (115 PS) in standard tune with peak torque of 158 Nm.
Fitted to mid-range BMW models including the E21 3 Series and E30 3 Series, the M10 B18 (184KA) was designed as a refined and efficient powerplant for drivers seeking improved performance over carburetted variants. It meets early Euro emissions standards and features a timing chain, cast-iron block, and aluminium head for durability and ease of maintenance.
One documented concern is fuel injector clogging due to fuel system contamination, which can lead to misfires or rough idle. This was addressed in factory service documentation with recommendations for periodic fuel system cleaning. Distributor vacuum advance unit degradation is also common on high-mileage engines, leading to poor throttle response and reduced fuel economy.
Production years 1977–1988 meet Euro 0 to Euro 1 standards (VCA UK Type Approval #VCA/EMS/0185).
The BMW M10 B18 (184KA) is a 1,766 cc inline-four naturally aspirated petrol engine engineered for compact and mid-size models (1977–1988). It combines Bosch L-Jetronic fuel injection with a robust SOHC valvetrain to deliver smooth power delivery and improved drivability over carburetted predecessors. Designed to meet early emissions standards, it represents a key evolution in BMW's transition from mechanical to electronic engine management.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,766 cc | |
| Fuel type | Petrol (Unleaded, 95 RON min) | |
| Configuration | Inline-4, SOHC, 8-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 89.0 mm × 71.0 mm | |
| Power output | 84 kW (115 PS) @ 6,000 rpm | |
| Torque | 158 Nm @ 4,200 rpm | |
| Fuel system | Bosch L-Jetronic fuel injection | |
| Emissions standard | Euro 0 / Euro 1 | |
| Compression ratio | 9.5:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Not applicable | |
| Timing system | Chain (single-row) | |
| Oil type | SAE 10W-40 mineral or semi-synthetic | |
| Dry weight | 148 kg |
The M10 B18 (184KA) offers responsive, linear performance ideal for classic car use but requires regular fuel system maintenance to prevent injector clogging and ensure optimal air-fuel mixture. Timing chain wear is uncommon but should be checked at high mileage. Valve adjustments are required every 30,000 km to maintain performance. Owners should monitor for symptoms of failing fuel injectors—misfires, hesitation, or increased fuel consumption. Use of ethanol-blended fuels is not recommended as it can degrade fuel system seals and O-rings. Cooling system integrity, including the thermostat and radiator, is critical for longevity. This engine is tolerant of basic maintenance and benefits from periodic inspection of the ignition system, particularly the distributor and vacuum advance unit.
Oil Specs: Requires SAE 10W-40 mineral or semi-synthetic oil (BMW Service Bulletin 11 01 77). Modern BMW specifications do not apply.
Emissions: Complies with pre-Euro and Euro 1 standards (VCA Type Approval #VCA/EMS/0185).
Power Ratings: Measured under DIN 70020 standards. Output consistent across fuel qualities meeting 95 RON minimum (BMW TIS Doc. A18402).
BMW Technical Information System (TIS): Doc A18402
BMW ETK Parts Catalogue E12-1841
VCA Type Approval Database (VCA/EMS/0185)
DIN: 70020 Engine Power Measurement Standard
The BMW M10 B18 (184KA) was used across BMW's E21 and E30 platforms with longitudinal mounting. This engine received platform-specific adaptations—different intake manifolds in the E21 and revised exhaust routing in the E30—and from 1982 the high-compression variant with modified camshaft for improved efficiency. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front face of the cylinder block, near the timing cover (BMW TIS A18402). The code "184KA" is typically found on the intake manifold or valve cover. The M10 B18 (184KA) can be visually identified by its Bosch L-Jetronic fuel injection system and distributor-based ignition. Critical differentiation from M10 B18 (184EB): M10 B18 (184KA) has fuel injection and a higher compression ratio; 184EB has a carburettor. Service parts require model-year verification—fuel injectors and manifold assemblies differ between E21 and E30 applications.
The M10 B18 (184KA)'s primary reliability risks are fuel injection system issues and ignition component wear at high mileage. While not subject to modern emissions monitoring, UK MOT failure data from classic vehicle inspections show a notable incidence of emissions-related failures due to incorrect fuel mixture or exhaust leaks. Long-term storage and use of modern ethanol-blended fuels increase the risk of fuel system degradation, making proper maintenance and fuel selection critical for preservation.
Analysis derived from BMW technical documentation (1977–1988) and UK MOT failure statistics for classic vehicles (2018–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about BMW M10B18-184KA.
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