BMW 316i (E90) 90 kW Engine N43B16A Overview
The BMW N43B16A is a 1.6-liter inline-four naturally aspirated petrol engine that powered the BMW 316i in the E90 3 Series generation. Known for its smooth delivery and efficient performance, the N43B16A engine was designed to balance fuel economy with sufficient power for everyday driving.
Compatibility
| Vehicle Model | Engine Code | Year Range | Power Output | Torque |
|---|---|---|---|---|
| BMW 316i (E90) | N43B16A | 2007–2011 | 90 kW (122 hp) | ~160 Nm (4,250 RPM) |
Engine Overview
The N43B16A is a 1.6-liter inline-four petrol engine with:
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Double VANOS variable valve timing on both intake and exhaust cams, enhancing torque, responsiveness, and efficiency
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A high-pressure direct fuel injection system for better combustion efficiency and lower emissions
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Lightweight aluminum construction for reduced weight and improved handling dynamics
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Designed with European emission standards in mind, meeting Euro 4 and Euro 5 requirements depending on production year
This engine produces 90 kW (122 hp) and around 160 Nm of torque, making it well-suited for urban driving and moderate highway cruising. It offers a smooth power band with good throttle response typical of BMW’s naturally aspirated engines.
Key Specs
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Engine Type: 1.6 L inline-four petrol, naturally aspirated
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Power: 90 kW (122 hp)
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Torque: Approximately 160 Nm (at 4,250 RPM)
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Fuel System: High-pressure direct injection
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Valvetrain: DOHC with Double VANOS variable valve timing
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Fuel Economy: Typically around 6.0–7.0 L/100 km combined
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Emissions Standard: Euro 4 / Euro 5
Reliability and Maintenance
The N43B16A engine requires regular maintenance to ensure reliability:
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Regular oil and filter changes with high-quality synthetic oil are important to prevent premature wear
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The high-pressure fuel injection system should be checked if performance issues arise
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Timing chain tensioners have been known to require attention in some cases — monitoring for unusual noises is recommended
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Spark plugs and ignition coils should be replaced as per BMW’s service schedule to maintain smooth running
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Intake valve carbon buildup can occur, which may require periodic cleaning
With proper care, the N43B16A provides a reliable and economical engine choice for the 3 Series 316i.
Why Choose the N43B16A Engine?
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Balanced power output of 90 kW (122 hp) suitable for daily driving
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Smooth and responsive naturally aspirated petrol performance
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Advanced technologies like Double VANOS and direct injection for efficiency
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Lightweight and compact design complements BMW’s sporty handling
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Meets modern emission standards for cleaner operation
Conclusion
The BMW N43B16A 1.6-liter 90 kW engine in the 316i E90 offers an efficient, refined petrol experience with reliable performance for city and highway use. It’s an ideal choice for drivers looking for a well-rounded engine that combines BMW’s hallmark driving dynamics with modern fuel-saving technologies in the 3 Series sedan from 2007 to 2011.
