BMW E81 E87 LCI E90 E91 E92 120i 320i N43 170HP Bare Engine N43B20AA WARRANTY

Warranty and technical condition of the part

The engine is sold with a 90-day warranty.
The power unit was tested before removal and is in full working order.

Listing details

The offer applies to a bare engine.
The engine is sold without accessories (e.g. alternator, starter motor, manifolds, injectors, turbocharger, etc.).

The BMW E81 E87 LCI E90 E91 E92 120i 320i N43 Engine Bare Block N43B20AA is a used, complete bare engine block designed for popular 1 Series and 3 Series models. This product provides a solid foundation for a professional engine replacement in BMW vehicles from the N43 family, maintaining factory performance characteristics and mechanical compatibility.

Specifications and technical data

• SKU: 0427105
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 0427105
• Substitutable numbers: 11000427105, 0427105, 11000427106, 0427106, 11002450324, 2450324, N43, N43B20, N43B20A
• Fuel type: Petrol
• Number of cylinders: 4
• Category: Engines
• Mileage: 69 000

Technical Specifications of the N43B20AA Block

The offered bare block belongs to the BMW Engines category and represents a modern, four-cylinder gasoline design from the N43 family. The unit is engineered for precise operation in the mid to high RPM range, ensuring smooth power delivery and stable running characteristics.

The engine as a bare block forms the foundation of the drivetrain – the block, crankshaft and piston assembly, and cylinder head create a complete base for further accessory assembly. This solution allows the mechanic to utilize existing accessories from the previous unit, which helps control repair costs and ensures compatibility with the specific vehicle's equipment.

Application in BMW 1 Series and 3 Series Models

The N43B20AA engine is intended for installation in BMW 120i and BMW 320i models of the E81, E87 LCI, E90, E91, and E92 generations. This means structural compatibility with hatchback and sedan/wagon body styles, maintaining correct mounting geometry and integration with the factory gearbox and drivetrain of these models.

The four-cylinder gasoline unit fits well with the character of these cars – it combines reasonable fuel consumption with adequate dynamics, which is important for both daily city driving and highway cruising. For workshops specializing in the BMW brand, such a block is a practical solution for replacing a damaged engine in N43 family cars.

Benefits of Installing a Used Engine Block

Choosing a used bare engine block for your BMW allows for optimized repair costs while maintaining the original engine design. In practice, this means:

• Reduced costs compared to purchasing a complete new engine.
• The ability to reuse existing accessories (after verifying their condition), which simplifies adaptation to the specific vehicle configuration.
• Preservation of the original performance characteristics typical of N43 units used in the BMW 120i and 320i.
• Service flexibility – the workshop can individually select accessory components, replace worn parts, and prepare the engine according to the user's requirements.

Additionally, the presence of dedicated part numbers and interchangeable numbers facilitates compatibility verification with a specific vehicle VIN and the selection of appropriate accompanying components.

Professional Selection and Compatibility Verification

To correctly select the N43B20AA bare block for a specific BMW, it is crucial to check compatibility using the OEM part number and interchangeable numbers. This helps avoid installation issues, accessory differences, or discrepancies in engine control configuration.

If in doubt, it is advisable to consult with a mechanic or a specialized BMW service center that can verify the unit's compatibility with the specific body version, model year, and installed control system. This approach minimizes the risk of additional costs and speeds up the engine replacement process.

Other BMW Engines in This Category

If you are also looking for other BMW engines for various models of this brand, check the available items in the category: BMW Engines. This will allow you to compare different units, select the appropriate construction type, and match the engine to a specific repair or modernization project.

Technical Knowledge and Operation of BMW Units

Before purchasing a block for the 3 Series, it is worth familiarizing yourself with the typical problems and specifics of operating these units. Practical information can be found in the article: Troublesome BMW E90 Engines: Find Out What Can Ruin Your Budget!, which discusses critical areas and helps to consciously plan repairs.

If you are considering different repair strategies and wondering about the cost-effectiveness of buying a used block compared to other solutions, the guide: Original, Aftermarket, or Used – Which Car Parts Are Most Cost-Effective? may also be helpful. This will make it easier to assess how to choose a solution that fits your budget and expected vehicle lifespan.