The N46B20 is a 2.0L naturally aspirated inline-four gasoline engine produced by BMW from 2004 to approximately 2012; it belongs to the N46 series (an upgraded version of the N42). It features Double-VANOS and Valvetronic variable valve lift systems and is known for its smooth operation and fuel efficiency. It was primarily used in the 18i and 20i models. A later updated version, the N46N, was introduced.
Our products are exported to various parts of the country, and the customers we have worked with have received unanimous praise. The company has invested over 20 million yuan in high-end remanufacturing equipment imported from abroad and a first-class production team in the country. Our warehouse has a total area of over 8000 square meters, with scientific management and sufficient supply of goods.
Specifications
Engine Code: N46B20 (Common variants: N46B20O0, N46B20O1, N46B20U1, N46B20U2, N46NB20, etc.)
Displacement: 1,995 cm³ (2.0 L)
Bore × Stroke: 84.0 mm × 90.0 mm
Compression Ratio: 10.5:1
Cylinder Configuration: Inline-4, aluminum alloy block + aluminum alloy cylinder head
Valve Train: DOHC 16-valve + Double-VANOS + Valvetronic
Fuel System: Multipoint fuel injection (some models feature DISA variable intake manifold)
Charging System: Naturally aspirated
Power Range: Approx. 95–125 kW (129–170 PS)
Torque range: approx. 180–210 Nm
Timing drive: Timing chain
Engine oil capacity: approx. 4.25 L (recommended 5W-30 / 5W-40, BMW LL-01 specification)
Production years: 2004–approx. 2012
Emissions standards: Euro 4 / Euro 5
A long block typically includes core components such as the cylinder block, crankshaft, pistons, connecting rods, cylinder head, and timing system.
OE / OEM Reference Numbers
Common OE numbers (for reference regarding long cylinder blocks, engine assemblies, or major components; actual verification requires checking the VIN):
Common reference numbers for pistons, etc.: 11257551550, etc.
Aftermarket long cylinder blocks are often directly labeled as N46B20 / N46B20A / N46NB20
Complete engine assembly OE numbers may vary by model year and production batch; it is recommended to check the vehicle’s VIN for an accurate match
Note: Parts may differ across power variants (U1/U2/O0/O1/N versions); be sure to confirm the specific code when purchasing
| Model Number | N46B20 |
Main Compatible Models
The N46B20 is primarily installed in the following models (mainly 18i and 20i):
1 Series: E87 / E81 118i, 120i
3 Series: E46 318i / 318Ci / 318ti; E90 / E91 / E92 / E93 318i, 320i
5 Series: E60 / E61 520i
X Series: E83 X3 2.0i; E84 X1 sDrive18i / xDrive18i
Z4: E85 2.0i
The later N46N version offers slightly higher power output and is used in newer models.
| Place of Origin | Guangdong, China |
| Condition | Remanufactured |
| Purpose | for replace/repair |
| Type | Gas / Petrol Engine |
| Power | OEM Standards |
| Quantity (pieces) | 1 - 10 | 11 - 50 | > 50 |
| Lead time (days) | 7 | 15 | To be negotiated |
1. Our remanufactured products use accessories provided by well-known brand suppliers such as VICTORREINZ, SCHAEFFLER, KS KOLBENSCHMIDT GmbH, etc.
2. Our product quality is close to the original factory quality, but the price is only 50-60% of the original engine. We can also provide you with a one-year or 100000 kilometer warranty service for the entire machine, and professional after-sales personnel will follow up with you.
3. We have over 15 years of experience in the production and research of automotive engines, and our technical level and personnel training are very scientific and mature. Customers who have worked with us have expressed their agreement with our products and after-sales service.
4. 2018 It has achieved an annual production capacity of 2200 units and has become a major supplier of high-end engine remanufacturing and parts in China's automotive aftermarket.
5. In April 2021, T/CAAMTB passed the certification company of China Automobile Research and Huacheng. 19-2019 Certification of the management system requirements of gas vehicle parts remanufacturing enterprisesIn October 2021, he became a member of the National Green Manufacturing Technology Standardization Committee and participated in the drafting of the Technical Specification for Assembly of Remanufacturing Mechanical and Electrical Products.
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