| BMW N46 engine | |
| Production: | 2004-2015 |
| Configuration: | Inline-4 |
| Head: | Aluminium |
| Block: | Aluminium |
| Valvetrain: | DOHC, with VVT & VVL |
| Fueltype: | Petrol |
| Displacement: | 1796cc 1995cc |
| Bore: | 842NaN2 |
| Stroke: | 812NaN2 902NaN2 |
| Predecessor: | BMW N42 |
| Successor: | BMW N43 |
The BMW N46 is a naturally aspirated inline-four piston engines which replaced the BMW N42 and was produced from 2004 to 2015.[1]
The N46 serves as the basis for the smaller BMW N45 engine (which does not have Valvetronic).
In 2007, the N46's successor - the BMW N43 - was introduced. However, the direct-injected N43 was not sold in countries with high-sulfur fuel, so the N46 continued to be produced alongside the N43. The N46 continued production until 2015, when the last N46 models were replaced by the BMW N13 turbocharged four-cylinder engine.
Compared with its N42 predecessor, the N46 features a revised crankshaft, intake manifold[2] and valvetrain.[3] In 2007, the N46 was updated, which was known as the N46N. Changes included the intake manifold, exhaust camshaft and the engine control unit was changed from Bosch Motronic version ME9.2 to version MV17.4.6. The redline is 6,500 rpm.[4]
| Version | Displacement | Power | Torque | Year |
|---|---|---|---|---|
| N46B18 | 17961NaN1 | 850NaN0 at 5,500 rpm | 1750NaN0 at 3,750 rpm | 2004 |
| N46B20U1 | 19951NaN1 | 950NaN0 at 5,750 rpm | 1800NaN0 at 3,250 rpm | 2005 |
| N46B20U2 | 1000NaN0 at 5,750 rpm | 1800NaN0 at 3,250 rpm | 2007 | |
| N46B20U0 | 1050NaN0 at 6,000 rpm | 2000NaN0 at 3,750 rpm | 2007 | |
| N46B20O1 | 1100NaN0 at 6,200 rpm | 2000NaN0 at 3,600 rpm | 2004 | |
| 2000NaN0 at 3,750 rpm | ||||
| N46NB20 | 1270NaN0 at 6,400 rpm | 2100NaN0 at 4,100 rpm | 2007 |
The N46B18 has a 17961NaN1 displacement and produces 850NaN0 and 1750NaN0.[5]
Applications:
The N46B20U0 produces 1050NaN0 and 2000NaN0.
The N46B20U1 produces 950NaN0 and 1800NaN0.
Applications:
The N46B20U2 produces 1000NaN0 and 1800NaN0. It was used instead of the N43 engine in countries with high-sulfur fuel.
Applications:
The N46B20A produces 1050NaN0 and 2000NaN0.
Applications:
The N46B20O1 produces 1100NaN0 and 2000NaN0. On models with secondary air injection, peak torque occurs at 3750 rpm instead of 3600 rpm.
Applications:
The N46B20 produces 1270NaN0 and 2100NaN0. It was used instead of the N43 engine in countries with high-sulfur fuel.
Applications:
N46B20 engine number key code: https://i.imgur.com/IoIFgTP.jpg
