BMW N45B16 Engine (Design, Specs & Reliability)
Updated: May 25
Based on the N42B18 engine, the small 1.6-liter BMW N45B16 engine produces 116 hp and 150 nm of torque and was created in 2004.
Table of Contents:
Design
The new engine features a new piston, new connecting rods, and a new crankshaft with a shortened piston stroke (it was 81, now 72 mm).
Additionally, the N45B16 does not use the Valvetronic valve lift technology.
Bosch ME 9.2 engine management system Since 2007, the engine has undergone updates, been given a new Bosch ME17.4.5 control unit, and had the moniker N45NB16 appended.
On BMW vehicles a 16i, this engine was used. A 2-liter sports variant of this engine, the N45B20S, was also developed as part of the limited-edition N45 series.
Specs
Production years: 2004-2011
Displacement: 1596 cc
Fuel system: injector
Power output: 116 hp @ 6000 rpm
Torque output: 150 nm @ 4300 rpm
Block material: aluminum R4
Cylinder head: aluminum 16v
Bore: 84 mm
Stroke: 72 mm
Compression ratio: 10.5:1
Features: Bosch ME 9.2 (N45B16), Bosch ME 17.4.5 (N45NB16)
Hydraulic lifters:yes
Timing drive: chain
Phase regulator: double VANOS
Turbocharging: no
Recommended engine oil: 5W-30
Engine oil capacity: 4.5 litres
Fuel type: Petrol
Euro standards: EURO 4/5
Fuel consumption, L/100 km (for 116i E87): city 8.8, highway 4.9, combined 6.2
Engine lifespan: ~320 000 km
Problems & Reliability
It should be noted that this series' power unit has the potential to display fuel mixture detonation. The low quality of the oil or gasoline is the cause.
The oil must only be of the brand and model that BMW recommends. Otherwise, there is a higher chance of creating significant issues; even a significant overhaul is probable.
Knocking
The majority of the time, issues are concealed by a broken timing chain tensioner.
In addition, the chains in general have a short lifespan and are easily stretched after the vehicle has driven roughly 100,000 km. Replacement is necessary.
Vibration
The Vanos system might be malfunctioning and causing the vibrating at idle. It will thus need to be examined and cleaned. Possible replacement in its entirety.
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