What Causes the Abnormal Noise in BMW N20 Engine?

[OEmily]

BMW's N20 engine produces a ticking sound due to vibrations from the high-pressure fuel injectors. Relevant details are as follows: 1. This engine generates particularly loud noise during cold starts, which diminishes after the engine warms up. It's important to note that this noise cannot be completely eliminated; only certain effective measures can be taken to reduce it. 2. The BMW N20 engine incorporates three key technologies: twin-scroll single turbocharging, variable valve lift combined with variable valve timing, and direct fuel injection. The variable valve lift and timing technology offers the advantage of enabling the engine to achieve higher torque at lower RPMs and greater power output at higher RPMs. Additionally, this technology helps reduce vehicle emissions and improves fuel efficiency.