The timing system uses an electric motor to advance/retard the timing on the intake valves. That’s why it sounds like an electronic noise and not a gear noise. This is also why it seems to increase in pitch as you increase RPMs. When the engine is under load like when you’re accelerating, it’s adjusting timing to avoid knock. That’s how the high compression on the skyactive is achieved.
This is just how they sound. My 2.5 NA sounds exactly like you describe.
Alright. I can’t believe no one’s said this yet.
The timing system uses an electric motor to advance/retard the timing on the intake valves. That’s why it sounds like an electronic noise and not a gear noise. This is also why it seems to increase in pitch as you increase RPMs. When the engine is under load like when you’re accelerating, it’s adjusting timing to avoid knock. That’s how the high compression on the skyactive is achieved.
This is just how they sound. My 2.5 NA sounds exactly like you describe.