Originally Posted By: wemay
So, after 800 miles of the 5w30, the 2.4 is back to sounding as it did on the 5w20, baby diesel like. I've learned to like it.
According to Hyundai techs that comment on the Hyundai forums, the slight ticking noise that we hear on the DI engines is attributed to two things: 1-injector solenoids opening / closing, and 2-the high-pressure mechanical fuel pump (the loudest out of the two).
The high-pressure fuel pump is actuated by a cam near the top of the engine and is louder because of it's location and mechanical nature. Note of interest: the fuel is delivered from the tank VIA an electric fuel pump at about 200 + / - PSI. It then gets boosted by the engine-driven fuel pump up to about 2200 PSI + / - at which it get's shot into the cylinders--cool stuff!
Engines are mechanical, comprised of many moving parts. . . oils will to a small extent change / mask some sounds, but unless turbine engines for cars are developed, we're stuck with these noises. . . compared to my 2014 Ford Fusion company car, the Hyundai 2.0T is silent.