okay guys. i tried using the search bar and didnt come up with much on the topic. i understand the differences between common rail and mechanical injection, but why is it that the biggest horsepower diesels are all 12 valves and 24 valves and not common rails? and with the greater complexity are common rails more prone to break easily (easier)? and if mechanical injection is the way to go, which one is best, 12v or 24v?

sorry about all the questions. im so hyped about buildin a cool diesel rig i just wanna dive in