Originally Posted by Rzeppa
I have been told that the reason that Toyota's diesels are so quiet and Detroit's are so loud is that Toyota uses indirect injection (precups) and Detroit uses direct injection. I do know that my 1HZ was REALLY nice and quiet, and unlike a powerstroke or cummins, you could actually hold a conversation while standing next to it while the engine was running.
I thought it was the other way around? I thought IDI was louder and DI was quieter. I believe IDI Toyota engines are the B, 3B, H, 2H, 1HZ, 1PZ, 1KZ - and the DI engines are the 13-14-15B, 12H, 1HD, 1KD, and 1VD series.