Well, yeah I understand how diesel engines work, with the higher compression igniting the fuel without spark; but if the 7.3 liter international engine in my F250 has glow plugs, and really will not start well without them, then how is it that a DT360 (5.9 liters) international (and the 5.9 cummins) doesn't need them? Heck, even my DT466 (7.6 liters) is only slightly larger than my F250's 7.3 engine. And again, I will reitterate that the Ford Powerstroke diesels (6.9 and 7.3 liters) use glowplugs, and have direct injection and these engines are used in Ford pickup trucks and in International school buses. Same goes for the older 7.3 IDI engines. I just don't get it...
Ah well, it doesn't really matter. Just an academic question really. But inquiring minds want to know!