The 6.9 and 7.3 diesels are indirect-injection, compression-ignition engines. The 7.3 Powerstroke, as well as the 6.0, 6.4, and new 6.7, the Duramax, and Cummins are direct-injection compression-ignition engines. Gasoline motors are spark-ignition motors. Compression has to be kept low on them to prevent pre-ignition because the fuel is drawn in with the inatake air, before compression. Compression-ignition motors have the fuel injected into the cylinder near TDC (top dead center), eliminating the chance for pre-detonation.
As for combustion temperature, diesel has about 30-35% more BTU per volume than gasoline. So how does the gasoline burn hotter? It doesn't, it burns colder.
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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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