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 - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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