Ok let me be a little clearer. A 7.3 is not a direct injection diesel, an air fuel mix is induced into the chamber by a intake valve. The intake valve opens as the piston is traveling down from the exhaust stroke, sucking the mix into the chamber. The compression on a diesel is so at TDC the mixture ignites. Diesel fuel has a high flash point requiring a higher compression. Gasoline has a much lower flash point requiring less compression, thus igniting before TDC in a 7.3. A gasoline internal combustion engine will destroy itself from preignition over a period of time, low compression. A diesel on average runs 3 times the compression, so it does not take long to destroy it with preingition.
A Duramax on the other hand is a direct injection diesel. Air is the only thing coming thru the intake valve. The diesel fuel is directly injected to the combustion chamber just before TDC. Gasoline would have the same effect in this engine also. Detonating as soon as it was injected.
Lastly the oiling system on a diesel is differet from a gas engine. It is called fuel oil for a reason, it has lubricating properties the engine relys on. Gasoline has no lubricating properties and runs a diesel dry burning up components as it flows thru the system.
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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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