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Old 03-21-2009, 09:20 AM   #2
CamaroSpike23
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diesels work based on.... the diesel cycle as opposed to the Otto cycle for gasoline motors. the way diesel motors operate is by high compression and heat causing the fuel to ignite. there are NA diesels, but they are usually smaller in size. diesels are made FI for the sole purpose of cramming as much air into the cyl as possible and utilizing direct injection, fires the fuel at the exact moment needed prior to combustion. diesels use compression ignition compared to spark ignition like that of a gasoline motor. you can have a N/A diesel, but its not nearly as efficient. diesels are based of high compression... like 14:1, 25:1, and even higher in some instances. with the direct injection the piston is only compressing air until about 10* prior to TDC where the injector fires the fuel into the cyl.
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