2006-10-19 14:28:05 · 7 answers · asked by noez_ajah 1 in Science & Mathematics ➔ Engineering
The diesel engine is a compression-ignition engine, which means that the fuel/air mixture is compressed to a point where the heat of compression ignites the mixture. This results in higher compression ratios than gasoline engines.
For equal compression ratios, an air-standard diesel cycle is less efficient than an Otto cycle (thermodynamic cycle used to model spark-ignited gasoline engines).
2006-10-20 04:45:34 · answer #1 · answered by goldnwhite 3 · 0⤊ 0⤋
Compression.
The diesel starts out with much more pressure on the piston even before the fuel is ignited. The diesel fuel also burns slower and provides more force for a longer time on the power stroke. More heat generated from the expanding fuel is converted to mechanical energy and not wasted nearly as much as in a gasoline engine.
2006-10-19 21:41:51 · answer #2 · answered by LeAnne 7 · 0⤊ 0⤋
*Diesel fuel is denser and contains more energy, about 15% more then gas engines.
*Boost pressures can be higher on diesels than gasoline engines, and the higher compression ratio allows a diesel engine to be more efficient than a comparable spark ignition engine.
2006-10-19 21:40:01 · answer #3 · answered by nighthawk_842003 6 · 0⤊ 0⤋
Diesel fuel has a higher calorific value than petrol so for a given amount of each, the diesel will produce more heat = more energy
2006-10-20 11:04:25 · answer #4 · answered by Daddybear 7 · 0⤊ 0⤋
generally a diesel engine is high compression, they can be 25:1.
A normal gas engine is lower compression, usually 8-10:1.
A diesel has to be heavier duty to withstand the higher pressure and additional torque created.
2006-10-19 21:37:42 · answer #5 · answered by Anonymous · 0⤊ 0⤋
I just heard that it (diesel) burns hotter ,so uses less fuel .
2006-10-19 21:31:24 · answer #6 · answered by laRaine 2 · 0⤊ 0⤋
Less moving parts.
2006-10-19 21:29:30 · answer #7 · answered by Anonymous · 0⤊ 0⤋