When taking an engine running on otto's thermodynamic cycle (the work gained for each cycle is the area inside the P(V) diagramm) against the same load and with optimal running temperature everywhere in its lubrification system : taking a colder air intake means that the mixture can be made leaner because most of the time, (less and less so as A rotary engine is an internal combustion engine, like the engine in your car, but it works in a completely different way than the conventional piston engine. In a piston engine, the same volume of space (the cylinder) alternately does four different jobs -- intake, compression, combustion and exhaust. A rotary engine does these sam­e four The study compared the emissions from a Volkswagen Golf diesel engine to those of a Volkswagen Golf gas engine, and found the diesel engine emitted 13% more carbon dioxide than the gas one. The U.S. Department of Energy reports propane engines emit 13% fewer greenhouse gases than gas engines. So putting the numbers together, diesel engines are
Wärtsilä began development work with dual-fuel gas engines in 1987, the first concept being the gas-diesel (GD) engine with high-pressure gas injection. This was followed by the second generation of gas engines in the early 1990s, when the company introduced spark-ignited (SG) pure gas engines using low pressure gas.
If a trip from one place to another is 50 miles and a gallon of gasoline is necessary to cover that distance in a gasoline vehicle, only 6.5 gallons are necessarily using a diesel engine. The second factor that separates diesel vs gasoline powered engines — a.k.a. “heat engines” — is thermal efficiency.

Fuel costs and efficiency. Due to increased air compression, diesel engines also operate at higher temperatures than gasoline engines. This results in a more efficient conversion of thermal energy to mechanical energy. Diesel engines are about 15–40% more efficient than gas engines and diesel fuel is about 15% cheaper than gasoline.

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    • how does a diesel engine work vs gas