|Thermodynamics and Propulsion|
pressure) when the compression is complete, and there is ignition
without a spark. An idealized Diesel engine cycle is shown in
This cycle can operate with a higher compression ratio than the Otto cycle because only air is compressed and there is no risk of auto-ignition of the fuel. Although for a given compression ratio the Otto cycle has higher efficiency, because the Diesel engine can be operated to higher compression ratio, the engine can actually have higher efficiency than an Otto cycle when both are operated at compression ratios that might be achieved in practice.
When and where do we use and ? Some definitions use . Is it ever ? (MP 3.8)
Explanation of the above comparison between Diesel and Otto. (MP 3.9)