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2. Compression ratio - Wikipedia

   en.wikipedia.org/wiki/Compression_ratio

   The compression ratio is the ratio between the volume of the cylinder and combustion chamber in an internal combustion engine at their maximum and minimum values. A fundamental specification for such engines, it is measured two ways: the static compression ratio, calculated based on the volume of the cylinder when the piston is at the bottom of ...

3. Engine efficiency - Wikipedia

   en.wikipedia.org/wiki/Engine_efficiency

   Most petrol (gasoline, Otto cycle) and diesel (Diesel cycle) engines have an expansion ratio equal to the compression ratio. Some engines, which use the Atkinson cycle or the Miller cycle achieve increased efficiency by having an expansion ratio larger than the compression ratio. Diesel engines have a compression/expansion ratio between 14:1 ...

4. Hornsby–Akroyd oil engine - Wikipedia

   en.wikipedia.org/wiki/Hornsby–Akroyd_oil_engine

   However, the Hornsby-Akroyd oil engine and other hot-bulb engines are distinctly different from Rudolf Diesel's design, where ignition occurs alone through the heat of compression: An oil engine will have a decent compression ratio between 3:1 and 5:1, where a typical diesel engine will have a much harder achieved compression ratio ranging ...

5. Diesel cycle - Wikipedia

   en.wikipedia.org/wiki/Diesel_cycle

   However, a real diesel engine will be more efficient overall since it will have the ability to operate at higher compression ratios. If a petrol engine were to have the same compression ratio, then knocking (self-ignition) would occur and this would severely reduce the efficiency, whereas in a diesel engine, the self ignition is the desired ...

6. Octane rating - Wikipedia

   en.wikipedia.org/wiki/Octane_rating

   An octane rating, or octane number, is a standard measure of a fuel 's ability to withstand compression in an internal combustion engine without causing engine knocking. The higher the octane number, the more compression the fuel can withstand before detonating. Octane rating does not relate directly to the power output or the energy content of ...

7. Brake-specific fuel consumption - Wikipedia

   en.wikipedia.org/wiki/Brake-specific_fuel...

   BSFC numbers change a lot for different engine designs, and compression ratio and power rating. Engines of different classes like diesels and gasoline engines will have very different BSFC numbers, ranging from less than 200 g/(kW⋅h) (diesel at low speed and high torque) to more than 1,000 g/(kW⋅h) (turboprop at low power level).