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A petrol engine (gasoline engine in American and Canadian English) is an internal combustion engine designed to run on petrol (gasoline). Petrol engines can often be adapted to also run on fuels such as liquefied petroleum gas and ethanol blends (such as E10 and E85 ).
Gasoline can be released into the Earth's environment as an uncombusted liquid fuel, as a flammable liquid, or as a vapor by way of leakages occurring during its production, handling, transport and delivery. [83] Gasoline contains known carcinogens, [84] [85] [86] and gasoline exhaust is a health risk. [75]
The electric cars offered low pollution and a soundless ride, unlike their gasoline counterparts. The greatest downside of electric cars was the range. The typical electric car could reach around 20 miles before requiring a recharge. Manufacturers could not increase the number of batteries, due to the bulkiness of the batteries at the time ...
Gasoline direct injection does not have the valve cleaning action that is provided when fuel is introduced to the engine upstream of the cylinder. [35] In non-GDI engines, the gasoline traveling through the intake port acts as a cleaning agent for contamination, such as atomized oil.
They are also more fuel-efficient in most circumstances and are used in heavy road vehicles, some automobiles (increasingly so for their increased fuel efficiency over gasoline engines), ships, railway locomotives, and light aircraft. Gasoline engines are used in most other road vehicles including most cars, motorcycles, and mopeds.
Mass-produced diesel engines for passenger cars (such as the Mercedes-Benz OM 138) became available in the late 1930s and early 1940s, being the first fuel-injected engines for passenger car use. [1] In passenger car petrol engines, fuel injection was introduced in the early 1950s and gradually gained prevalence until it had largely replaced ...
In a naturally aspirated engine, air for combustion (Diesel cycle in a diesel engine or specific types of Otto cycle in petrol engines, namely petrol direct injection) or an air/fuel mixture (traditional Otto cycle petrol engines), is drawn into the engine's cylinders by atmospheric pressure acting against a partial vacuum that occurs as the piston travels downwards toward bottom dead centre ...
Indirect injection, where the fuel is injected into a swirl chamber or pre-combustion chamber. The fuel ignites as it is injected into this chamber and the burning air/fuel mixture spreads into the main combustion chamber. Direct injection engines usually give better fuel economy but indirect injection engines can use a lower grade of fuel.