Due to the demand of higher performance with lower consumption and the ever-stricter environmental regulations, carburettors gave way to the implementation of injection, which substantially improved performance with lower consumption and polluting elements. There are two types of injection:
Direct Injection: Whether the engine is petrol or diesel, the injection system is called direct when the fuel is fed directly into the combustion chamber formed by the cylinder head and the piston crown, which is usually designed to encourage the gas’ turbulence, and to thus improve combustion.
Indirect Injection: In indirect injection petrol engines, petrol is fed to the so-called inlet manifold, before the combustion chamber. In indirect injection diesel engines, diesel is injected into a prechamber loacted in the cylinder head and connected to the main combustion chamber inside the cylinder via a small opening. Part of the fuel is burned in the prechamber, which increases the pressure and sends the rest of the unburned fuel to the main chamber, where it meets sufficient air to complete its comubstion.
Constant improvements of the electronic systems that manage injection have resulted in major progress in the performance of petrol and diesel cars by increasing efficiency and reducing consumption, resulting in increased power with fewer polluting elements.
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