A diesel engine provides excellent fuel economy and high thermal efficiency, but combustion noise is relatively high. Which combustion chamber design is most likely used?
Direct injection chamber with fuel injected into the main chamber
The clues are excellent fuel economy, high thermal efficiency, and relatively high combustion noise.
A direct injection chamber sprays fuel straight into the main cylinder, so there is no throttling loss in a connecting throat and heat loss to a separate chamber is minimal, giving high efficiency and good economy.
Because combustion starts rapidly in the open chamber, the pressure rises sharply and the engine is noisier than divided-chamber designs.
Pre-combustion, swirl, and air-cell chambers are divided types that run quieter but lose some efficiency, so they do not fit the described behaviour.
Hence, the answer is Direct injection chamber with fuel injected into the main chamber.
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Theoretically, ignition in an engine should occur at:
In a Distributor less ignition system the distributor is replaced by:
In distributor-less ignition systems, ignition can be adjusted manually by:
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