Answer :
a) The common rail diesel fuel injection system provides better control, higher pressures, and reduced noise compared to the distributor type system in delivering fuel to diesel engines.
b) Incorrect injection timing in a compression ignition system can lead to consequences such as pre-ignition, knocking, reduced power output, increased emissions, and poor fuel efficiency.
c) Methanol features a high octane rating, availability, lower carbon content, compatibility with existing engines, and potential for reducing dependence on fossil fuels, but it also poses challenges related to energy content, corrosiveness, and toxicity.
Compare and contrast the common rail diesel fuel injection system with distributor type conventional diesel fuel injection system?
a) The common rail diesel fuel injection system and distributor type conventional diesel fuel injection system are two different approaches to delivering fuel in diesel engines. In a common rail system, fuel is stored at high pressure in a common rail and injected into each cylinder individually through electronically controlled injectors. This allows for precise control over fuel injection timing and quantity. In contrast, the distributor type system uses a mechanical distributor to distribute fuel to each cylinder simultaneously. The common rail system provides better control, improved fuel atomization, higher injection pressures, and reduced noise compared to the distributor type system.
b) Incorrect injection timing in a compression ignition system can have several consequences. If the injection timing is advanced, it can lead to pre-ignition, where the fuel ignites too early in the combustion process. This can cause knocking, increased cylinder pressures, and potential engine damage. On the other hand, if the injection timing is delayed, it can result in late ignition or incomplete combustion, leading to reduced power output, increased emissions, and poor fuel efficiency. Incorrect injection timing can also affect the engine's overall performance, combustion stability, and emissions levels.
c) Methanol has several features as an alternative fuel for automobiles. It has a high octane rating, which enables efficient combustion and power output. Methanol is also readily available, can be produced from various feedstocks, and has a lower carbon content compared to gasoline or diesel, making it potentially less harmful to the environment. It can be used in existing internal combustion engines with minor modifications, and its use can help diversify fuel sources and reduce dependence on fossil fuels. However, there are challenges associated with methanol, such as its lower energy content compared to gasoline, increased corrosiveness, and higher toxicity, requiring appropriate handling, storage, and safety measures.
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