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Compression ignition engines can easier be made to run lean, meaning they'll havemore air than what's actually needed for the amount of fuel that's present. With excess air,(and higher temperature) it's easier to get more of the fuel burnt. With more of the fuel burnt, there's less unburnt fuel being vented as exhaust, meaning fewer emissions.
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Why does different types of vehicle engines produce different exhaust emissions?
For instance diesel engines use compression for combustion versus spark plugs which are used in everyday vehicle engines. Some engines use different fuels therefore when combustion occurs the exhaust produces emissions based on the fuel mixture.
Why petrol engines produce oxides of nitrogen?
Petrol engines produce oxides of nitrogen (NOx) as a byproduct of combustion at high temperatures. Specifically, nitrogen in the air reacts with oxygen in the engine's combustion chamber to form NOx gases. Factors such as high compression ratios and combustion temperatures can contribute to increased NOx emissions from petrol engines.
Main advantages and disadvantages between compression ignition and spark ignition engines?
A spark ignition engine is a gasoline engine. A compression ignition is a diesel engine.basic difference between compression and spark ignition engine is ,compression ignition is a diesel engine. spark ignition is a gasoline engine.diesel engines compress the fuel to a point where the fuel explodes, thus giving ignitiongasoline does not compress to explosion, therefore it needs need a spark to ignite the fuelspark ign. is gasoline. comp. ign. is diesel.A compression ignition engine is typically a diesel. It compresses air so much that the heat from the compression is enough to cause the fuel to ignited once injected. A spark ignition engine is your average gasoline-burning car engine. It uses a spark plug to ignite the air/fuel mixture instead of relying on compretssion ignition.A compression ignition engine uses very high compression of the air to heat it self up and the fuel is injected into the cylinder which self ignites (a diesel engine is a compression ignition engine).A spark ignition engine uses a lower compression ratio and requires the use of a spark to ignite the fuel (a petrol engine is a spark ignition engine).Because the oils used for a diesel have a higher calorific value, they have a better fuel economy, They also do not need extra energy usage to keep the engine running, unlike the energy that is lost to power the spark plugs from the generator/alternator which is taken from the useful energy produced by the engine.
Engine's compression ratio is greater between 2 stroke and 4 stroke engine?
Typically, a 2-stroke engine has a higher compression ratio compared to a 4-stroke engine. This is because 2-stroke engines can complete a power cycle in just two strokes of the piston, allowing for a more compact design and higher compression. However, the specific compression ratio can vary widely depending on the engine design and application. In general, while 2-stroke engines may have higher ratios, 4-stroke engines tend to be more efficient and produce less emissions.
What are the key differences between unleaded and diesel fuel, and how do these differences impact vehicle performance and efficiency?
Unleaded fuel is used in gasoline engines, while diesel fuel is used in diesel engines. The main difference is in their ignition process: gasoline engines use spark plugs to ignite the fuel, while diesel engines rely on compression to ignite the fuel. This difference affects performance and efficiency, as diesel engines typically have higher torque and better fuel efficiency compared to gasoline engines. Diesel fuel also has a higher energy density, which can result in better mileage for diesel vehicles. However, diesel engines tend to produce more emissions than gasoline engines.
When the ignition system produce high voltage?
At the end of the compression stroke. That's one of the jobs of the crank sensor.
Do petrol engines produce more CO than diesls?
Yes, petrol engines generally produce more carbon monoxide (CO) than diesel engines. This is primarily due to the combustion process; petrol engines often operate at lower temperatures and can produce incomplete combustion, leading to higher CO emissions. In contrast, diesel engines operate at higher temperatures and pressures, which typically results in more complete combustion and lower CO emissions. However, diesel engines tend to emit higher levels of nitrogen oxides and particulate matter.
Why petrol engine not uses compression ignition?
Most gasoline engines are 8:1 - 10:1 compression, while a diesel engine requires closer to 18:1 - 20:1 to achieve the temperature required to ignite the fuel. Simply put an electronic ignition system is less complicated and more cost effective to mass produce. Especially taking into account the emissions requirements for todays "clean" diesels. Gasoline is not ignited using compression ignition for two reasons. First of all, an electronic ignition is simpler and does not require heaver engine parts to increase compression. Secondly gasoline has a much lower flash point than diesel which makes it more volatile and dangerous. As a result, if you compress then ignite it the fuel will burn at a hotter and less controllable rate. If gasoline burns at too hot a temperature it forms Nox gas - "Oxides of Nitrogen" which is a major contributing factor to ozone damage and the greenhouse effect.
Can a engines power be increased while at the same time decreasing its emissions?
Yes, A poorly tuned engine will produce more emissions and less power than a well tuned engine.
What iselectronic ignition and how does it work?
Electronic ignition is a system used in internal combustion engines that replaces traditional mechanical ignition systems. It uses electronic components to control the timing and duration of the spark that ignites the air-fuel mixture in the engine's cylinders. This system typically includes sensors to monitor engine conditions, a control unit to process the data, and ignition coils to produce the spark. By providing more precise control over ignition timing, electronic ignition enhances engine efficiency, performance, and emissions control.
What is the difference between gasoline and diesel fuel?
Gasoline and diesel fuel are both types of fossil fuels used to power vehicles, but they have different chemical compositions and properties. Gasoline is lighter and more volatile, igniting easily in spark-ignition engines. Diesel fuel is heavier and less volatile, requiring higher compression in diesel engines to ignite. Diesel engines are more fuel-efficient but produce more pollutants than gasoline engines.
What is the purpose of diesel engine?
The purpose of a diesel engine is to convert the chemical energy stored in diesel fuel into mechanical energy for powering vehicles and machinery. Diesel engines are known for their efficiency, durability, and ability to produce high torque at low speeds, making them ideal for heavy-duty applications like trucks, buses, and industrial equipment. They operate using compression ignition, where air is compressed to a high pressure and temperature, igniting the injected fuel. This process results in greater fuel efficiency and lower CO2 emissions compared to gasoline engines.
