Rajan Wilcox
Cetane is a kind of hydrocarbon molecule and an index rating that measures the combustion quality of diesel fuel during compression ignition in the engine. The cetane number reflects how quickly and efficiently diesel fuel will ignite in the engine's combustion chamber. A higher cetane rating leads to maximum engine power and efficiency. The minimum rating for diesel fuel sold in the United States is 40, while diesel engines operate well with a cetane number from 48 to 50. There are several ways to increase the cetane rating of diesel fuel, including adding a chemical with a higher cetane rating or using a cetane booster additive. However, it is important to use enough additive and choose a quality product to avoid potential harm to the engine.
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What You'll Learn
Using additives to increase cetane
Cetane number is an important factor in determining the quality of diesel fuel. It is a measure of the combustion quality of diesel fuel during compression ignition in the engine. The cetane number reflects how quickly and efficiently diesel fuel will ignite in the engine's combustion chamber.
A higher cetane rating leads to maximum engine power and efficiency. A better cetane rating in diesel means the fuel ignites faster in the cylinder, which is an important feature for better functioning in a diesel engine.
There are a number of companies that sell "Cetane Boosters" or "Cetane Improvers". These are additives that are poured into the tank of a diesel-powered vehicle and are supposed to improve the MPG and power, as well as clean and lubricate the injectors, remove water from the tank, and improve the smell of the exhaust.
The most common cetane improvement chemicals are extremely combustible at the high temperatures found in the combustion chamber. If they are present in the fuel, they start burning more quickly than the rest of the fuel, and if one part of the fuel starts burning, it causes the rest of it to join in. Thus, a diesel cetane improver makes the overall fuel blend burn more quickly, and this is why the fuel rates higher on the cetane number test with treatment.
However, the majority of engine manufacturers do not recommend using a cetane-boosting additive at all. Some people are convinced that cetane improvers will promote larger gains in engine performance and reduce engine knock, but this is not true. Higher cetane numbers have very limited benefits with modern diesel engines and could cause more harm than good. One of the few benefits of cetane is its ability to speed up the ignition process in the cylinder, helping with cold-weather engine starting.
Before adding a cetane booster, it is important to check the owner's manual to see if there is any reason not to, such as voiding the warranty. It is also important to use enough additive. If the additive claims to raise the fuel cetane rating by a certain amount, but the treat rate is very low, it is unlikely to be effective.
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The right cetane value for your engine
Understanding Cetane Ratings
Cetane is an index rating that measures the combustion quality of diesel fuel during compression ignition in the engine. It indicates how quickly and efficiently diesel fuel will ignite in the engine's combustion chamber. A higher cetane rating means the fuel ignites faster, leading to improved engine performance.
Minimum Cetane Ratings
The minimum cetane rating for diesel fuel varies depending on your location. In the United States, the minimum rating is 40, while in Europe, the minimum standard is set at 46, and in some countries like Finland, premium diesel fuels have a minimum cetane number of 60. Engine manufacturers also provide recommendations, such as using a cetane rating of 42 in the summer and 46 in the winter for better cold-weather starting.
Engine Type and Performance
The type of diesel engine you have will also determine the right cetane value. Modern common rail diesel engines, for example, have specific requirements. Generally, diesel engines operate well with a cetane number (CN) between 48 and 50. Higher-speed diesel engines tend to perform more effectively with higher cetane number fuels.
Fuel Efficiency and Power
Cetane improvers or boosters are additives that can be used to increase the cetane rating of diesel fuel. These additives are claimed to improve fuel efficiency, enhance engine power, and reduce engine knock. However, it's important to exercise caution as some additives may not be legitimate or could potentially cause harm to your engine. Always refer to your owner's manual and seek advice from reputable sources before adding any additives.
Availability and Cost
When purchasing diesel fuel, it can be challenging to ascertain the cetane rating as it is often not published at the pump. Premium diesel fuels are more likely to have higher cetane ratings, but they also come at an increased cost. It's essential to weigh the benefits of improved engine performance against the potential extra expense.
In summary, determining the right cetane value for your engine involves considering the minimum standards, your engine type, performance requirements, fuel efficiency goals, and the availability and cost of higher cetane fuels or additives. Remember to stay informed, consult experts, and follow manufacturer guidelines to ensure you make the right choices for your specific engine.
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Cetane boosters and fuel economy
Cetane boosters are fuel additives that can be poured into the tank of a diesel-powered vehicle. They are marketed as improving the MPG and power of the engine, as well as cleaning and lubricating the injectors, removing water from the tank, and improving the smell of the exhaust.
The cetane number of a fuel is an important factor in determining the quality of diesel fuel. It is a measure of the combustion quality of diesel fuel during compression ignition in the engine. The cetane number reflects how quickly and efficiently the diesel fuel will ignite in the engine's combustion chamber. A higher cetane rating leads to maximum engine power and efficiency.
The cetane number of a fuel is defined by finding a blend of cetane and isocetane with the same ignition delay. Cetane has a cetane number of 100, while isocetane's measured cetane number is 15. The resulting cetane number is then calculated as a volume-weighted average, rounded to the nearest whole number.
To increase the cetane number of diesel fuel, one can add a higher cetane component to the fuel. The most common cetane improvement chemicals are extremely combustible at the high temperatures found in the combustion chamber. If they are present in the fuel, they start burning more quickly than the rest of the fuel, causing the rest of the fuel to join in. This makes the overall fuel blend burn more quickly, resulting in a higher cetane number.
There are a number of products on the market that claim to boost cetane in diesel fuel, such as Diesel Kleen +Cetane Boost. However, it is important to note that not all additives are created equally, and some may cause more harm than good. Engine manufacturers do not generally recommend using cetane-boosting additives, as they can cause a reduction in overall engine performance if the cetane number is increased too high. Additionally, the benefits of cetane boosters may not outweigh the potential damage they could cause to the fuel system. One of the few benefits of cetane boosters is their ability to speed up the ignition process in the cylinder, helping with cold-weather engine starting.
Furthermore, it is worth considering that diesel fuel with a low cetane rating may not always result in a poor driving experience. While a low cetane rating can lead to poor engine performance, increased emissions, and greater engine noise, it can also provide a slight boost in fuel economy.
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The difference between cetane number and cetane index
Cetane number (CN) is a relative measure of the delay time between the injection of fuel into the combustion chamber and the start of combustion. It is used to predict how easily diesel fuel will ignite and burn when injected into the combustion chamber of a diesel engine. A high cetane number indicates a fuel that burns smoothly in the engine cylinder with a minimum delay between fuel injection and auto-ignition. Cetane numbers are only used for relatively light distillate diesel oils. Cetane numbers are difficult to measure accurately as they require a special diesel engine called a Cooperative Fuel Research (CFR) engine. The resulting cetane number is then calculated by determining which mixture of cetane (hexadecane) and isocetane (2,2,4,4,6,8,8-heptamethylnonane) will result in the same ignition delay. The Ignition Quality Tester (IQT) is another reliable method of measuring the derived cetane number of diesel fuel.
The cetane index is calculated based on the fuel's density and distillation range (ASTM D86). It is simply an estimation of the base (unadditized) cetane number. Cetane index calculations cannot account for cetane improver additives and therefore do not measure the total cetane number for additized diesel fuels. The most common additive is 2-ethylhexyl nitrate (2EHN). The cetane index is used as a substitute for the cetane number of diesel fuel.
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Potential drawbacks of cetane boosters
Cetane boosters are additives that are poured into the tank of a diesel-powered vehicle. They are believed to improve the MPG and power, clean and lubricate the injectors, remove water from the tank, and improve the smell of the exhaust.
However, the potential drawbacks of cetane boosters must be considered:
Firstly, the negative effects of cetane boosters may outweigh the benefits. Engine manufacturers generally do not recommend using cetane-boosting additives. Most cetane improver additives on the market contain alcohol or harmful solvents, which can be extremely detrimental to a fuel system. Alcohol in diesel fuels can cause significant damage to an engine. Therefore, it is crucial to carefully select a cetane booster that does not contain these harmful substances.
Secondly, higher cetane numbers may have limited advantages with modern diesel engines and could potentially cause more harm than good. One of the few benefits of cetane boosters is their ability to speed up the ignition process, aiding in cold-weather engine starting. However, once the engine reaches its normal operating temperature, there is no further gain in engine performance.
Thirdly, the use of cetane boosters may void the warranty of your vehicle. It is important to carefully consult the owner's manual before adding any additives to your fuel. Some manuals may explicitly state that adding substances containing alcohol will void the warranty. Therefore, it is essential to choose a cetane booster that does not contain alcohol to avoid any warranty issues.
Lastly, while cetane boosters can improve the combustion quality of diesel fuel, there are alternative products that can achieve the same goal without the potential drawbacks. Quality products that enhance engine performance, increase fuel economy, and naturally improve combustion quality can eliminate the need for potentially harmful cetane boosters. It is recommended to prioritize these alternatives to ensure the well-being of your engine.
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Frequently asked questions
Cetane is an index rating that measures the combustion quality of diesel fuel during compression ignition in the engine. It reflects how quickly and efficiently diesel fuel will ignite in the engine's combustion chamber.
A higher cetane rating in diesel fuel leads to maximum engine power and efficiency. A low cetane rating can lead to poor engine performance, increased emissions, and greater engine noise.
You can increase the cetane rating of diesel fuel by adding a chemical with a higher cetane rating. Some common additives include toluene, dimethyl ether, and 2-ethyl hexyl nitrate. You can also use commercial "Cetane Booster" additives, although these may not always be effective and can sometimes be harmful.
