Rajan Wilcox
Diesel engines are known for their fuel efficiency, but there are several ways to further improve fuel economy. This is particularly relevant for those with aspirated diesel engines, which are less efficient than turbo-diesel engines. One of the most effective ways to improve fuel efficiency is to reduce drag. This can be achieved by installing vortex generators, fairings, side skirts, and wheel covers, among other things. Another way to improve fuel economy is to reduce aggressive driving behaviours such as rapid acceleration and sudden braking, which can lower fuel economy by up to 40%. Maintaining a consistent speed by using cruise control can also help, as can removing unnecessary weight from the vehicle. Ensuring that the vehicle is well-maintained, with regular oil changes, clean fuel injectors, and properly inflated tires, will also improve fuel efficiency.
| Characteristics | Values |
|---|---|
| Engine maintenance | Regularly replace air filters, fuel injectors, and spark plugs. |
| Fuel quality | Use high-quality diesel with additives to enhance engine performance and improve fuel efficiency. |
| Driving habits | Avoid rapid acceleration, sudden stops, and idling. Utilize cruise control to maintain a constant speed. |
| Tire pressure | Maintain optimal tire pressure as recommended by the manufacturer. Under-inflated tires increase rolling resistance, while over-inflated tires affect traction and wear patterns. |
| Vehicle weight | Remove unnecessary weight and clutter to reduce fuel consumption. |
| Route planning | Opt for efficient routes with smoother roads and less traffic to maintain fuel usage. |
| Aerodynamics | Reduce aerodynamic drag by removing external loads such as bike racks and closing windows when driving at high speeds. |
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What You'll Learn
- Reduce drag with vortex generators, fairings, side skirts, and wheel covers
- Avoid aggressive driving behaviours like rapid acceleration and sudden braking
- Maintain optimal tyre pressure and remove unnecessary weight
- Use high-quality diesel fuel with lubricants and detergents
- Regularly service your vehicle and replace worn-out parts
Reduce drag with vortex generators, fairings, side skirts, and wheel covers
Reducing drag is one of the most widely accepted ways to improve fuel efficiency in vehicles, especially in trucking fleets. Side skirt vortex generators, fairings, side skirts, and wheel covers are all methods used to reduce drag.
Vortex Generators
Vortex generators are small aerodynamic devices that can be positioned on a tractor or trailer to help maintain steady airflow when the vehicle is in motion. They cut wind resistance and aerodynamic drag, which are key factors in how much fuel a vehicle uses. They were originally developed for use on airplane wings, but they are now used on cars to improve aerodynamics and stability. When placed at a 50-degree angle on the lower edges of the car's side skirts, vortex generators can cut drag significantly by improving airflow and reducing air disturbance and turbulence.
Fairings
Fairings are another aerodynamic device that can be added to semi-trucks to promote fuel efficiency. They are often sold as part of a package that includes wheel covers and side and top trailer fairings.
Side Skirts
Side skirts are another device that helps to reduce drag by improving airflow around the vehicle. Tests have shown that flap-type side skirts can cut drag by 5.4%, and side deflectors can save up to 1.5% fuel.
Wheel Covers
Wheel covers are also available as part of a fuel-saving aerodynamic kit for semi-trucks. They are designed to improve fuel efficiency by reducing drag.
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Avoid aggressive driving behaviours like rapid acceleration and sudden braking
Aggressive driving behaviours such as rapid acceleration and sudden braking can significantly impact the fuel economy of an aspirated diesel engine. To improve fuel efficiency, it is essential to adopt a smoother and more gentle driving style. Here are some specific tips to help you achieve this:
Maintain a steady speed
Keeping a consistent speed is crucial for improving fuel mileage. When your speed varies, your engine has to work harder to adjust, resulting in increased fuel consumption. Using cruise control on highways or long stretches of road can help maintain a constant speed without requiring you to constantly adjust the accelerator pedal. This can lead to notable improvements in fuel efficiency.
Avoid rapid acceleration
Aggressive acceleration can hurt your diesel engine's fuel mileage. Instead, aim for a smooth and steady acceleration to prevent excessive fuel burning. Lower RPMs will also contribute to better fuel efficiency. When merging onto a highway or interstate, you may need to accelerate quickly for safety reasons. However, whenever possible, opt for a gradual acceleration to optimize fuel economy.
Practice gentle braking
Sudden or aggressive braking can also negatively impact your fuel economy. Smooth and gentle braking allows the engine to work more efficiently and minimizes wear and tear on your vehicle. This is especially relevant in stop-and-go traffic, where aggressive braking can decrease fuel economy significantly.
Reduce idling
Idling, or leaving your engine running when your vehicle is stationary, wastes fuel and leads to reduced fuel efficiency. Whenever you anticipate being stopped for an extended period, such as at a red light or when waiting for someone, consider turning off your engine. This simple habit can improve your overall fuel economy.
Maintain optimal tyre pressure
Under-inflated tyres increase rolling resistance, making your engine work harder and consume more fuel. On the other hand, over-inflated tyres can lead to uneven wear and decreased traction, both of which negatively affect fuel economy. Regularly check your tyre pressure, especially before long trips or when carrying heavy loads, and adjust it according to the manufacturer's recommendations.
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Maintain optimal tyre pressure and remove unnecessary weight
Maintaining optimal tyre pressure and removing unnecessary weight from your vehicle are two effective ways to increase fuel economy in an aspirated diesel engine.
Maintaining Optimal Tyre Pressure
Maintaining the correct tyre pressure is crucial for improving fuel efficiency, extending tyre life, and enhancing vehicle safety. Underinflated tyres have higher rolling resistance, causing the vehicle to expend more fuel to move. Additionally, they wear out more rapidly and unevenly, necessitating more frequent replacements. To avoid these issues, it is recommended to check your tyre pressure regularly, ideally every two weeks, and before embarking on long journeys. You can find the recommended tyre pressure for your vehicle in the operator's manual or on a sticker inside the driver's door. This pressure is typically measured in pounds per square inch (PSI) or BAR pressure. It is important to note that tyre pressure can be influenced by temperature changes, with air pressure increasing in hot conditions and decreasing in cold weather. Therefore, it is advisable to check the pressure when the tyres are cold, before driving or when they are not exposed to sun or heat.
Removing Unnecessary Weight
Reducing the weight of your vehicle is another effective strategy to enhance fuel economy. Here are some methods to achieve this:
- Remove any unnecessary items from the car, such as excessive fuel, heavy car accessories, or items you don't need for the trip.
- Consider swapping steel or aluminium body panels with lighter alternatives made from glass fibre-reinforced plastic (GRP). This can significantly reduce weight without compromising strength.
- Replace glass windows with polycarbonate, which is lighter and can provide weight savings.
- Remove the air conditioning compressor, heater matrix, fan, and associated piping. These items can contribute a significant amount of weight.
- Opt for lighter alternatives or smaller versions of essential items, such as car batteries.
- Remove or replace heavy car accessories, such as the stereo, speakers, and wiring, with lighter options.
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Use high-quality diesel fuel with lubricants and detergents
Using high-quality diesel fuel is essential for maintaining the longevity of your engine and its components. Fuel lubricity and detergents are key considerations when selecting diesel fuel.
Lubricity refers to the fuel's ability to reduce friction and prevent wear and tear on critical engine components, such as fuel injectors and pumps. As diesel technology advances, maintaining adequate lubricity becomes increasingly crucial. Modern diesel engines are engineered with tighter tolerances, making them more sensitive to fuel quality. The transition to ultra-low-sulphur diesel (ULSD) has reduced the natural lubricating properties of diesel fuel, leading to heightened wear on key components. Therefore, it is essential to select diesel fuel with adequate lubricity improvers or additives to protect your engine.
Detergents are agents that help keep your fuel system clean by preventing and removing injector deposits. Over time, low-quality fuel without detergents can lead to the build-up of soot and carbon in your fuel system, increasing the workload on your engine and reducing fuel efficiency.
To enhance lubricity and add detergents to your diesel fuel, you can use aftermarket additives or treatment kits. Archoil's Diesel Fuel System Kit, for example, boosts the cetane rating, improves lubricity, and adds detergents to your fuel system. However, it is important to exercise caution when considering aftermarket additives, as some may not be necessary or provide significant benefits. It is recommended to consult with your fuel providers about the additive content in your fuel supply and best practices for adopting new additives.
Additionally, high-quality diesel fuel with lubricants and detergents can be achieved by selecting reputable fuel providers who prioritize quality assurance and precise additive injection. For example, ExxonMobil tests its fuel at various stages, from the refinery to the terminal, to ensure it meets or exceeds specifications.
By using high-quality diesel fuel with lubricants and detergents, you can improve the performance and longevity of your aspirated diesel engine, leading to better fuel economy and reduced maintenance costs.
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Regularly service your vehicle and replace worn-out parts
Servicing your vehicle and replacing worn-out parts is crucial for improving fuel economy and extending the lifespan of your diesel engine. Here are some detailed instructions to help you optimise your vehicle's performance and fuel efficiency:
Regular Servicing
Adhere to a consistent servicing schedule for your vehicle, including oil and filter changes. Clean oil reduces internal friction, allowing the engine to operate more smoothly and efficiently, which, in turn, improves fuel economy. High-quality oil is essential, as it provides optimal lubrication, reducing friction and wear on engine components. Additionally, ensure you are using the correct type of oil for your vehicle, as recommended by the manufacturer.
Replace Fuel Injectors
The fuel injectors spray fuel into your vehicle's engine. Over time, built-up deposits can clog the fuel injectors, compromising performance and reducing fuel economy. Regularly check and replace fuel injectors to maintain optimal engine performance and fuel efficiency.
Maintain Air and Fuel Filters
Clean air and fuel filters are essential for preventing unnecessary fuel waste. When changing the motor oil, clean or replace the air and fuel filters to ensure they are free of contaminants. Performance air filters are also available, which allow more air to flow into the engine, improving combustion efficiency and leading to better fuel mileage.
Check Tyre Pressure
Maintaining proper tyre pressure is crucial for improving fuel economy. Under-inflated tyres increase rolling resistance, making the engine work harder and consume more fuel. On the other hand, over-inflated tyres can lead to uneven wear and decreased traction, negatively impacting fuel economy. Check your tyre pressure regularly, especially after long trips, and adjust it according to the vehicle manufacturer's recommendations.
Reduce Vehicle Weight
Unnecessary weight in your vehicle can reduce fuel economy. Remove any non-essential items to reduce overall weight. Keeping your vehicle's load weight within the manufacturer's recommended limit ensures optimal fuel efficiency and enhances vehicle performance.
By following these servicing and maintenance tips, you can significantly improve the fuel economy of your aspirated diesel engine, resulting in both financial savings and a more efficient vehicle.
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Frequently asked questions
Under-inflated tyres increase rolling resistance, making the engine work harder and consume more fuel. Over-inflated tyres can cause uneven wear and decreased traction, negatively impacting fuel economy. Maintaining the optimal tyre pressure can significantly improve fuel efficiency.
Aggressive driving behaviours such as rapid acceleration, sudden stops, and speeding can decrease fuel economy. Smooth, steady acceleration and maintaining a consistent speed using cruise control can improve fuel efficiency.
Regular maintenance and timely replacement of worn-out parts, such as fuel injectors, air filters, and spark plugs, contribute to better fuel economy. Using high-quality diesel fuel and lubricants can also enhance engine performance and improve fuel efficiency.
