Rajan Wilcox
Two-stroke engines are a type of internal combustion engine that completes a power cycle with two strokes of the piston, one up and one down, in one revolution of the crankshaft. Two-stroke engines are commonly found in motorcycles, marine engines, and some small diesel engines. While it is possible to use 2-stroke oil in diesel fuel, it is not recommended as it has been proven to be harmful to diesel fuel systems and can foul your catalyst. Additionally, two-stroke engines have a reputation for not burning cleanly, which restricts their use to small applications.
Will diesel engines run on 2-stroke fuel?
| Characteristics | Values |
|---|---|
| Can diesel engines run on 2-stroke fuel? | Yes, some users have reported running their diesel engines on 2-stroke fuel with no issues. |
| Benefits | None |
| Ratio | 250ml 2SO JASO FB/50 litres of diesel with every single tank. |
| Quantity of 2-stroke oil per year | 5 litres of 2-stroke oil/year if you do 25k miles/year |
| Impact on lubricity | None |
| Impact on injectors | No impact on injectors, as per tests by BOSCH specialist centre in the UK |
| Impact on the engine | May lead to carbon build-up in the engine |
| Impact on the catalyst | Will foul the catalyst due to the presence of zinc |
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What You'll Learn
Two-stroke engines burn dirty, restricting their use
Two-stroke engines are a type of internal combustion engine that completes a power cycle with two strokes of the piston, one up and one down, in one revolution of the crankshaft. In contrast, a four-stroke engine requires four strokes of the piston in two crankshaft revolutions to complete a power cycle. Two-stroke engines are often used in smaller vehicles, such as motorcycles, scooters, and motorized rickshaws, due to their high power-to-weight ratio and lower manufacturing costs.
However, one of the major drawbacks of two-stroke engines is that they burn dirty, producing large volumes of dangerous pollutants, including hydrocarbons, carbon monoxide, and smoke. A single two-stroke engine can generate pollution equivalent to 30 to 50 four-stroke engines, significantly contributing to air pollution and its associated health risks. This issue has led to restrictions on the use of two-stroke engines in some regions. For example, in San Fernando City, Philippines, the local government offered economic incentives to replace two-stroke engines with more environmentally friendly alternatives.
The dirty burning of two-stroke engines is primarily due to the design of the engine and the fuel mixture. In a two-stroke engine, the fuel and oil must be combined as they occupy the same space in the engine. This combined fuel and lubrication system results in the burning of oil, leading to higher emissions and pollution levels. Additionally, some of the incoming pressurized fuel-air mixture can escape through the exhaust pipe, further contributing to pollution.
To address the environmental concerns associated with two-stroke engines, companies like Envirofit have developed retrofit kits that significantly reduce hydrocarbon emissions while increasing fuel efficiency. These kits offer a cost-effective solution for two-stroke engine owners, particularly in developing nations, where the high cost of upgrading to four-stroke engines can be prohibitive.
While adding two-stroke oil to diesel fuel has been practiced by some vehicle owners, it is generally not recommended. It has been proven that two-stroke oil is harmful to diesel fuel systems, and the quantities of oil required to achieve a specific ratio can contain zinc, which can foul catalysts. Therefore, while it is possible to run diesel engines on two-stroke fuel, it is not advisable due to the potential damage to the engine and the environmental implications.
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Two-stroke engines have a higher power-to-weight ratio than four-stroke engines
However, it is important to note that two-stroke engines are generally less efficient than four-stroke engines. They require separate lubrication, which is achieved by mixing oil into the fuel. This can result in higher fuel consumption and increased maintenance requirements. Furthermore, two-stroke engines may face challenges with blow-by and gas flow at higher revolutions per minute (RPM), limiting their ability to rev as high as four-stroke engines.
In terms of diesel engines, it is not recommended to use two-stroke oil in diesel fuel systems. While some people have added small amounts of two-stroke oil to their diesel fuel, it has been shown to be harmful to the system. It can cause deposits and fouling in the intake manifold and EGR valve, and catalysts. Therefore, while two-stroke engines may have a higher power-to-weight ratio, they are not typically diesel engines and are not recommended to be used with diesel fuel.
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Two-stroke engines can have separate fuel and lubrication systems
Two-stroke engines are a type of internal combustion engine that completes a power cycle with two strokes of the piston, one up and one down, in a single crankshaft revolution. In contrast, a four-stroke engine requires four strokes of the piston in two crankshaft revolutions to complete a power cycle. Two-stroke engines are generally less expensive to build, lighter, and have a higher power-to-weight ratio than four-stroke engines. They are commonly used in chainsaws, weed eaters, outboard motors, motorcycles, and racing applications.
Now, coming to the lubrication system in two-stroke engines, it is important to understand the difference between total-loss lubrication and a separate lubrication system. In a total-loss lubrication system, which is commonly used in two-stroke engines, the oil and fuel are mixed either before being installed in the fuel tank (pre-mix) or by direct injection into the engine (oil-injected). This mixture provides both energy and lubrication to critical components such as the crankshaft, connecting rods, and cylinder walls. The advantage of this system is that it allows the engine to operate in any orientation since the lubrication does not depend on gravity. However, one of the main disadvantages is that it can lead to higher engine wear due to the lack of a dedicated lubricant source.
On the other hand, two-stroke engines can also have a separate fuel and lubrication system, although this is less common. In this system, the fuel does not pass through the crankcase, so a separate source of lubrication is required. This type of system is often found in marine two-stroke diesel engines, where the size, weight, and cost are not as constrained as in smaller applications. By having a separate lubrication system, the engine can be more efficient and experience reduced wear, but it also adds complexity when compared to the simplicity of a total-loss lubrication system.
While it is possible for two-stroke engines to have separate fuel and lubrication systems, it is important to note that the addition of 2-stroke oil to diesel fuel in small quantities may not provide any significant benefits and has even been proven to be harmful to diesel fuel systems, particularly if they have a catalyst. Therefore, while two-stroke engines can have separate fuel and lubrication systems, it is important to carefully consider the design and requirements of the engine before making any modifications.
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Two-stroke oil can be added to four-stroke engines
Two-stroke and four-stroke engines are fundamentally different. A two-stroke engine completes a power cycle with two strokes of the piston, one up and one down, in one revolution of the crankshaft. On the other hand, a four-stroke engine requires four strokes of the piston in two crankshaft revolutions to complete a power cycle. Due to this difference, two-stroke engines often have a higher power-to-weight ratio than four-stroke engines.
Now, coming to the point of whether two-stroke oil can be added to four-stroke engines, there are mixed opinions. Some people claim that adding a little two-stroke oil to the fuel in four-stroke engines can provide extra lubrication to the top end, valves, and seats. This practice is especially common in older engines that were designed to run on leaded fuel. It is believed that a couple of splashes of two-stroke mix in a four-stroke engine can help cool down the muffler and heads, as well as quieten the top end sound during startup.
However, others argue that using two-stroke oil in a four-stroke engine can lead to a build-up of oil on the piston and valves. Additionally, it is important to note that two-stroke oil contains zinc, which can foul the catalyst if the engine has one. Therefore, while small quantities of two-stroke oil might not cause significant harm, it is not recommended to regularly use it in four-stroke engines.
Furthermore, when considering diesel engines specifically, it has been claimed that two-stroke oil is harmful to diesel fuel systems. Thus, it is generally not advisable to use two-stroke oil in diesel engines, regardless of whether they are two-stroke or four-stroke.
In conclusion, while it may be tempting to add two-stroke oil to four-stroke engines for extra lubrication, it is important to exercise caution. The potential benefits should be weighed against the risks of build-up, fouling, and harm to the engine, especially in the case of diesel engines.
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Two-stroke fuel can be mixed with diesel oil
However, some people argue that adding two-stroke oil to diesel fuel is unnecessary and potentially harmful to the engine. They suggest that if additional lubrication is required, a product specifically designed for this purpose should be used instead.
Those who do mix two-stroke oil with their diesel fuel typically add around 250ml of two-stroke oil to 50 litres of diesel with every tank of fuel. This ratio is said to be effective in preventing the fuel filter from becoming clogged.
It is important to note that mixing two-stroke oil with diesel fuel may not be suitable for all engines, particularly those with emission components, as the extra oil can damage or shorten the life of the emission system.
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Frequently asked questions
Yes, diesel engines can run on 2-stroke fuel, but it is not recommended as it may be harmful to the fuel system.
Using 2-stroke fuel in a diesel engine can cause carbon build-up and increase backflow. It can also lower the octane rating of the fuel, which may affect performance.
It is recommended to use a maximum of 250ml of 2-stroke fuel per 50 litres of diesel. This equates to 5 litres of 2-stroke fuel per year if you drive 25,000 miles per year.
Some people believe that adding 2-stroke fuel to diesel can help keep the fuel system clean and improve the lubricity of the fuel. However, there is no scientific evidence to support these claims.
