Sylvie Willis
Nitro fuel is used in RC cars with nitro engines. These engines are fuelled by methanol, which is often mixed with nitromethane as a performance additive. The percentage of nitromethane in the fuel can vary between 10% and 40%. The more nitromethane in the fuel, the more power the engine will generate. However, this also causes the engine to run hotter, which can reduce its lifespan. The ideal percentage of nitromethane depends on the desired output of the engine. For racing, it is recommended to use a lower percentage of nitromethane, typically less than 12%, to optimise performance.
| Characteristics | Values |
|---|---|
| Nitro engine fuel | Methanol |
| Performance additive | Nitromethane |
| Engine oil | Lubricant |
| Ignition system | Glow plug |
| RPM | 50,000+ |
| Mixture ratio | Carburetor or venturi with spraybar and needle valve |
| Fuel concentration | 10-40% nitromethane |
| Lubricant concentration | Less than 12% for racing, 20% for engine life |
| Engine type | Two-stroke |
| Engine break-in | Use the same % of nitro intended for regular use |
| Fuel brand | Stick to one brand once you've found the right one |
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What You'll Learn
Nitro fuel contains nitromethane, methanol, oil and alcohol
Nitro fuel is used in vehicles with a nitro engine. The main component of nitro fuel is nitromethane, a type of fuel that is burned in nitro engines. Nitro fuel contains between 10% and 40% nitromethane, which is mixed with methanol. The fuel is also doped with oil and alcohol. The percentage of nitromethane in the fuel affects the engine's performance and lifespan. A higher percentage of nitromethane results in a hotter engine that generates more power. However, increasing the concentration of nitromethane can depreciate engine performance and reduce its lifespan.
For a _.12-.15_ engine, a nitro fuel with 15-20% nitromethane is recommended. For big blocks, a percentage above 20% is suggested. It is important to note that the ideal concentration also depends on the desired output and application. For racing RC cars, a lower concentration of nitromethane (less than 12%) is preferred to prioritize engine performance. On the other hand, a higher concentration of nitromethane (around 20%) is recommended if prolonging engine life is a priority.
The oil content in nitro fuel is crucial for engine health. Nitro engines are typically two-stroke engines, which do not have a crankcase lubricated by oil. Therefore, the fuel must be mixed with oil to ensure proper lubrication. The oil content in the fuel can vary between 12% and 30%, depending on the nitromethane and methanol percentages, engine type, and application.
When choosing a nitro fuel, it is advisable to refer to the RC manual for specific recommendations on component concentrations. Consistency in fuel brand and type is also important, as frequent switching can impact engine performance and lifespan. Additionally, it is crucial to use the same percentage of nitro during the engine break-in stage as intended for regular use.
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Mixture percentages depend on engine type and application
Nitro fuel is used in vehicles with a nitro engine, which is fuelled by methanol, with nitromethane added as a performance additive. The nitromethane content in nitro fuel can vary between 10% and 40%. The percentage of nitromethane in the fuel mixture will depend on the engine type and application.
For a 0.12-0.15 engine, a mixture containing 15-20% nitromethane is recommended. For big blocks, a mixture with over 20% nitromethane is suggested. For a 2.1-2.5cc engine, a 16% nitro mixture is preferred, while a 3.5cc engine will require 20% nitro or more. For racing RC cars, the nitromethane content should be less than 12%, while a mixture with 20% nitromethane will better preserve the engine life.
The higher the nitro content, the more power the engine will generate. However, increasing the concentration will also depreciate engine performance. A sudden increase in concentration of over 10% can be harmful to the engine. Additionally, the more nitro in the mixture, the less oil it will contain, which can cause the engine to overheat. Therefore, it is important to find the ideal concentration for your engine and stick to it.
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Higher nitro content results in more power and higher temperatures
Nitro fuel is used in vehicles with a nitro engine, which is fuelled by methanol and often doped with nitromethane as a performance additive. The nitromethane content in nitro fuel can range from 10% to 40%. The higher the nitro content, the more power is generated, and the higher the engine temperature.
For a ".12-.15 engine", a nitro content of 15-20% is recommended, while for big blocks, a content of over 20% is considered suitable. The engine's lubrication is provided by the oil in the fuel mixture, so a higher nitro content results in less oil and higher engine temperatures.
It is important to note that a sudden increase or decrease in nitro concentration can be harmful to the engine. For racing, higher nitro content may be used, but this can also increase the risk of engine damage. Therefore, it is recommended to stay consistent with the nitro percentage and not switch fuel brands or types frequently.
The ideal nitro content depends on the desired output and application. For those seeking maximum performance and power, a higher nitro content is suitable, but this also requires more maintenance and can reduce engine life.
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Lubricant concentration impacts engine life and performance
Nitro fuel is used in vehicles with a nitro engine, which is typically fuelled by methanol and often doped with nitromethane as a performance additive. Nitro engines are so-called because of the marketing hype in the model car market, and they are also referred to as ''glow engines'' because of the glow plug that is electrically preheated by an electric current to ignite the fuel.
Nitro fuel for RC cars contains a percentage of nitromethane mixed with methanol, typically between 10% and 40%. The fuel also contains a percentage of oil, which acts as a lubricant. The optimum concentration of lubricant depends on the purpose of the vehicle and the desired output from the engine. For racing RC cars, the lubricant concentration should be less than 12% for optimal performance, whereas a concentration of 20% will help to prolong the engine life.
It is important to note that increasing the lubricant concentration too much can depreciate the engine performance. A sudden increase in concentration of more than 10% can be harmful to the engine. Therefore, it is recommended to fine-tune the engine and make small changes to the fuel mixture, keeping the tolerance to less than 5%.
The lubrication systems of internal combustion engines are designed to protect the engine from wear and high friction by forming a tribofilm that avoids direct contact between the sliding surfaces. However, these systems do not consider the effect of high lubricant supply rates on lubricant life. High lubricant supply rates can lead to early depletion of lubricant precursors, shortening the life of each batch of oil. Therefore, there is an optimal lubricant supply rate that maximizes its service life.
The impact of lubricant concentration on engine life and performance is also influenced by the chemical composition of the lubricant. For example, the sulfur and ash content in the oil can affect the combustion process and engine emissions.
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Nitro engines are also called glow engines
Glow plugs are not to be confused with spark plugs. Spark plugs are used to ignite the fuel/air mix every time the piston comes up, as seen in a petrol engine. In contrast, glow plugs do not require a spark to ignite the fuel. Instead, it is the temperature of the plug, which remains red-hot from previous ignition and the catalysis with the new compressed mixture, that ignites the fuel.
Nitro engines use a carburettor to mix the fuel and air together. However, in some applications where throttling is not required, they may use a simple venturi with a spray bar and needle valve. The carburettor can be either sliding or rotary.
The fuel used in nitro engines usually contains between 12% and 30% oil content, depending on the nitromethane and methanol percentage, the engine type, and application. The nitromethane percentage in the fuel can range from 10% to 40%. The oil lubricates the engine, and the more lubricant concentration, the longer the engine life. However, increasing the concentration too much will depreciate the engine performance.
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Frequently asked questions
Nitro fuel for RC cars contains nitromethane, oil, and alcohol. The percentage of nitromethane can vary between 10% and 40%. The oil content can be between 12% and 30%.
The higher the nitro content, the more power the engine will generate. For a ".12-.15" engine, 15-20% nitro is recommended. For big blocks, anything above 20% is good.
For racing RC cars, the nitro concentration should ideally be less than 12% to prioritize performance. If you're more concerned about engine life, a concentration of 20% is recommended.
It's best to stick to one brand of nitro fuel. Switching between brands and types can be harmful to the engine.
Nitro cars are typically smaller and run on nitromethane fuel, while petrol cars use ordinary petrol and are found in 1:5 scale or larger. Nitro cars are more popular due to their high performance.
