Mercedes Mullins
Radio-controlled (RC) cars are typically fuelled by nitromethane, a performance additive to methanol. The percentage of nitromethane in the fuel can vary, with some RC car users opting for 15% or 16% and others using 25% to 30% nitro. The higher the percentage of nitromethane, the more power the engine will generate. However, this comes at the cost of engine life. Nitro engines for RC cars can turn in excess of 50,000 RPM, with common operating RPMs ranging from 25,000 to 37,000. Aside from nitromethane, some RC cars also run on ordinary petrol, but these are typically much bigger, with a scale of 1:5 or larger.
| Characteristics | Values |
|---|---|
| Engine type | Two-stroke engines |
| Fuel | Nitromethane, methanol |
| Power source | Glow plug |
| RPM | 25,000–37,000 |
| Oil content | 12–30% |
| Fuel type | 10%, 15%, 16%, 20%, 25%, 30% |
| Brand | VP |
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What You'll Learn
Nitro vs petrol RC cars
Nitro and petrol RC cars have been compared and contrasted by enthusiasts for decades. While some enthusiasts prefer one over the other, the choice between the two types of RC cars depends on the buyer's preferences and requirements.
Nitro RC cars run on a fuel called Nitromethane, which combines nitromethane, methanol, and oil. They are known for their high level of performance and are the most popular. Nitro engines are usually smaller and lighter, with sizes ranging from 1/16th to 1/8th scale. They are more maintenance-intensive and require accessories like a glow lighter, a starter box, a block warmer, and a temp gun. Nitro fuel is also more expensive, costing around $40-$60 per gallon, and the cars themselves can be costly to buy, use, and maintain. Nitro engines are more challenging to tune, more temperature-sensitive, and require regular cleaning due to engine oil. However, they offer long run times, high power outputs, and a realistic vehicle sound and smell due to the small Nitromethane-based engine.
On the other hand, petrol RC cars use ordinary unleaded petrol combined with 2-Stroke oil. They are bigger, typically 1/5th or 1/4 scale, and are therefore faster than nitro cars. Petrol engines are easier to start and tune, making them more reliable. They hold their tune well and are generally more robust. Petrol cars are also more cost-effective as their fuel can be sourced from any service station at regular prices. However, they are generally more expensive to purchase as larger model sizes are required to accommodate the engine. Petrol engines use spark plugs for ignition, while nitro engines use glow plugs.
In summary, nitro RC cars offer high performance, long run times, and a realistic driving experience but come with higher maintenance and fuel costs. Petrol RC cars are easier to maintain, more cost-effective in terms of fuel, and have a simpler ignition system, but they are larger in size and may be more expensive to purchase. The choice between the two ultimately depends on the buyer's priorities and budget.
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Engine requirements
Nitro engines are fuelled by methanol, with nitromethane added as a performance additive. The ignition system consists of a glow plug, which is heated with an electric current to start the engine. The combination of residual heat and catalytic action of the platinum alloy with methanol ignites the fuel mixture. Nitro engines can turn in excess of 50,000 RPM. The RPM range for RC cars is typically 25,000–37,000. With this much movement, a lot of frictional heat is generated, and the fuel used for these engines usually contains between 12 and 30% oil content, depending on the nitromethane and methanol percentage, and the engine type. The oil content is important as it helps to lubricate the engine and prevent premature wear. The percentage of nitro in the fuel will also impact the engine life, with higher percentages of nitro potentially requiring additional adjustments to the engine to compensate.
Petrol engines, on the other hand, run on ordinary petrol and are typically found in larger RC cars with a scale of 1:5 or larger.
It is important to note that the specific engine requirements, such as fuel type and percentage, may vary depending on the make and model of your RC car. Always refer to the manufacturer's instructions or consult with an experienced hobbyist to ensure you are using the correct fuel and engine settings for your particular RC car.
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Octane levels
The octane rating of fuel indicates how much the fuel can be compressed before it ignites spontaneously. Most RC engines are designed to run on 90-93 octane fuel for optimal performance. Some engines may require up to 17:1 compression domes to benefit from high octane fuel.
Using a higher octane fuel than required by the engine will not improve its condition and will only result in unnecessary expenses. It is important to note that some race fuels sold in the US contain lead, which can destroy catalytic converters in modern cars. Therefore, it is recommended to use unleaded high-octane fuel.
The optimum fuel mix concentration for RC cars depends on the desired output. If racing performance is a priority, a lower lubricant concentration of less than 12% is ideal. On the other hand, if engine longevity is a concern, a higher lubricant concentration of 20% is more suitable. It is crucial to fine-tune the engine according to the desired output and stick to the chosen fuel brand and concentration to maintain engine life and performance.
Some users have reported significant gains in top speed by using high octane fuel in their RC vehicles. For example, one user achieved a top speed of 27 mph with VP 118 octane fuel, compared to 23 mph with pump 87 octane fuel. However, it is important to note that the gains in performance may vary depending on various factors, and there are also reports of no significant benefits from using higher octane fuel.
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Oil content
The fuel used for nitro engines usually contains between 12 and 30% oil content, depending on the nitromethane and methanol percentage, and the engine type. The higher the percentage of oil, the more lubrication the engine receives. This is important because without enough lubrication, the engine will overheat and wear out prematurely.
Nitro engines are fuelled by methanol, which is often doped with nitromethane as a performance additive. The ignition system consists of a glow plug, which is heated with an electric current to start the engine. Once the engine is started, the power is cut off, and the combination of residual heat and catalytic action of the platinum alloy with methanol ignites the fuel mixture.
The percentage of nitromethane in the fuel mixture can be adjusted to meet the specific needs of the driver. For example, VP offers a range of premium RC nitro fuels designed for everyone from beginners to pros. Their Master Basher fuel is perfect for RTR vehicles, as it combines advanced lubricants and additives to reduce engine wear and extend engine life. For serious 1/8-scale off-road racers, VP’s RC Pro Race fuel and 30% TT blends are crafted to meet the demands of competitive racing. The RC Pro Race blend features a synthetic/castor oil mix, while the TT blend boasts a proprietary synthetic package for optimal performance on the track.
The percentage of oil in the fuel mixture is also important. While some people believe that oil content is less of a worry, and that oil percent doesn't matter as much, others disagree. One user on an RC forum stated that oil content does matter a lot, and that the best oil content is around 10%. This user also noted that higher nitro content will not hurt the life of an engine, but that more head shims may be needed to compensate. Another user agreed that 10% oil content is okay for breaking in an engine, as long as the fuel is formulated for cars, not boats or airplanes.
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Pre-made vs custom fuel blends
RC cars can be powered by either electricity or fuel. Fuel-powered RC cars, also known as nitro RC cars, typically run on a blend of fuel called nitromethane. The percentage of nitro in the fuel blend can vary, with some blends containing as little as 15% nitro while others contain up to 30% or more. The choice of fuel blend depends on the type of engine and the desired performance.
Pre-made fuel blends, such as those offered by VP Racing Fuels, are designed to meet the needs of a wide range of RC car enthusiasts, from beginners to those competing in national or world championships. These blends are crafted to maximize power, reduce wear, and extend engine life. For example, VP's Master Basher fuel is designed for RTR vehicles and contains advanced lubricants and additives to enhance engine performance and durability. On the other hand, their RC Pro Race fuel and 30% TT blends are tailored for competitive racing, with the former featuring a synthetic/castor oil mix and the latter boasting a proprietary synthetic package.
Custom fuel blends, on the other hand, allow RC car enthusiasts to create their own unique fuel mixtures tailored to their specific engines and performance goals. This level of customization can be advantageous for those with extensive knowledge of engine design and mechanics, as it allows for precise control over the fuel's composition. For instance, one user reports running 25-30% nitro with 9-11% oil, which they claim enhances engine performance without sacrificing durability.
The main advantage of pre-made fuel blends is convenience and reliability. These blends are carefully crafted by experts to ensure optimal performance and engine protection. Additionally, pre-made blends eliminate the risk of incorrect fuel mixing, which could potentially damage the engine. In contrast, custom fuel blends offer greater flexibility and the potential for enhanced performance by allowing users to fine-tune their fuel mixtures. However, this approach requires a deep understanding of engine mechanics and fuel chemistry to avoid potential issues.
Ultimately, the choice between pre-made and custom fuel blends depends on individual preferences, skill level, and engine requirements. Pre-made blends offer convenience and peace of mind, while custom blends provide the freedom to experiment and optimize fuel mixtures for specific applications.
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Frequently asked questions
RC cars use a variety of fuels, including electric, petrol, and nitro. Nitro cars are the most popular as they have very high performance.
Nitro engines are fuelled by methanol, which is often mixed with nitromethane as a performance additive. They are typically two-stroke engines, which means it takes two strokes of the piston for the engine cycle to complete.
The higher the percentage, the more nitro in the fuel, and the more powerful the engine will be. 10% nitro is usually used for airplanes and can damage car engines.
