Rajan Wilcox
The fuel line length in a nitro vehicle is a hotly debated topic, with no clear consensus on the optimal length. Some enthusiasts argue that a longer fuel line provides more consistent pressure and helps the vehicle run more consistently, while others claim that it makes no difference as long as the line reaches from point A to point B. A longer fuel line can also increase fuel tank capacity and prevent the engine from stalling if the vehicle flips over, as it allows more time for the fuel in the line to run out. However, a shorter fuel line may be preferable to avoid air bubbles and fuel restrictions. Ultimately, the ideal fuel line length may depend on personal preference and the specific characteristics of the vehicle.
| Characteristics | Values |
|---|---|
| Ideal length of pressure line | 8 inches |
| Minimum length of pressure line | 6 inches |
| Maximum fuel line length | 125cc |
| Fuel line length for a buggy with a fuel filter and .21 engine | 75mm |
| Optimum length for the MP6 buggy with the O.S. Max RZ .21 with fuel filter | 9.5 inches of tubing on the fuel feed and 9 inches on the exhaust feed |
| Fuel line length for RC10GT | 1.5 inches |
| Fuel line length for MBX5 | Not mentioned |
| Fuel line length for EB4 S3 | Not mentioned |
| Fuel line length for Thunder Tiger ST-1 | 3 inches |
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What You'll Learn
A longer fuel line can prevent the engine from dying if the vehicle flips over
The fuel line length in a nitro vehicle is a hotly debated topic. While some people believe that the length of the fuel line does not matter as long as it connects the tank to the carburettor, others argue for a specific length to account for pulsing and avoid fuel foaming and leaning out.
A longer fuel line can indeed prevent the engine from dying if the vehicle flips over. This is because, when the vehicle is inverted, the longer line holds more fuel, allowing the engine to keep running until the vehicle can be flipped back over. This extra length provides more upside-down run time, giving the driver more time to get to the vehicle and flip it back over before the engine dies.
Additionally, a longer fuel line can help with tuning by providing a more steady pressure and a more even flow of fuel to the carburettor. This is achieved through coiling the tubing, which also helps to keep fuel from getting to the pipe and prevents flame-outs in the event of a flip. However, it is important to note that too long of a fuel line can cause issues with pressure and fuel delivery, and may cause the engine to run lean or not at all if the exhaust cannot push the fuel through.
While there is no consensus on the optimal length for a fuel line, some sources suggest that 6-8 inches for both the pressure and fuel lines is ideal, while others recommend a minimum of 6 inches to prevent pulsing with every exhaust stroke. It is generally agreed that the fuel line should be long enough to connect the tank to the carburettor, with some extra length for manoeuvrability in the event of a flip.
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A longer fuel line provides more consistent pressure
The length of a fuel line in a nitro model can impact its performance. While there are various opinions on the optimal length, a longer fuel line generally provides more consistent pressure.
A longer fuel line helps to smooth out the pulses from the tank, providing a more even flow of fuel to the carburettor. This is because a longer line acts as a coil, allowing for more fuel to be stored in the line. This is particularly beneficial if the vehicle flips over, as it will continue to run until the fuel in the line runs out, giving the operator more time to get to the vehicle and flip it back over.
The length of the fuel line can also impact the pressure in the fuel tank. A shorter fuel line can cause the fuel to surge as the revs increase and the fuel tank is pressurised. This is because a shorter line has less resistance, so the fuel flows more easily. However, as the revs drop, the pressure in the tank and lines also drops. On the other hand, a longer fuel line requires more pressure to push the fuel through initially, but once the line is full, it acts as a siphon, creating more consistent pressure. As the revs and pressure increase, it takes a more significant increase to make the fuel flow faster, resulting in a steadier pressure and a more consistent flow of fuel.
It is worth noting that while a longer fuel line can provide benefits, it is not always necessary. Some operators prefer to use shorter fuel lines, and this can work well depending on the specific vehicle and engine setup. Additionally, too long of a fuel line can cause issues, such as not having enough pressure from the exhaust to push the fuel, causing the engine to run lean or not at all. Therefore, it is important to find the right balance and ensure that the fuel line is not too long or too short.
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A longer fuel line can smooth out pulses from the tank
The length of the fuel line in a nitro engine is a hotly debated topic. While some people believe that the length of the fuel line is not significant, others argue that a longer fuel line can smooth out pulses from the tank, improving the engine's performance.
In an engine, the fuel injectors play a critical role in regulating fuel delivery to the cylinder. These injectors are electronically-controlled valves that open and close in a pulsing motion to deliver the desired amount of fuel. The length of the fuel line can influence the effectiveness of these injectors. A longer fuel line can act as a pulsation damper, reducing the impact of the injector's pulsing motion and resulting in a smoother fuel flow. This, in turn, can lead to improved engine performance, as it ensures a more constant and steady pressure, providing the carburetor with an even flow of fuel.
Additionally, a longer fuel line can provide benefits in certain situations. For example, if a vehicle with a longer fuel line flips over, the extra fuel in the line can keep the engine running for a longer duration, allowing for a potential self-righting or for the driver to get back to the vehicle and flip it over. This is a specific advantage often sought by bashers, who prefer longer fuel lines to give more upside-down running time.
However, it is important to note that there is a trade-off. While a longer fuel line can smooth out pulses, it can also lead to a reduction in pressure. Too long of a fuel line may result in insufficient pressure from the exhaust to push the fuel, causing the engine to run lean or not at all as it starves for fuel. Therefore, it is crucial to find the optimal length for the fuel line, ensuring that it is not too long or too short.
In conclusion, while the impact of fuel line length may vary depending on the specific engine and setup, a longer fuel line can indeed smooth out pulses from the tank. This can lead to improved engine performance and provide certain situational advantages. However, it is important to balance the length to avoid issues with insufficient pressure, ensuring that the fuel line is long enough to smooth pulses without causing other problems.
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A longer pressure line can prevent fuel foaming and leaning out
The length of the fuel line in a nitro engine is a hotly debated topic. While some people believe that the length of the pressure line does not matter, others argue that a longer pressure line can help prevent fuel foaming and leaning out.
A longer pressure line can help to smooth out the pulses from the tank, providing a more constant and steady pressure to the carburettor. This, in turn, can help to prevent fuel foaming and leaning out, as the carburettor receives a more consistent and even flow of fuel. A longer line can also provide more fuel in the line, allowing the engine to continue running for a short period even if the truck flips over and fuel leaks out of the outlet hole. This gives the operator time to right the truck and resume normal operation.
However, it is important to note that a longer fuel line can also increase the risk of fuel restrictions and leaks. Additionally, if the fuel line is too long, there may not be enough pressure from the exhaust to push the fuel, causing the engine to run lean or not at all as it starves for fuel. Therefore, it is generally recommended to keep the fuel line at a length that comfortably fits the engine, with a slight preference for a longer pressure line and a shorter feed line.
To ensure optimal performance, it is crucial to consider other factors besides fuel line length. These factors include fuel pressure, temperature, and the use of fuel filters. By carefully adjusting these variables in conjunction with fuel line length, operators can fine-tune their engines for the best performance and minimise issues such as foaming and leaning out.
In conclusion, while a longer pressure line can help prevent fuel foaming and leaning out by smoothing out pulses and providing a more constant pressure, it is important to balance this benefit against the potential drawbacks of excessive fuel line length. Careful consideration of all factors and regular maintenance can help ensure the engine runs smoothly and efficiently.
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A shorter fuel line can prevent air bubbles
The fuel line length in a nitro engine is a hotly debated topic. While some enthusiasts prefer a longer fuel line, others advocate for a shorter one. One of the primary concerns regarding fuel line length is the presence of air bubbles, which can cause the engine to shut off unexpectedly.
A shorter fuel line can indeed prevent air bubbles in a nitro engine. Longer fuel lines tend to be more susceptible to air bubbles, which can be challenging to eliminate once they form. In addition, longer lines can result in insufficient pressure from the exhaust to propel the fuel, leading to engine starvation and potential failure. Therefore, keeping the fuel line relatively short can help mitigate these issues.
Some enthusiasts recommend having a fuel line that is just long enough to reach between the carburettor and the exhaust, typically around 3 to 4 inches. This shorter length helps to prevent air bubbles and ensures adequate pressure for fuel delivery. However, it is worth noting that an excessively short pressure line can also cause problems. It should be at least 6 inches long to maintain constant pressure and avoid pulsing with each exhaust stroke.
While a shorter fuel line can aid in air bubble prevention, it is not the only factor to consider. The presence of fuel filters, for example, can also influence the occurrence of air bubbles. Some enthusiasts opt for two inline filters, believing that this is where extra run time truly comes from, rather than longer fuel lines. Additionally, ensuring that the screws fixing the tank are not too tight is crucial, as excessive tightness can restrict the tank's movement and contribute to air bubbles in the fuel line.
In summary, a shorter fuel line is generally recommended to prevent air bubbles in a nitro engine. However, it is important to strike a balance, as a line that is too short can also lead to issues. The ideal length seems to be around 6 to 9 inches, depending on the specific engine configuration and personal preference.
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Frequently asked questions
Yes, the length of the fuel line can impact the performance and functionality of a nitro. A longer fuel line can provide more consistent fuel pressure and help with tuning, while a shorter line may result in surging as the revs increase.
The ideal length for a fuel line on a nitro depends on various factors, such as the engine size and personal preference. Some sources suggest that a longer fuel line is preferable, while others recommend just enough to fit the car. There is no one-size-fits-all answer, and experimentation may be necessary to find the optimal length for your specific setup.
A longer fuel line can help smooth out pulses from the engine, provide more consistent fuel pressure, and increase the run time when the vehicle is inverted. This extra length gives more fuel in the line, allowing the engine to continue running until you can right the vehicle.
While a longer fuel line can provide benefits, it is important to consider potential drawbacks. A line that is too long may result in insufficient pressure from the exhaust to push the fuel, causing the engine to run lean or not at all. Additionally, longer lines can increase the risk of fuel restrictions and leaks.
