Mercedes Mullins
It is possible to use fuel lines as turbo oil feed lines, but it is not recommended as a permanent solution. Some generic auto store fuel pressure lines may not be able to withstand the heat and pressure and could burst. It is suggested to upgrade to a Tranny cooler line, which is rated at 320 psi and can handle the heat. Another option is to use steel-braided lines, which are known to be compatible with oil and can withstand higher temperatures. Some people have also used rubber hoses with clamps for the oil return, but this may not be suitable for the oil feed due to the high pressure.
| Characteristics | Values |
|---|---|
| Use of fuel line for turbo oil feed | Possible as a temporary solution |
| Recommended alternative | Steel-braided line |
| Other alternatives | Tranny cooler line, rubber hose with clamps (for oil return only), steel-reinforced rubber hose, braided line |
| Issues | Leaking, bursting, inability to withstand heat, oil breakdown, cracking |
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What You'll Learn
Using rubber hoses with clamps for oil return
While it is not recommended as a long-term solution, you can use rubber hoses with clamps for the oil return line in a turbocharger setup. This is because there is no pressure in the oil return line, so there is little risk of leakage from the clamps. However, for the oil feed line, you must use stainless steel braided lines with fittings due to the high pressure.
When choosing a rubber hose for the oil return, it is important to consider the hose's proximity to other components, especially hot ones like the downpipe. In one instance, a rubber hose was used for the oil return, but it touched the downpipe and burned a hole in it. Therefore, it is crucial to ensure that the rubber hose is routed away from any hot components to prevent damage and potential oil leaks.
Another consideration is the type of clamps to use with the rubber hose. It is recommended to use fuel injection clamps, which are designed for high pressure and will not tear into the rubber hose over time. These clamps also have a neat appearance and are removable if needed. Norma clamps are also a good option, as they are similar to fuel injection clamps and will not damage the rubber hose.
It is worth noting that some people have used fuel injector lines for the oil feed line in the short term successfully. These lines are typically rated at 100 PSI and are impervious to chemicals. However, this is not a permanent solution due to the high pressure in the feed line, which requires the use of stainless steel braided lines with fittings.
In conclusion, while it is possible to use rubber hoses with clamps for the oil return line in a turbocharger setup, it is not a long-term solution. It is important to consider the hose's proximity to hot components and choose suitable clamps that will not damage the hose. For the oil feed line, stainless steel braided lines with fittings are necessary to handle the high pressure.
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The temperature of the oil melting the hose
The temperature at which oil will melt a hose depends on the type of hose and the oil involved. For instance, rubber hoses are commonly used with fuel lines and oil feed lines, and they can work in hot temperature environments. However, they are not fireproof and cannot be used to transport directly burning gas or oil. Rubber hoses are also susceptible to degradation by fuel, which can lead to leaks.
Nitrile Butadiene Rubber (NBR) is a type of gasket commonly used in high-temperature applications up to 120°C (250°F) and has good resistance to oils and greases. Vapor hoses, which are often used in gasoline dispensing, can handle temperatures up to 140°F.
Silicone hoses are also popular for their resistance to extreme temperatures, with a working temperature range of \-60°C to +250°C. High-temperature silicone rubber can even withstand temperatures up to +300°C.
When it comes to oil feed lines, the type of oil and the operating temperature of the application should be considered when selecting a hose. Some oils have higher flashpoints than others, which can affect the likelihood of ignition. Additionally, the presence of other chemicals or solvents can impact the suitability of a particular hose material.
It is worth noting that some fuel injection lines are rated for higher pressures and temperatures than typical fuel lines, making them more suitable for use with oil feed lines. However, it is always recommended to consult a professional or refer to the manufacturer's guidelines to ensure the safe and proper use of hoses in any application.
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The right size fitting for the fuel line
The right size fitting for a fuel line is essential to ensure proper fuel delivery and performance. The choice of fitting depends on several factors, including the type of fuel line, the specific needs of the vehicle's fuel system, and personal preference.
One key consideration when selecting the right size fitting is the inner diameter (ID) of the fuel line. The ID of the fuel line should match the inner diameter of the fitting to prevent leaks and ensure proper function. It is crucial to verify that the inner diameters of the fuel line and the fitting are compatible.
Another factor to consider is the outer diameter (OD) of the fuel line. While AN (Army-Navy) standards dictate specific port machining and the use of O-rings to ensure reliable sealing, it is important to note that actual IDs and ODs can vary slightly depending on the supplier. Therefore, it is essential to check for compatibility and ensure that the fitting can accommodate the fuel line's OD.
The pressure levels in the fuel system also play a role in determining the right size fitting. For high-pressure applications, AN fittings are often used due to their reliability and availability in various sizes. Additionally, the engine's RPMs can impact fuel pressure, and higher RPMs may require a larger line size to maintain adequate fuel flow.
Common sizes for fuel line fittings include 5/16-inch (8mm), commonly used for smaller engines and low-pressure fuel systems; 3/8-inch (10mm), suitable for most passenger vehicles; 1/2-inch (12mm), which may be needed for larger engines and high-performance vehicles; and 5/8-inch (16mm) or larger for heavy-duty and high-performance applications. It is worth noting that a bigger pump and higher pump voltage can also contribute to achieving more pump head.
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The maximum temperature of the hoses
Rubber Hoses:
While rubber hoses are commonly used in automotive applications, their maximum temperature rating should be considered before using them for turbo oil feed lines. Some rubber hoses have a maximum temperature rating of around 300 degrees Fahrenheit, which may not be sufficient for the high temperatures generated by the turbocharger. It is important to note that the oil temperature might not be the primary concern, but the proximity to the exhaust manifold can cause the rubber to be exposed to higher temperatures.
Standard Low-Pressure Fuel Hose:
According to the SAE J30r7 specification, the maximum temperature for a standard low-pressure fuel hose is 257 degrees Fahrenheit. This type of hose is designed for low-pressure fuel applications and may not be suitable for the high temperatures associated with turbo oil feed lines.
High-Pressure Fuel Injection Hose:
The SAE J30r9 specification covers high-pressure fuel injection hoses, which have a maximum temperature rating of 275 degrees Fahrenheit for constant use. This rating is slightly higher than that of standard low-pressure fuel hoses but still may not be adequate for the extreme temperatures encountered in turbocharger systems.
Stainless Steel Braided Hoses:
Stainless steel braided hoses, often referred to as SS braided hoses, are commonly used for turbo oil feed and return lines. These hoses are designed to handle high temperatures and are compatible with most automotive fluids, including oil and coolant. The maximum temperature rating can vary depending on the specific hose, but some SS braided hoses are rated for temperatures up to 300 degrees Fahrenheit or higher.
Teflon (PTFE) Hoses:
Teflon, also known as PTFE, is another option for turbo oil feed and return lines. Teflon hoses are known for their high-temperature resistance, with some capable of withstanding temperatures up to 450-500 degrees Fahrenheit. This makes them suitable for the extreme temperatures found in turbocharger systems. However, it is important to consider the compatibility of Teflon with the specific fluids in the system.
Silicone-based Oil Hoses:
Silicone-based oil hoses are designed for high-temperature applications and are rated for use with oil. They offer flexibility and can withstand higher temperatures compared to some other hose types.
It is important to consult the manufacturer's specifications and recommendations for the specific hoses being considered. The maximum temperature ratings provided may vary, and it is crucial to select a hose that can handle the temperatures encountered in the turbocharger system to ensure the safety and performance of the application.
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Using clamps on the end of the rubber hose for added security
Using clamps on the end of a rubber hose for added security is a common practice when it comes to turbo oil feed and return lines. While some people use steel braided lines or stainless steel lines, others opt for rubber hoses with clamps, especially for the oil return line since there is no pressure there.
It is important to note that the rubber hose should be specifically designed for hot engine oil and rated for heat, corrosiveness of oil and fuel, and strength. The NAPA hose, for example, is rated for temperatures up to 300°F and is oil and solvent-safe. It is also important to ensure that the correct fittings are used, as some generic auto store fuel pressure lines may burst.
Some people have shared their experiences with using rubber hoses with clamps for turbo oil feed and return lines. One person mentioned that their rubber hose touched the downpipe and developed a hole, so they do not recommend it for long-term use. Another person shared that they used a razor to make a fuel line fit the fitting on their turbo, but the line burst where the hose clamp was attached.
To address these issues, some people suggest upgrading to a Tranny cooler line, which is rated at 320 psi and can withstand the heat. Others recommend using steel braided lines or stainless steel lines to avoid melting and breakdown due to the intense heat of the turbo. It is also worth noting that the fittings available for oil drains are often "off-the-shelf" items that may not always fit perfectly, so it is important to check the inside diameter of the fittings to ensure they are the correct size.
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Frequently asked questions
Yes, you can use a fuel line for the turbo oil feed temporarily. Some people have used rubber fuel injector lines for the oil feed without any issues. However, it is not recommended as a long-term solution as the oil temperature might melt the hose.
It is recommended to use a high-pressure fuel line, such as the VW lines, which can handle the heat and pressure. You can also use a Tranny cooler line, rated at 320 psi and capable of withstanding high temperatures. Another option is to get a steel-braided line.
While some people have used rubber hoses with clamps for the oil return without major issues, it is not advisable as a long-term solution. The rubber hose might not be able to handle the high temperatures near the exhaust manifold, and the oil can break down the rubber over time, leading to leaks and potential bearing issues.
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