The Best Turbo Oil Return Installation In Ls Pan

When installing a turbo oil return, it is important to consider the angle of the return and to ensure that the drain is above the oil level to prevent backfeeding. The most common solution is to weld a bung to the oil pan, towards the top, so it is above the oil level. This can be done on either the oil pan or the timing cover, as long as it is lower than the turbo. Some oil pans, such as the Holley 302-3, come with turbo drains, simplifying the process.

Turbo oil return line: pan or timing cover?

When installing a turbo oil return line, there are a few options for placement, each with its own advantages and considerations. The two most common locations for the turbo oil return line are the oil pan and the timing cover.

Oil Pan

The oil pan is a popular choice for the turbo oil return line. It is important to ensure that the return line is above the oil level to prevent backfeeding into the turbo. Some oil pans, such as the Holley 302-3, come with turbo drains built-in. Alternatively, you can drill and tap the oil pan to create a custom return line location. When drilling and tapping the oil pan, it is recommended to use a bulkhead fitting with a crush washer to secure the line and prevent leaks. The oil pan provides a convenient location for the turbo oil return line and allows for a clean installation.

Timing Cover

The timing cover is another option for the turbo oil return line. This location is typically higher than the oil level, reducing the risk of backfeeding. When using the timing cover, it is important to ensure that the return line does not interfere with the balancer or other components. Some aftermarket timing covers are available with turbo drain ports already installed, but it is crucial to ensure that they clear the front accessory drive. Additionally, avoid cutting into the embossments on the timing cover, as they are necessary to clear the bolts on the oil pump. The timing cover provides a neat solution for the turbo oil return line, especially for high-mounted turbos.

In conclusion, both the oil pan and the timing cover are viable options for the turbo oil return line. The decision between the two depends on factors such as vehicle configuration, turbo location, and personal preference. It is essential to consider the specific requirements of your vehicle and turbo setup when making this decision. Always refer to the manufacturer's recommendations and consult with professionals or mechanics if you are unsure.

Turbo oil return above oil level

When installing a turbo oil return in an LS pan, it is important to consider the oil level in the pan. The turbo oil return should ideally be installed above the oil level to prevent oil from backing up into the turbocharger.

Some oil pans, such as the Holley 302-3, come with turbo drains, allowing for an easier installation process. However, if your oil pan does not have a built-in turbo drain, you can drill and tap the upper oil pan to create a hole for the turbo oil return. It is important to ensure that the hole is above the oil level to prevent any issues with oil backflow.

Another option is to use a bulkhead fitting for the turbo oil return. A bulkhead fitting is a type of connector that allows the turbo oil return line to pass through the oil pan. When using a bulkhead fitting, it is important to ensure that the fitting is above the oil level to prevent oil backflow. Some people prefer to use a bulkhead fitting as it can be easier to install and does not require drilling and tapping the oil pan.

The location of the turbo oil return can also affect the performance of the turbocharger. It is recommended to place the turbo oil return towards the top of the pan and inline with a main cap. This helps to lower the chance of oil splashing onto the crankshaft, which can cause a parasitic drain of horsepower.

Overall, when installing a turbo oil return in an LS pan, it is important to ensure that the return is above the oil level to prevent oil backflow and potential damage to the turbocharger. By following the recommendations and considerations outlined above, you can ensure a proper and effective installation of the turbo oil return.

Drilling LS pan for oil return line

Drilling an LS pan for an oil return line is a common modification for turbocharged vehicles. The oil return line is an essential component of a turbocharger system, allowing the oil used to lubricate the turbocharger to drain back into the engine oil pan.

When drilling the LS pan for the oil return line, it is crucial to select the appropriate location for the hole. The ideal spot is typically towards the top of the pan, above the oil level, and in line with a main cap. This positioning helps to prevent oil from splashing onto the crankshaft, which could result in a parasitic drain of horsepower. It is also important to ensure that the oil return line is not placed at the oil level sensor, as this can cause issues with oil backfeeding into the turbocharger.

Some aftermarket oil pans, such as the Holley 302-3, come with turbo drains already installed. Alternatively, you can drill and tap your own hole in the oil pan and use an adapter fitting to connect the oil return line. When drilling and tapping the hole, it is important to use the correct size and type of drill bit and tap to ensure a secure fit for the adapter.

Sealing the oil return line is another critical aspect of this modification. While some people suggest using silicone sealer or RTV, others recommend using Teflon thread paste or a thread sealant with PTFE. Additionally, products like JB Weld can be used for extra security to prevent leaks.

It is worth noting that the oil cooler ports in LS engines should not be used for the oil return line as they are pressurised and can backfeed into the turbocharger.

Turbo drain solutions

Oil Pan or Timing Cover:

Firstly, you can choose to install the turbo oil return in either the oil pan or the timing cover, as long as it is lower than the turbo itself. This is a key consideration to ensure the effective drainage of oil.

Above the Oil Level:

It is recommended that the turbo drain is located above the oil level to prevent oil backfeeding into the turbo. This is an important factor to avoid potential issues and damage to your engine.

Welding a Bung:

One common solution is to weld a bung to the oil pan, positioning it towards the top of the pan and above the oil level. This method ensures the drain is above the oil level and can help to reduce the chance of oil splashing onto the crank, which could result in a parasitic drain of horsepower.

Drilling and Tapping:

Another option is to drill and tap the oil pan or block to create a threaded hole for the turbo oil return. This method requires careful execution to ensure accurate threading and adequate thread engagement.

Bulkhead Fitting:

Some prefer to use a bulkhead fitting, which involves drilling a hole in the oil pan and securing the fitting with a crush washer and nut on the inside of the pan. This method provides a clean and secure installation.

Oil Sensor Location:

It is advised not to use the oil level sensor location for the turbo drain as this is typically below the oil level, which can lead to backfeeding issues.

Pre-Drilled Pans:

Some oil pans come with turbo drains pre-drilled, such as the Holley 302-3. These pans offer a convenient solution, but ensure the drain location aligns with your specific turbo setup.

Oil Cooler Ports:

While oil cooler ports are commonly used to feed turbos, they should never be used for the drain as they are pressurized and can backfeed oil into the turbo.

Timing Cover Ports:

Timing covers with turbo drain ports are also available, but ensure they clear your front accessory drive when installed.

LS Swap Oil Pans:

When performing an LS swap, consider using an LS swap oil pan designed for turbo applications. These pans often feature a built-in turbo oil drain, simplifying your installation.

Complementary Components:

Remember that the right complementary components can enhance the performance and practicality of your setup. For example, specialized bolts or an oil pump pickup tube specific to your pan may be required.

In conclusion, when installing a turbo oil return in an LS pan, carefully consider the location, ensuring it is above the oil level to prevent backfeeding. Utilize welding, drilling and tapping, or bulkhead fittings to securely install the turbo drain. Pre-drilled oil pans and LS swap oil pans with built-in turbo drains can also simplify the process.

Turbo oil return line fittings

When selecting a fitting for the turbo oil return line, it is crucial to ensure that it is compatible with the specific vehicle's engine and turbocharger setup. Incompatible or poorly fitted components can lead to oil leaks, decreased performance, and even engine damage.

One popular option for turbo oil return line fittings is the use of a bulkhead fitting. This type of fitting involves drilling a hole in the oil pan and securing the fitting with a nut and a crush washer on the inside. While this method provides a clean and straightforward installation, some enthusiasts prefer to drill and tap the oil pan directly to install the fitting, as it offers a more secure connection.

Another critical consideration when choosing a turbo oil return line fitting is the location of the oil drain. It is recommended to position the drain above the oil level to prevent backfeeding into the turbocharger. Additionally, placing the drain inline with a main cap can help reduce the chance of oil splashing onto the crankshaft, minimising parasitic power loss.

When installing turbo oil return line fittings, it is essential to use high-quality components that meet the vehicle's specific requirements. This includes selecting the appropriate oil feed and return lines, as well as any necessary adapters or flanges. Ensuring that all fittings are securely tightened and sealed will help prevent leaks and maintain optimal oil circulation.

Frequently asked questions