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  3. MOROSO MN/6TC4

MOROSO MN-6TC4 Air Cleaner Oil Separator Cams MN/6TC4 Air/oil

fits model: Rl, Twin. year: 2014–2016.

6tc4 Moroso Mn/6tc4 Air/oil Separator For Twin Cams With Stock Air Cleaner 2014-2016 Rl

( Brand: Moroso ), ( Manufacturer Part Number: MN/6TC4 ), ( Color: Black ), ( Compatible Year: 2016 2015 2014 ), ( Compatible Make: Harley Davidson ), ( Compatible Model: Flhtkse Cvo Limited ), ( Bundle Description: 1 Pc Genuine Moroso Air/oil Separ ), ( Type: Air/oil Separator For Twin Cams With Stock Air Cleaner ), ( Core Charge: Free No Core Charge ), ( Fitment Type: Direct Replacement )

Review MOROSO Mn/6tc4 Air/oil Separator Cams Stock Air Cleaner fits TWIN RL 2014–2016

The **Moroso MN/6TC4 Air/Oil Separator** is a precision-engineered component designed specifically for twin-cam air cleaner setups on Harley-Davidson Sportster models from 2014 to 2016, including the iconic RL series. This high-performance separator is crafted to optimize airflow while efficiently filtering oil vapors from the crankcase, ensuring a cleaner intake charge and reducing the risk of oil contamination in the engine. Built with Moroso s signature attention to detail, the MN/6TC4 features a robust, durable construction that integrates seamlessly with the stock air cleaner system, maintaining the stock air cleaner s functionality while enhancing its performance. The separator s compact yet effective design minimizes backpressure, allowing for unrestricted airflow to maximize horsepower and throttle response. Its reliable oil separation capabilities help prolong the life of the air filter and intake components by preventing oil buildup, which can lead to clogging and reduced efficiency. Whether you're chasing raw performance or simply maintaining a cleaner engine bay, this separator is an essential upgrade for riders who demand both reliability and performance from their Sportster s air intake system. The MN/6TC4 is a direct-fit replacement, ensuring a hassle-free installation that preserves the stock air cleaner s aesthetics while delivering measurable improvements in engine protection and breathing efficiency.

The Moroso MN/6TC4 Air/Oil Separator is designed to replace the stock air cleaner on 2014 2016 Harley-Davidson Twin Cam engines, improving airflow and reducing oil carryover. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of the Moroso MN/6TC4 Air/Oil Separator**

1. **Enhanced Airflow and Performance**

The Moroso separator is designed to provide a more direct and unrestricted airflow path compared to the stock air cleaner. This can improve throttle response, especially in low-RPM situations, and contribute to a slight power increase by reducing backpressure. Many riders report a noticeable difference in engine breathing, particularly when accelerating from a stop or under light load.

2. **Reduced Oil Carryover**

The stock air cleaner on Twin Cam engines is prone to oil carryover, where oil mist from the crankcase is drawn into the intake, fouling the throttle body and intake valves over time. The Moroso separator uses a more efficient oil separation system, reducing the amount of oil that makes it into the intake. This can extend the life of the throttle body and intake components, though it does not eliminate the need for periodic cleaning.

3. **Easier Maintenance**

The Moroso separator is designed for easier access and maintenance. The oil drain is more straightforward to access, and the separator can be cleaned or replaced more efficiently than the stock unit. The filter element is also easier to remove and replace, which can save time during routine maintenance.

4. **Compatibility and Fit**

Moroso is a well-respected brand in the motorcycle aftermarket, and this separator is specifically designed for the 2014 2016 Twin Cam models. It fits seamlessly with the stock intake system, requiring minimal modification. The installation process is relatively straightforward for those with basic mechanical skills, though some riders may prefer to have it installed by a professional.

5. **Durability and Quality**

Moroso products are generally known for their durability and reliability. The MN/6TC4 is constructed with materials that are designed to withstand the rigors of motorcycle use, including heat and vibration. The separator is also backed by Moroso s warranty, which can provide peace of mind for long-term use.

6. **Cost-Effective Upgrade**

Compared to more aggressive performance upgrades like full intake systems or turbocharging, the Moroso separator is a relatively inexpensive way to improve airflow and reduce oil carryover. It offers a balance between performance gains and practicality without requiring a significant investment.

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### **Cons of the Moroso MN/6TC4 Air/Oil Separator**

1. **Limited Performance Gains**

While the Moroso separator improves airflow compared to the stock unit, it is not a radical performance upgrade. The gains are modest and may not be noticeable to all riders, particularly those who are not heavily focused on power or acceleration. For serious performance enthusiasts, more aggressive upgrades (such as a full intake system or a high-flow throttle body) may be required to see significant improvements.

2. **Oil Carryover is Not Eliminated**

Although the Moroso separator reduces oil carryover, it does not completely eliminate it. Oil will still be present in the intake system to some degree, especially under hard acceleration or when the engine is cold. Riders will still need to periodically clean the throttle body and intake components to prevent buildup. This is not unique to the Moroso separator but is a characteristic of all air/oil separator systems on Twin Cam engines.

3. **Installation Complexity**

While the Moroso separator is designed for ease of installation, it still requires some mechanical skill to install correctly. The process involves removing the stock air cleaner, disconnecting the intake hose, and properly securing the new separator. Improper installation such as incorrect sealing or misalignment can lead to leaks or reduced performance. Some riders may find the process more involved than they anticipate, especially if they are not familiar with working on their bike s intake system.

4. **Potential for Increased Oil Consumption**

In some cases, reducing oil carryover can lead to a slight increase in oil consumption, as the engine may draw in more oil from the crankcase to compensate for the reduced mist. While this is not a major issue for most riders, it is something to monitor, especially if the bike is ridden aggressively or over long distances. Regular oil checks are recommended to ensure the engine remains properly lubricated.

5. **Compatibility with Other Mods**

If the bike has other modifications, such as a high-flow throttle body or a different intake system, the Moroso separator may not integrate as smoothly. For example, some riders report that the separator can restrict airflow if paired with a very high-flow throttle body, negating some of the benefits. It is important to ensure that all components in the intake system are compatible and properly matched.

6. **Noise**

The Moroso separator can make the engine slightly louder, particularly at idle or low RPM. While this is not typically an issue for most riders, those who prefer a quieter ride may find the change noticeable. The noise is generally not excessive but can be more pronounced than the stock air cleaner.

7. **Filter Replacement Costs**

The filter element in the Moroso separator will need to be replaced periodically, typically every 5,000 10,000 miles, depending on riding conditions. While the filters are reasonably priced, this adds to the long-term cost of ownership compared to a stock air cleaner, which may only require occasional cleaning.

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### **Conclusion**

The Moroso MN/6TC4 Air/Oil Separator is a practical and effective upgrade for 2014 2016 Twin Cam Harley-Davidsons. It offers tangible benefits in terms of improved airflow, reduced oil carryover, and easier maintenance, making it a worthwhile investment for riders who want to enhance their bike s performance without undertaking major modifications. The separator is well-built, easy to install, and compatible with the stock intake system, which adds to its appeal.

However, the performance gains are modest, and the separator does not eliminate oil carryover entirely. Riders will still need to perform regular maintenance on the throttle body and intake components. Additionally, the installation process requires some attention to detail, and compatibility with other mods should be considered. For most riders, the pros outweigh the cons, and the separator provides a good balance between performance, practicality, and cost.

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### **Recommendation**

If you are looking to improve the airflow and reduce oil carryover on your 2014 2016 Twin Cam Harley-Davidson, the Moroso MN/6TC4 Air/Oil Separator is a solid choice. It is particularly well-suited for riders who want a straightforward upgrade that enhances performance without requiring extensive modifications. Pair it with regular maintenance such as cleaning the throttle body and checking oil levels to maximize its benefits.

For riders who are more focused on aggressive performance gains, consider pairing the Moroso separator with other upgrades, such as a high-flow throttle body or a full intake system. However, for the average rider seeking a practical and effective improvement, the Moroso separator is an excellent and cost-effective solution. If you are comfortable with basic mechanical work, installing it yourself is a viable option; otherwise, having it professionally installed will ensure optimal performance and longevity.

Details:

Moroso Air/Oil Separator for Twin Cams with Stock Air Cleaner 2014 - 2016 Rl: Status: In.

part #: mn6tc4 price

  • $373.16

specifications intakefuelmotorcycle:

  • for models: Rl, Twin
  • for years: 2014-2016
  • brand: Moroso
  • mpn: Mn/6tc4
  • color: Black
  • compatible year: 2016 2015 2014
  • compatible make: Harley Davidson
  • compatible model: Flhtkse Cvo Limited
  • bundle description: 1 Pc Genuine Moroso Air/oil Separ
  • type: Air/oil Separator For Twin Cams With Stock Air Cleaner
  • core charge: Free No Core Charge
  • fitment type: Direct Replacement

offer intakefuelmotorcycle:

  • availability: In Stock
  • started: March 22, 2026
  • sold: 0
  • quantity: 1
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general intakefuelmotorcycle:

  • condition: New
  • Motorcycle Scooter Parts Accessories > Air Intake Fuel Delivery > Other Air Intake Fuel Delivery

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  • # reviews: 19359
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for models: rl, twin, for years: 2014-2016, compatible year: 2016 2015 2014, compatible make: harley davidson, compatible model: flhtkse cvo limited, bundle description: 1 pc genuine moroso air/oil separ, type: air/oil separator for twin cams with stock air cleaner, core charge: free no core charge, fitment type: direct replacement,
category: motorcycle parts > motorcycle scooter parts accessories > air intake fuel delivery, color: black, sku: 23069641246930813,
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