What Does a CCV Reroute Do?

Modern diesel engines are marvels of power, durability, and engineering efficiency. However, as emissions regulations have evolved, so too have the systems designed to meet these increasingly strict environmental standards. One such system is the Crankcase Ventilation (CCV) system, which plays a crucial role in managing internal engine pressure and emissions. Over time, however, this system can contribute to unwanted engine complications that reduce performance, increase maintenance, and affect long-term reliability. As a result, many diesel owners consider installing a CCV reroute as a practical upgrade. This article explores what a CCV reroute does, why it is often installed, and how it benefits diesel engines.

Understanding the CCV System in Diesel Engines

The Crankcase Ventilation (CCV) system is designed to relieve internal pressure caused by combustion gases that leak past the piston rings and enter the crankcase. These gases, commonly referred to as blow-by gases, are composed of air, unburned fuel, water vapor, and oil mist. Left unchecked, these gases would build up inside the engine and could cause seals to fail or gaskets to leak.

To manage this, the CCV system reroutes these gases from the crankcase back into the intake system, where they are re-burned in the combustion chamber. While this reduces hydrocarbon emissions and aligns with federal regulations, it introduces oil vapors and contaminants directly into the engine’s intake tract, leading to several performance and maintenance concerns over time.

What Is a CCV Reroute?

A CCV reroute modifies the factory crankcase ventilation pathway. Instead of routing the blow-by gases back into the intake system, the CCV reroute redirects them to a separate venting location—often to the atmosphere or through a catch can system. This redirection prevents oil vapors from re-entering the intake manifold and mixing with fuel and air during combustion.

The result is a cleaner intake system, reduced carbon buildup, and better overall airflow to the engine. The reroute can be installed using a series of hoses, fittings, and often a sealed filter or catch can that collects the oil vapor instead of allowing it to recirculate.

Key Benefits of a CCV Reroute

Installing a CCV reroute offers a wide range of advantages, especially for diesel trucks used in demanding applications such as towing, hauling, or performance modifications. Below are the most significant benefits associated with rerouting the CCV system.

1. Cleaner Intake System

One of the most immediate and visible benefits of a CCV reroute is the dramatic reduction in oil contamination within the intake manifold and intercooler system. When oil vapor is introduced into the intake, it sticks to internal surfaces and combines with soot from the Exhaust Gas Recirculation (EGR) system. This creates a thick, sticky sludge that coats intake runners, turbocharger fins, and charge pipes.

By redirecting oil-laden vapors away from the intake, a CCV reroute helps maintain cleaner intake components, which promotes better airflow and more efficient combustion.

2. Reduced Turbocharger Contamination

Turbochargers rely on precise air dynamics and extremely tight tolerances. When oil vapors enter the intake and pass through the turbocharger, they can create residue on the turbine and compressor wheels. Over time, this buildup restricts the turbo’s efficiency, slows spool-up, and may lead to premature bearing wear or seal failure.

A CCV reroute helps reduce these issues by preventing oil vapor from ever reaching the turbo, protecting this critical component and extending its service life.

3. Improved Engine Performance and Efficiency

Cleaner air entering the combustion chamber leads to more consistent combustion, which enhances throttle response and power output. Additionally, with fewer contaminants introduced into the intake system, the engine management system can maintain optimal air-to-fuel ratios, promoting better fuel economy and overall drivability.

While the performance gains from a CCV reroute alone may not be drastic, they become especially important when paired with other modifications such as intake upgrades, exhaust modifications, or tuning.

4. Extended Engine Life

Oil mist and combustion byproducts recirculated into the intake not only lead to carbon buildup but can also cause damage to sensors and intake valves. Over time, the contaminated intake environment may lead to poor sensor readings, misfires, and even intake valve sticking.

A rerouted CCV system mitigates these risks by ensuring that only clean air enters the intake tract, which contributes to smoother engine operation and longer service intervals.

5. Easier Maintenance and Reduced Downtime

Cleaning out the intake system, turbocharger, or intercooler due to oil sludge buildup is time-consuming and expensive. Many diesel truck owners who do not address the root cause of this contamination find themselves performing this cleaning multiple times throughout the truck’s life.

A CCV reroute greatly reduces the rate of oil vapor accumulation in these components. In many cases, owners who reroute their CCV system will not need to clean their intake or intercooler as frequently, leading to lower maintenance costs and more uptime on the road.

Common Applications and Use Cases

CCV reroutes are especially popular among diesel owners who use their trucks for high-load applications. These include:

• Heavy towing of trailers or equipment
• Off-road driving in dusty environments
• Performance or racing applications
• Long-distance hauling where engine longevity is critical

In all of these cases, keeping the intake system clean and the turbocharger operating efficiently provides tangible benefits.

For those seeking reliable engine ventilation upgrades, DynoVox offers precision-engineered CCV reroute kits for 6.7L Cummins, 6.7L Powerstroke, and 6.6L Duramax diesel engines. Designed for durability and performance, our kits reduce blow-by buildup and protect vital components. All products are stocked at DynoVoxParts.com with fast shipping, responsive support, and compatibility you can trust.

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2011-2023 Ford 6.7L Powerstroke CCV/PCV Reroute

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Are There Any Downsides?

While a CCV reroute offers numerous advantages, there are a few considerations to keep in mind:

1. Emission Compliance

In some regions, modifying or venting the CCV system to the atmosphere may not comply with emissions regulations. It is essential to verify the legality of a CCV reroute in your jurisdiction before proceeding with installation.

2. Proper Installation

A poorly installed CCV reroute may result in oil leaks, pressure imbalance, or check engine lights. It is crucial to use high-quality fittings and hoses designed for the specific engine model, and to follow professional installation practices.

3. Vent Location and Catch Can Maintenance

If using a catch can, it must be emptied periodically. Additionally, the reroute should vent in a clean and safe location that will not lead to environmental contamination or foul smells entering the cabin.

Conclusion

A CCV reroute is a highly effective modification for diesel engines, especially for those seeking improved reliability, better airflow, and reduced long-term maintenance. By redirecting oil vapors and blow-by gases away from the intake system, this upgrade helps preserve engine cleanliness, protect vital components, and promote more efficient combustion.

For diesel truck owners who are serious about maintaining the performance and longevity of their engine, a CCV reroute represents a smart investment. When combined with regular maintenance and other complementary upgrades, this simple yet powerful modification can help your diesel engine run cleaner, longer, and stronger.  

FAQS

1. What are the benefits of a CCV reroute on a 6.7L Cummins?
   A CCV reroute reduces intake sludge, protects your turbo, and extends engine life by redirecting harmful oil vapors away from the intake system.

2. Does a CCV reroute improve fuel economy?
   Yes, by improving air quality entering the combustion chamber, a CCV reroute can contribute to cleaner burns and improved fuel efficiency.

3. How often should I clean my catch can after a CCV reroute?
   It is recommended to check and empty the catch can every 3,000 to 5,000 miles, depending on driving conditions and engine load.

4. Is a CCV delete legal for street use？
   In many regions, rerouting or deleting emissions-related systems may violate local regulations. Always verify your local laws before installation.

5. Does a CCV reroute affect turbocharger performance?
   Yes, it helps preserve turbocharger performance by preventing oil vapor buildup on the turbine and compressor fins.

6. Can I install a CCV reroute kit myself?
   Most CCV reroute kits are designed for DIY installation and include detailed instructions. Basic hand tools are typically all that is needed.

7. Will a CCV reroute trigger check engine lights?
   Properly installed reroute kits typically do not trigger codes, but it is important to use components designed specifically for your engine.

8. What materials are best for CCV reroute kits?
   High-quality kits use oil- and heat-resistant hoses, anodized aluminum fittings, and stainless steel clamps to ensure long-term reliability.

9. Is a catch can necessary with a CCV reroute?
   While not always required, a catch can adds an extra layer of protection by capturing oil mist and debris, further preventing intake contamination.

10. What trucks benefit most from a CCV reroute?
    Diesel trucks used for towing, long-haul driving, or heavy-duty work see the most noticeable improvements in intake cleanliness and performance.