Crankcase ventilation systems take dirty gases and pass them back into the intake system to have them burned during combustion. While this is a positive for emissions, it is a negative when it comes to performance and engine longevity on the 6.7 Powerstroke.
For these reasons, deleting the CCV system is a popular modification to increase engine lifespan and maximize performance. However, there are also some negative implications to consider, especially with emissions compliance.
In this guide we are going to cover the pro’s and con’s of deleting the 6.7 Powerstroke CCV system.
Understanding CCV Deletes
For completely stock Powerstrokes, the CCV provides virtually no negative impact on the engine’s performance. However, on heavily modified trucks it can be different. The CCV system can become overwhelmed and start to push more oil and blow-by back into the turbocharger and engine. This can lead to failed turbos, loss of compression, and detonation. The more boost and power the engine makes usually the more blow-by will become a problem.
A CCV delete involves getting rid of the box and filter and replacing it with a single hose that vents to the atmosphere. With a 6.7 Powerstroke CCV delete you are still venting blow-by from the crankcase, but you are venting it into the atmosphere instead of the intake tract of the turbocharger.
Most kits completely remove the CCV box instead of just bypassing it. Sometimes, these are known as reroute kits, but they are the same thing as a delete. As we mentioned, there is no way to have a functioning engine without a CCV vent. So call it a reroute or delete, it’s the same exact thing.
6.7 Powerstroke CCV Delete Pro’s
- Stops blow-by and oil from reentering intake system
- Reduces buildup from blow-by and oil in turbocharger and engine
- Eliminates CCV box on top of engine (frees up space)
- Reduces intake temperatures
- Prevents CCV clogging
- No tuning required
As you can see, there are several benefits to deleting the CCV in the Powerstroke engine. Most importantly, deleting the CCV system stops blow-by from entering the turbocharger. This reduces oil buildup inside the turbocharger and engine. If enough oil gets into the combustion chamber, it can start to reduce compression and hurt performance.
On stock vehicles, it’s generally not a problem, but on heavily modified vehicles it becomes more of an issue. The more you modify your truck and produce more horsepower and torque, the more blow-by inevitably makes its way into the crankcase and CCV system.
In addition, a CCV delete removes the CCV box from on top of the engine. This is a nice way to free up some space under the hood which can make some areas easier to access. A CCV delete will also reduce intake temperatures, as the hot exhaust gasses will not be entering the turbo and making everything hotter and hurting performance.
Finally, a CCV delete will prevent the CCV system from failing or clogging, and it does not require tuning. It does not happen very often, but CCV systems can fail just like anything else. Removing the CCV eliminates a potential fail point from the engine. A CCV delete also does not require tuning, since it is not changing anything with the intake or exhaust.
CCV Delete Con’s
- Removes required emissions equipment
- Potential check engine light
- Warranty concerns
- Turbo seal failure
By far, the biggest con to a 6.7 Powerstroke CCV delete is that it doesn’t comply with emissions regulations. Technically, a CCV delete is only an option for pure race trucks that do not see the street, but many street enthusiasts use them.
A CCV delete is no different than deleting the DPF or any other emissions-based system. You will likely fail any visual inspections at emissions testing locations. Additionally, a frequent complaint from those who have deleted the CCV is check engine lights which in some cases are extremely frustrating to track down and eliminate.
There have also been complaints about premature wearing of turbo seals if the CCV is deleted. Considering that protecting the turbo is one of the benefits of a CCV delete, this is important to keep in mind.
So, Should You Delete it?
All of this begs the question: Should I delete my 6.7 Powerstroke CCV system? For most people, the answer is probably no. If your engine is stock or mostly stock, there is virtually no benefit from a CCV delete. Chances are you will hurt your warranty and run into emissions inspections problems.
However, if you have a heavily modified 6.7 Powerstroke, like with a turbo swap, a CCV delete may prove beneficial. Keep in mind, if you drive your truck on the street a CCV delete is illegal, but for race trucks it can be helpful when running extreme amounts of boost.
How to Delete the 6.7 Powerstroke CCV System
A 6.7 Powerstroke CCV delete is relatively straightforward, but also can be very tedious. Basically, you unplug the OEM CCV system, remove the box and all components, plug the oil-drain return feed from the missing box, and install a new hose. The hose connects to the CCV vent from the crankcase on one side, and remains open on the other, allowing the blow-by to vent to the atmosphere. You can also reroute the hose into the exhaust system, but this is a much more involved process. CCV systems contain a baffle to stop oil from just flowing out of the system, and also to stop contaminates from getting in.
A CCV delete kit removes the factory CCV system and replaces it with a single hose that vents blow-by to the atmosphere. This is usually a modification reserved for already heavily modified trucks, like those with turbo swaps.
No. A CCV delete will not improve horsepower or torque. However, it can reduce intake temperatures and prevent carbon buildup, both of which can negatively impact power.
Chances are, if you have a stock or mostly stock Powerstroke, a CCV delete is not a good idea. This is usually a modification reserved for already heavily modified trucks, like those with turbo swaps.