Closed Crankcase Ventilation 101 – Diesel Emission Retrofits

in Blog

Do you feel like you want to wear a face mask whenever you start up your old diesel truck? Do you get a headache from the fumes while you’re inside the passenger cab of your vehicle?

Diesel-powered trucks create a lot of emissions, which is bad for the environment and your own breathing quality. There are also many local, state, and federal laws that regulate the emissions of your truck.

Closed crankcase ventilation (CCV) is a diesel emission retrofit that solves the problem of escaped emissions. If you have older vehicles and equipment in your fleet, you’ll want to look into CCVs.

We’ve learned a lot since the old days when we used to let emissions escape unfiltered into the atmosphere. For example, older diesel trucks simply don’t perform as well if they aren’t equipped with emission control devices.

But are you that CCVs will be an expensive diesel emission retrofit requirement to meet – especially if you have an entire fleet of vehicles needing closed crankcase ventilation?

In actuality, CCVs will save you money as the performance of your engine will be improved, requiring less maintenance and fewer costly repairs.

Less pollution. Better engine performance. It’s a win-win.

What is Closed Crankcase Ventilation?

Those oil drips in parking lots, garage floors, and driveways? They’re caused by blow-by, which is what happens when high-pressure gases and oils escape from your diesel vehicle and vent into the atmosphere.

They’re also an indication that there’s an accumulation of contaminants on your engine.

Bad for your driveway; bad for your engine; bad for your wallet.

Closed crankcase ventilation (CCV) filters the blow-by as the vacuum from the supercharger sucks up the gases and sends it into the intake manifold to reintroduce those gases to the chamber. This process helps keep bothyour engine and the environment cleaner.

Why CCV?

Crankcase emissions actually contribute up to a whopping 25% of total emissions, so it makes sense that we would need to control this pollution source. And it makes sense that controlling the pollution would help your vehicle’s engine run more efficiently.

The beauty of CCVs is that they get rid of crankcase emissions that would otherwise escape through the crankcase vent tube.

They also stop oil from escaping from the engine during driving or idling, which creates a better air environment for the passenger compartment.

And not only do they keep your engine cleaner, CCVs also help you to use less oil.

Waste Not, Want Not

During the ignition cycle of the engine, a small amount of gases leak by the compression rings on each cylinder. Those gases need to go somewhere, or you’ll get a buildup in the crank case. Older vehicles vented the gas into the atmosphere to avoid that buildup.

Now, we’re a lot smarter, and we channel this gas back into the combustion chamber by mixing it with the fuel mixture of the engine and the fresh air.

As this happens, any fuel that didn’t escape the first time is burned up. Not only does this keep pollution from entering the atmosphere, but it actually recycles and uses every last drop of fuel.

The vehicle derives more power from the fuel, and hazardous components of the exhaust gases are broken down – which means less pollution is released into the atmosphere. If we didn’t do this, that unburnt fuel would just be escaped energy.


The gas that seeps by the compression rings needs to be controlled. Otherwise, the blow-by will build up, which could cause your engine to stop running, or even to explode.

CCVs keep your engine clean and running as it should, which means not only will your engine keep running, but you’ll save money on repairs.

The CCV device also helps to lubricate the many different components of the engine, while reducing oil consumption. Less oil used = reduced maintenance costs.

Less wear on your vehicle’s internal components means your vehicle is going to run more efficiently – and for longer.

CCVs also help the passenger breathe easier, as they get rid of thetoxic fumes that would otherwise seep into the passenger compartment.

Learn More

Check out FleetServ to learn how to get diesel emission retrofits for your vehicle.

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