![]() Diesel Oxidation Catalyst (DOC): 2007.5-PresentĪ diesel oxidation catalyst, or DOC, is simply a catalytic converter designed specifically for diesels. This valve opens and closes, controlling the amount of exhaust gas that is sent back to the intake system. After the cooler is an EGR valve that is connected to the intake throttle body. The EGR cooler cools down the air that is going to be passed back into the intake system. Then, a portion of gases flow to the rest of the exhaust system and a portion flow into the EGR cooler. Once the exhaust air leaves the combustion chamber it passes through the diesel particulate filter (DPF). This allows the exhaust gas to be re-burned in the combustion chamber which reduces the amount of harmful byproducts. The system works by taking exhaust gases and recirculating them through the intake manifold back into the combustion chamber. Beginning in 2007.5 model years, the 6.7 Cummins added an EGR system which includes an EGR valve and an EGR cooler. Exhaust Gas Recirculation (EGR): 2007.5-PresentĮGR isn’t a diesel-only concept, virtually all engines use some form of exhaust gas recirculation. However, they are all required and are crucial components for reducing harmful emissions produced by the 6.7 Cummins. And lastly, they are detrimental to engine performance and gas mileage. Furthermore, they are all prone to clogging which further exacerbates the backpressure and heat issues. Since the majority of this equipment is some form of catalytic converter, it is packed with expensive rare earth metals making the products expensive to replace.Īdditionally, they create a lot of backpressure within the exhaust system which is bad for the turbocharger and increases exhaust gas temps. First of all, they are extremely expensive. ![]() These systems have gotten a bad rap over time and are frequently deleted or removed from the vehicle. To reduce the amount of harmful byproducts that are released into the atmosphere, the 6.7 Cummins is packed with a number of advanced emissions systems. Components of the 6.7 Cummins Emissions System Don’t worry, this doesn’t mean owning a diesel will be harmful to your health. When breathed in by a human they can get stuck to the lining of the lungs and have various health effects. These are very small particles that are considered carcinogens. Diesel Particulatesĭiesels release particles or particulate matter through their exhaust gases. It is also dangerous to people who have preexisting breathing conditions. Nitrous oxides create smog, which is air pollution that reduces air visibility. NOx gases are produced as a chemical reaction between nitrogen and oxygen during diesel engine combustion. NOx is nitrous oxides which includes nitric oxide (NO) and nitrogen dioxide (N02). Therefore, reducing the amount of it that is released to the atmosphere via diesel exhaust gases is important. However, when we burn fossil fuels, such as diesel fuel, it creates carbon dioxide that otherwise wasn’t present in the atmosphere. Because humans only exhale the carbon dioxide that we inhale, we don’t actually increase the amount of carbon dioxide in the atmosphere. So is it really that bad? Carbon dioxide traps heat within the atmosphere and is believe to be one of the leading causes of global warming. As humans, we release carbon dioxide when we exhale. ![]() Carbon Dioxide CO2Ĭarbon dioxide is a greenhouse gas. These are the harmful exhaust gases that are produced as a result of burning diesel fuel. Since deleting emissions systems is common on diesel engines we’ll include some brief commentary at the bottom about the benefits and downsides of 6.7 Cummins emissions deletes.īefore we dig into the various components of the 6.7 Cummins emissions equipment, we need to cover the primary byproducts of diesel engine combustion. This guide will discuss the different harmful gases that diesel engines produce along with every emissions system used by the 6.7 Cummins and its purpose for reducing emissions. Today, all diesel engines have a number of emissions systems, including exhaust gas recirculation (EGR), diesel particulate filters (DPF), selective catalytic reduction (SCR), and various specialized catalytic converters. Starting around 2007, diesel emissions standards started to become a huge focus point. Diesel fuel is a lot less refined than traditional gasoline which means it burns dirtier and releases more harmful exhaust gases.
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