Panel: SCR


Meeting 2010 EPA Emissions Standards. Improving Performance.

SCR technology is simple, clean, reliable and hassle-free. It meets 2010 EPA emissions standards and improves performance. SCR, or Selective Catalytic Reduction, is the cleanest diesel emissions technology available. It delivers more horsepower, torque and better fuel economy than other emissions technologies.

SCR Frequently Asked Questions

SCR, 2010 Emissions Standards and the RV Industry


Q: What are the new EPA 2010 diesel emissions standards?

A: EPA 2010 diesel engine emissions standards reduce the amount of nitrogen oxides emissions into the atmosphere for cleaner air and a cleaner environment. EPA mandates are pretty common and have been passed in ’94, ’98, ’02, ’07 and now in 2010.

Q: What is SCR?

A: SCR stands for Selective Catalytic Reduction. SCR simply adds a Diesel Exhaust Fluid (DEF) into the exhaust gas and filters it through a catalyst to convert NOx into nitrogen and water, which is released into the air. It is the next-generation technology that almost every diesel engine manufacturer is using to comply and the technology that almost all RV and commercial truck OEMs have chosen to comply with the new 2010 Emissions Standards.

Q: Is there an alternative solution available to meet the 2010 EPA requirements?

A: Only one manufacturer is pursuing a divergent path from the rest of the industry, opting to intensify the EGR technology used to reach the EPA 2007 standards, calling it Advanced EGR (AEGR). However, all other motorhome and engine OEMs have selected SCR because of its proven technology and benefits to the RV owner and the environment.

Q: Why are the overwhelming majority of engine, truck and motorhome manufacturers using SCR?

A: Because SCR is a Simple, Clean and Reliable technology:

• Simple: SCR is built upon existing technology and simply adds a Diesel Exhaust Fluid (DEF) and a catalyst to remove additional particulates and emissions.

• Clean: SCR technology has been certified by the EPA to meet its new standards.

• Reliable: Although relatively new to North America, SCR is a proven technology that has been in use in Europe since 2006 with over 600,000 SCR equipped commercial vehicles in service over hundreds of millions of miles. In addition, more than 30 million test miles were run in the U.S. before SCR was released to the market.

Q: Are there other benefits of SCR technology?

A: Yes, many. In addition to meeting 2010 emissions standards, SCR gives you 5 to 8 percent better fuel economy, more torque and more horsepower versus a similarly equipped EPA 2007 engine using EGR technology.

Q: Does either SCR or AEGR require additional components or add additional weight?

A: Yes, they both do. SCR requires only the addition of a DEF tank and SCR catalyst, while AEGR will require a larger engine to achieve similar horsepower and torque ratings, a larger radiator for cooling and, in some cases, an additional turbo. In the end, both of these technologies are expected to add a similar amount of additional weight to the motorhome.

Q: How easy is it to refill the DEF tank?

A: It’s hassle-free. DEF is as simple and quick to refill as windshield wiper fluid and is readily available at thousands of travel centers and auto-parts supply stores nationwide.

SCR FAQs – Download PDF

SCR Technology – Download PDF