Verified Technologies for SmartWay and Clean Diesel

This retrofit technology is included on EPA's Verified Technologies List for Clean Diesel.

• Technology specifications
• Criteria to achieve emission reductions
• Verification letters from EPA

Technology specifications

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Criteria to achieve emission reductions

The following criteria must be met in order for appropriately retrofitted engines to achieve the aforementioned emission reductions:

1. The engine must be used by an on-road motor vehicle with a manufacturer's Gross Vehicle Weight Rating of over 14,000 pounds.
2. The engine may or may not have exhaust gas recirculation (EGR).
3. The engine may or may not be certified to have an original equipment manufacturer (OEM) diesel oxidation catalyst (DOC).
4. The engine must not be certified to have an OEM diesel particulate filter (DPF).
5. The engine must be certified to a PM emission level of at most 0.1 grams per brake horsepower hour (g/bhp-hr), and greater than 0.01 g/bhp-hr.
6. The NOx to PM ratio of the engine, calculated using the certified values for NOx and PM, must be at least 21.
7. For engines with NOx to PM ratio of 23 or greater, other than model year 2004 to 2006 Caterpillar ACERT engines (C7, C9, C11, C13, and C15), the application must have a duty cycle with an exhaust temperature profile that:
   • a. Results in a Weighted Average Temperature (WAT) that is at least 263 degrees Celsius; or
   • b. Is either greater than 245 degrees Celsius for at least 40 percent of the time or, greater than 310 degrees Celsius for at least 10 percent of the time.
8. For engines with NOx to PM ratio of less than 23 and model year 2004 to 2006 Caterpillar ACERT engines (C7, C9, C11, C13, and C15), the application must have a duty cycle with an exhaust temperature profile that:
   • a. Results in a WAT that is at least 270 degrees Celsius; or
   • b. Is greater than 275 degrees Celsius for at least 40 percent of the time
9. The engine must be rated to at least 100 horsepower (hp) and no more than 600 hp.
10. The engine must remain in its original certified configuration, except that if an OEM oxidation catalyst is present, it may be removed if the LXF system is installed. Should the LXF system be removed, the OEM oxidation catalyst must be re-installed, returning the engine to its original certified configuration.
11. The engine must have a four-stroke combustion cycle.
12. The engine must be turbocharged.
13. The engine may be mechanically or electronically controlled.
14. The engine must be well maintained and must not consume lubricating oil at a rate greater than that specified by the engine manufacturer.
15. Lube oil, or other oil, must not be mixed with the fuel.
16. The engine must be operated on fuel that has a sulfur content of no more than 15 parts per million by weight.
17. Each vehicle that is a candidate for installation of the LXF system based on the WAT criterion must first have its exhaust temperature measured and recorded for an appropriate period of time during typical operation. CDG or its authorized representative must maintain these data for each LXF-equipped vehicle and make them available to EPA upon request.

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Verification Letters from EPA

• Verification Letter with Engine Families for Clean Diesel Group LLC. (PDF)(6 pp, 1 MB, February 14, 2019)