This retrofit technology is included on EPA's Verified Technologies List for Clean Diesel.
Highway, heavy-duty, medium heavy-duty, and urban bus; 4 cycle, model years 1994 - 2003, turbocharged or naturally aspirated non-EGR engines
|Retrofit Fuel, Max Sulfur||15 parts per million (ppm)|
|Reduction in particulate matter (PM)1||90%|
|Reduction in nitrogen oxide (NOx)1||n/a|
|Reduction in hydrocarbons (HC)1||85%|
|Reduction in carbon monoxide (CO)1||75%|
1 Baseline assumes an unmodified engine running on regular 2D (<500 ppm sulfur) fuel.
The following operating criteria must be met in order for appropriately retrofitted engines to achieve the above emissions reductions:
- The engine exhaust temperature must be at least 280° C for at least 25% of the applicable duty cycle. (As there may be significant variations from application to application, CDTi will review actual vehicle operating conditions and perform temperature data-logging prior to retrofitting a vehicle with their PM filter system to ensure compatibility.)
- The engine should be well maintained and not consume lubricating oil at a rate greater than that specified by the engine manufacturer.
- CDTi installs a back-pressure monitor and malfunction indicator light on all vehicles equipped with a Purifilter.
- The engine must be operated with a fuel that contains a sulfur content of no more than 15 ppm to achieve the reductions listed above.
- Verification Letter (PDF)(2 pp, 585 K, November 5, 2003)