This retrofit technology is included on EPA's Verified Technologies List for Clean Diesel.
On this page:
Technology specifications
| Engine Model/Application |
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.
Criteria to achieve emission reductions
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 from EPA
You will need Adobe Reader to view some of the files on this page. See EPA’s About PDF page to learn more.- Verification Letter (PDF)(2 pp, 585 K, November 5, 2003)