An independent emissions testing lab reportedly found that pre-heating engines can contribute to lower emissions and better performance by emissions control systems. The test was done with a Webasto coolant heater.
To simulate different temperature conditions during the seasonal changes and the effect caused by the Webasto heater, boundary conditions to the test engine were set at 40 degrees Fahrenheit and 75 degrees Fahrenheit during separate test runs.
Emissions testing using an AC transient engine dynamometer, was performed to determine the effect of engine start-up temperature on particulate material, hydro carbon, and CO emissions on a 2005 DT466 engine using an FTP Transient cycle with a Webasto Thermo Top C 5 Kw coolant heater (Part Number 923369). Emissions data shows that the start-up temperature has a significant effect on the engine emissions and overall performance of diesel particulate filters (DPFs).
- Engine start-up temperature has a significant impact on the emissions levels emitted by the engine.
- Particulate material emissions were reduced by 66% by pre-heating the engine during the cold weather conditions. Pre-heating also provided a 27% reduction in PM emissions during normal ambient conditions. This will help in longevity of the DPF life and can avoid more frequent regenerations and cleaning intervals.
- NOx emissions were reduced by around 40% by pre-heating the engine to 155 degrees Fahrenheit.
- Test results show a 29% reduction in carbon monoxide during winter conditions and a 62% reduction during normal ambient conditions.
- Pre-heating the engine does not have a significant effect on hydrocarbon emissions.