Showing that pre-heated engines reduce emissions and improve performance of Diesel Particulate Filters (DPFs) is an Independent Emissions Testing Lab report on the Webasto Thermo Top C 5 Kw coolant heater. Test engines were set at 40 degrees Fahrenheit and 75 degrees Fahrenheit during separate test runs using an AC transient engine dynamometer to measure the effect of engine start-up temperature on PM, HC and CO emissions.
Results of the testing include:
• PM emissions were reduced by 66% by pre-heating the engine during cold weather conditions. Pre-heating also provided a 27% reduction in PM emissions during normal ambient conditions;
• NOx emissions were reduced by around 40% by pre-heating the engine to 155 degrees Fahrenheit;
• 29% reduction in CO during winter conditions, and a 62% reduction during normal ambient conditions; and
• Pre-heating the engine does not have a significant effect on the Hydrocarbon emissions.
