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Particle size distribution, number, and mass emissions from the exhaust of a 92 kW 1999 Isuzu 6BG1 nonroad naturally aspirated diesel engine were measured. The engine exhaust was equipped with a Dry System Technologies® (DST) auxiliary emission control device that included an oxidation catalyst, a heat exchanger, and a disposable paper particulate filter. Particle measurement was taken during the ISO 8178 8-mode test for engine out and engine with the DST using a scanning mobility particle sizer (SMPS) in parallel to the standard filter method (SFM), specified in 40 CFR, Part 89. The DST efficiency of removing particles was about 99.9 percent based on particle number, 99.99 percent based on particle mass derived from number and size. However, the efficiency based on mass derived from the SFM was much lower on the order of 90 to 93 percent.

Transit agencies continue to be the focus of heavy-duty diesel engine emission reduction programs by using Federal regulations as well as self-imposed mandates to reduce smoke and particulate emissions. Such is the case with the Miami Valley Regional Transit Authority, which wanted to characterize the emissions of a 1985 model year Detroit Diesel Corporation (DDC) 6V-92 TA diesel engine that was rebuilt using DDC Upgrade Kit 10-B. In addition to determining the baseline exhaust emissions from the upgraded engine, two separate emission reduction technologies were evaluated. The first system evaluated was an electrically regenerated particulate trap oxidizer developed jointly by Donaldson and 3M The second technology evaluated was an ethanol injection system in conjunction with an oxidizing catalyst designed and manufactured by Midwest Power Concepts (MPC) Emission tests were performed in accordance with the heavy-duty diesel engine transient Federal Test Procedure (FTP).