Cdx 182a final exam - Study guides, Class notes & Summaries

During the last few years, emissions from heavy-duty diesel trucks and buses have: - ANSWER-been significantly reduced. Down speeding is: - ANSWER-downshifting a transmission to increase engine speed. upshifting a transmission to decrease engine speed. using low axle gear ratios to reduce engine speed. Technician A says that diesel engines supply only enough air to completely burn all the fuel in the combustion chamber. Technician B says that diesel engines supply excess air to the c...