Diesel and natural gas engine maker Cummins India reported a 23% rise in second-quarter profit on Tuesday as lower expenses helped offset slowing engine demand. The Indian unit of U.S. truck engine maker Cummins reported a consolidated profit of 3.29 billion rupees ($39.52 million), up from 2.67 billion rupees last year. Cummins India’s total expenses fell 5.1% to 16.20 billion rupees on lower cost of raw materials such as aluminium and steel. Income from operations marginally dipped 1.8% due to weaker demand for its newly launched and more expensive power generator sets, made to meet the revised emissions guidelines. The new emission norms by the Central Pollution Control Board came into effect from July 1 and target a near-90% reduction in emissions of particulate matter and nitrogen oxides.