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Cummins Inc. remained the top U.S. heavy-duty engine builder in the first half of this year, but its market share dropped by more than 6% from the comparable period of 2010 as truck manufacturers placed more of their in-house power plants in their new vehicles.

Truck and engine makers last week outlined some of the engineering innovations they will have to develop and put onto highways over the next six years to meet recently unveiled federal heavy-truck greenhouse-gas regulations.

Manufacturing activity in the Philadelphia region dropped in August to its lowest level since March 2009, the Federal Reserve Bank of Philadelphia said Thursday.

Manufacturing activity in the New York region contracted in August for the third straight month, the Federal Reserve Bank of New York said Monday.

American Axle & Manufacturing Holdings said its second-quarter profit rose to $49.2 million, or 65 cents per share, from $25.4 million, or 34 cents, a year ago.

U.S. manufacturing activity fell to a two-year low in July, but continued to show expansion for the 24th consecutive month, the Institute for Supply Management said Monday.

Shortages of components for new heavy-duty trucks are growing, leading vehicle manufacturers to cut back their sales forecasts as their backlog of truck orders continues to mount, executives said.

Three of the world’s largest heavy-duty truck makers reported significant increases in profits and revenue for the three months ended June 30, with North American results playing a large role in all cases.

Manufacturing activity in the Chicago area fell in July, the Institute for Supply Management-Chicago said Friday.

Manufacturing activity in the Philadelphia region increased in July, the Federal Reserve Bank of Philadelphia said Thursday.