One other engine that competes with the Mack MP8 is the DD15 from Detroit Diesel engines, which also makes exactly 505 horsepower, but less torque, at 1,850 lb-ft. Mack, who recently made changes ...

In 1931, Cummins put a version of its Model U diesel engine into a Model A Duesenberg and finished in 13th place at the Indy 500. The company returned to the Indy 500 in 1934 with two 135 ...