MAUMEE, Ohio, Nov. 5, 2013 /PRNewswire/ -- Dana Holding Corporation (NYSE: DAN) has upgraded its free Spicer™ iPhone and iPad applications with nine additional easy-to-use, technical calculators to aid its aftermarket customers in making accurate and efficient repairs. In addition to the fuel savings, driveshaft revolutions per minute (RPM), and driveline angle calculators offered in earlier versions, Dana has added calculators to convert cubic inches and liters and to configure tire height, torsional analysis, horsepower and torque, vehicle speed, rod ratio, engine displacement, gear ratio, and engine RPM. These user-friendly applications were developed to give Dana customers a quick, convenient way to crunch numbers and maximize product safety and performance. "Dana is committed to not only manufacturing quality products, but also to equipping our customers with informative literature and applications that can aid them in getting the most out of their driving experience," said Bill Gryzenia, vice president and general manager for the Dana Aftermarket Group. "We will continue to create reliable digital tools that help our consumers gain insights into our products and ensure their vehicles are operating as efficiently and safely as possible." Several of the new calculators – such as those measuring engine displacement, RPM, vehicle speed, and horsepower and torque – can be used by auto enthusiasts interested in the power of an engine. Consumers can measure a vehicle's engine displacement by pinpointing the vehicle's engine cylinder bore area, stroke of the crankshaft, and the number of cylinders. The calculator then relays the overall volume of air displaced by the engine in both imperial and metric figures. In order to calculate the potential engine RPM of an automobile, the Spicer apps offer three separate calculators to identify the axle gear ratio, the tire height, and the vehicle speed – the three numbers needed to determine RPM.