GM Ultra Engine

Ultra was the codename for a planned family of DOHC V8 engines that General Motors was developing to replace the Northstar as the V8 for its premium vehicles. Little was published about its specifications, but its smallest displacement was expected to be close to the Northstar's, it would probably have taken technology from the High Feature V6 family, including continuously variable valve timing on both intake and exhaust and gasoline direct injection, and it was expected to suit both longitudinal and transverse installations, including a rumored V8 version of the Lambda crossover SUVs. GM had planned to build it at the Tonawanda engine plant but cancelled development in January 2008, so the engine never reached production. A twin-turbo 4.5 litre V8 based on the twin-turbo 3.6 litre V6 later powered the 2013 Cadillac Elmiraj concept.