Northstar Engine Informationby Rob Wagner
General Motors' Northstar engine is the automaker's technologically advanced powerplant originating from the Corvette LT5 all-aluminum V-8. Designed by the performance-oriented Lotus, the Northstar is primarily used in Cadillac automobiles and SUVs.
The Northstar debuted in the two-seater Cadillac Allanté in 1992, and although that car ceased production in 1993 the Northstar V-8 continued in other Cadillac, Buick and Oldsmobile models.
The Northstar originally generated 295 horsepower, then got a boost to 300 from 1996-2004. Its present output is 320 hp.
Early Northstar engines were notorious for burning oil and head gasket failure, while 2000-2001 models experienced heavy carbon deposits in the combustion chamber.
GM pioneered fail-safe mechanisms in its Northstar V-8s that included allowing the engine to run if the ignition timing is failing, or run for a short time if there is no coolant in the system.
GM's Nylon 66 thermoplastic intake manifold provides cooler air intake, along with a sequential fuel-injection system to increase fuel efficiency.
The 2006-2008 Cadillac XLR-V and STS-V models were equipped with a supercharged 4.4-liter version of the Northstar engine that generated 443 hp for the XLR-V and 469 hp for the STS-V.
- General Motors