Cadillac Northstar LMP

The Cadillac Northstar LMP was a series of Le Mans Prototypes built by Cadillac for use in the American Le Mans Series as well as an attempt to return Cadillac to the 24 Hours of Le Mans since they first entered in 1950. The Northstar LMPs were named after the Northstar V8 engines which powered them. The Cadillac project ran from 2000 until 2002 when General Motors decided to cancel the project to concentrate solely on their Chevrolet Corvette program.

In planning the new Cadillac LMP project, GM turned to Riley & Scott, builders of the successful Mk III chassis. Riley & Scott developed a from-scratch LMP based around a bespoke carbon fiber monocoque. The new design featured elements of Cadillac's new Art & Science design theme such as the functional egg-crate grill on the nose, as well as the addition of large side scoops to feed the turbochargers.

A highly modified 650 hp (485 kW) version of this engine was used by General Motors racing division initially for Indy Racing League competition starting in 1995, then was later used in the Cadillac Northstar LMP program in 2000. Both engines retained the 4.0 L capacity, but the Northstar LMP version was twin-turbocharged. The engine for the Northstar LMP was based on a smaller 4.0 Liter variant of the Northstar used in Cadillacs, known as the L47, used in GM's Oldsmobile Aurora sedan. It had already been adapted for racing in 1995 for use in the Indy Racing League, but was thoroughly modified in order to not only increase power, but increase longevity. McLaren Engines assisted in the development of the new prototype engine, while Ishikawajima-Harima Heavy Industries (IHI) produced twin turbochargers to increase output.

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