Long before the current BMW M8 came into existence, the car manufacturer developed a one-off, high-performance variant of the E31-generation 8-Series. While it failed to make the production line, it remains a seriously impressive piece of kit.
Featured on this video from BMW Group Classic, the special BMW M8 prototype is unique not only from regular 8-Series models back in the day but also has something not even the existing M8 has: a V12 engine.
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The V12 powering the M8 prototype is a modified version of the 6.0-liter V12 that was used by the 850i Coupe. BMW explains that there are just three examples of this engine in existence, all of which were built in 1990. The German automaker developed a distinct air intake system for the engine made from lightweight carbon fiber. The V12 also has a dry-sump lubrication system and independent throttle bodies.
One particularly intriguing aspect of the powertrain is the fact that the oil reservoir is located in the trunk because there wasn’t enough room to install it under the hood. This necessitated the use of oil lines that run from the reservoir, through the roof, and into the V12.
BMW had the M8 prototype parked at one of its facilities for many years but when it decided to make it run again, it discovered that the fuel tank was disintegrating from the inside. As such, a new fuel tank had to be manufactured for the car. It is now in perfect running order and the automaker plans to soon bring it back onto the road.