To have fun 50 years of the M division, BMW has been exhibiting off once-secret prototypes in a sequence of movies, however the two proven within the newest video launched Wednesday are among the many most uncommon but. As soon as upon a time, BMW constructed an E34 M5 convertible and a Z3 M Roadster prototypes with V-12 engines. Each vehicles at the moment are a part of an M fiftieth anniversary exhibit on the BMW Museum.
It is unclear why BMW M constructed a convertible model of a four-door sedan, however it did an intensive job. With no roof pillars to connect the seatbelts to, engineers relocated them to the seats themselves. The automobile’s high mechanism was additionally designed to protect trunk house.
BMW M’s mysterious V-12 powered Z3 roadster, as posted to Fb
The E34 M5 was powered by a 3.8-liter inline-6, which despatched 340 hp and 295 lb-ft of torque to the rear wheels by means of a 6-speed guide transmission. An open-air expertise of that powertrain does sound interesting. This wasn’t the one oddball E34 BMW’s skunkworks constructed; it additionally put in the 6.1-liter V-12 from a McLaren F1 in an E34 M5 wagon.
Compared, the V-12 Z3 M Roadster appears nearly standard. The prototype first broke cowl in 2012, and is powered by what is probably going an M73 engine; the 5.4-liter V-12 was used within the 7 Sequence when the Z3 was in manufacturing. It produces 321 hp, an enormous step up from the inventory M Roadster’s 240 hp.
Becoming the V-12 into the Z3’s engine bay was simpler than it may appear. Whereas the automobile itself is tiny, the engine is roughly the identical size because the inventory M Roadster’s inline-6. It is simply that there are two banks of cylinders as a substitute of 1. The heavier V-12 possible affected the automobile’s weight distribution as effectively.
The video additionally features a temporary glimpse of the 1991 BMW M8 prototype, which is a part of the identical museum exhibit. Primarily based on the E31 8 Sequence, it has a extra highly effective model of that technology’s S70 6.0-liter V-12 making 550 hp. BMW determined to not do a manufacturing model, nonetheless, and the prototype was stashed away. It was just lately restored to working situation by BMW.
BMW M’s experimentation did not finish there. It stuffed the engine from its Le Mans-winning V12 LMR race automobile into an X5, creating an SUV that might lap the Nürburgring in below eight minutes.
Extra just lately, BMW additionally experimented with CSL variations of the M3, M5, M6, and M2. None of those made it to manufacturing, however BMW did just lately revive the CSL badge for the M4.