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Mercedes-Benz trainees at the Rastatt plant built the B55 in 2009, combining a B-Class hatchback with a naturally aspirated 5.5-liter V8 rated at 388 horsepower. The one-off project used parts from several Mercedes models; its builder estimated it could reach 62 mph in under six seconds.
Mercedes-Benz trainees at the Rastatt plant built a one-off B-Class hatchback with a 388-horsepower, 5.5-liter V8 in 2009, turning the compact model into a rear-wheel-drive performance project called the B55. The museum’s account of the car brings attention to a factory training exercise that paired an everyday hatchback with components from Mercedes’ AMG-era parts supply.
The B55 began as a B200 CDI diesel that had been set aside for training at the German assembly plant, where the B-Class was produced. According to a Mercedes-Benz press release from the time of the car’s reveal, plant manager Peter Wesp proposed a trainee project based on the model, and vocational training foreman Andreas Würz concluded after measuring the car that a V8 could fit. The trainees were challenged to complete the conversion without extensive changes to the body shell.
They installed a naturally aspirated 5.5-liter V8 rated at 388 horsepower and 391 lb-ft of torque. The engine had been a mainstay of AMG models, although Mercedes was moving toward the larger 6.2-liter M156 V8 around the time the B55 was built. The B55 also used a rear axle from a W210 E-Class on a custom subframe, brakes from a C32 AMG and aftermarket K&W coilovers. The steering and exhaust created packaging challenges; the team fabricated a custom exhaust from spare parts, with twin outlets in the center of the rear bumper.
AMG Power in a Compact Hatch
The B55 illustrates how a factory training project could connect Mercedes’ small-car production with the company’s contemporary performance hardware. Its standard-looking B-Class body concealed an engine and drivetrain drawn from larger Mercedes models, a combination that made the project unusual within the brand’s lineup. It also demonstrates the practical work behind an engine swap: fitting the V8 was only part of the job, with the steering, exhaust, rear axle and supporting structure requiring their own solutions.
The car was not presented as a production model. Its significance lies in its status as a one-off trainee build and in the way it used the Rastatt plant’s own model as the basis for a hands-on engineering exercise.
From Diesel B-Class to B55
Mercedes introduced the B-Class in 2005, positioning it as a compact, high-roof hatchback sold mainly outside the United States. The model’s practical layout and front-wheel-drive origins were far removed from the rear-wheel-drive V8 setup that the trainees created for the B55. The car’s restrained appearance helped it retain the look of an ordinary B-Class despite its extensive mechanical changes.
The V8 also reflected a particular period in Mercedes performance engineering. AMG had used the naturally aspirated 5.5-liter engine widely, but was beginning to adopt the 6.2-liter M156. Mercedes later moved to turbocharged 4.0-liter V8s across its AMG range amid emissions pressures, according to the source report. The B55 therefore combined a compact model with an engine associated with an era of large, naturally aspirated AMG powerplants.
Performance Figures Remain Estimates
The available account does not provide independently measured acceleration figures, a verified top speed or a detailed account of how the B55 performed in testing. The under-six-second estimate for 0-to-62-mph acceleration came from Würz at the time. The source material also does not say whether the one-off car remains operational or where it is currently displayed.
Museum Account Revives the Project
The recent development is the Mercedes-Benz Museum’s Instagram post recalling the B55 project. The source material identifies no planned production version, new engineering program or future milestone for the car. Further details about its present condition or location have not been provided in the cited accounts.
Key Questions
What was the Mercedes-Benz B55?
The B55 was a one-off B-Class hatchback built by trainees at Mercedes-Benz’s Rastatt plant in 2009. It was fitted with a naturally aspirated 5.5-liter V8.
How powerful was its V8?
The engine was rated at 388 horsepower and 391 lb-ft of torque, according to the source report.
Was the B55 a production Mercedes model?
No production run is described in the source material. The B55 was a trainee-built, one-off project based on a diesel B200 CDI.
How fast was the B55?
Foreman Andreas Würz estimated at the time that it could accelerate from zero to 62 mph in under six seconds. The supplied account does not include an independently measured time.
Source: rss
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