BMW M12 2.0L Inline-Four Racing Engine | Block Stamping 3858941 | Kugelfischer Fuel Injection | Historic Motorsport Powerplant
Experience a rare piece of BMW Motorsport heritage with this authentic BMW M12 twin-cam 2.0-liter inline-four racing engine, recognized worldwide for its legendary performance and engineering precision.
This unit, block stamped 3858941, represents one of BMW’s most iconic competition engines — a foundation for numerous Formula 2, touring car, and even turbocharged Formula 1 builds of the 1970s and 1980s.
Technical Specifications
| Specification | Details |
|---|---|
| Engine Identification | BMW M12 |
| Configuration | Inline-Four Twin-Cam |
| Displacement | 2.0 Liters |
| Fuel System | Kugelfischer Mechanical Fuel Injection |
| Block Stamping | 3858941 |
| Aspiration | Naturally Aspirated |
| Cooling System | Water-Cooled |
| Construction | Aluminum Alloy Cylinder Head / Cast Iron Block |
| Condition | Stored, requires servicing before use |
| Origin | Removed from a race car previously campaigned by Uberto Bonucci |
| Mileage/Hours | Not specified – race engine |
| Rebuild History | Last rebuilt a few years before removal (~15 years ago) |
| Drivetrain Compatibility | Motorsport / Classic BMW applications |
| Fuel Type | Racing Petrol (High Octane) |
| Warranty | Sold as a collectible racing component |
Proven Motorsport Pedigree
The BMW M12 engine is a cornerstone of BMW’s competition success. Based on the robust M10 road engine, it evolved into a championship-winning powerhouse for Formula 2, Group 5, and Formula 1 turbo programs.
Its design combined mechanical simplicity with extraordinary durability and adaptability — from naturally aspirated 2.0L configurations to the monstrous 1,500-hp turbocharged variants of the BMW M12/13 Formula 1 era.
This specific engine was reportedly removed from a race car driven by Uberto Bonucci, a respected Italian racer known for his participation in historic racing series and BMW motorsport events.
Condition Report
The engine was removed approximately 15 years ago after active competition use.
Last rebuilt a few years prior to storage.
Has been in long-term indoor storage since removal.
Servicing and inspection recommended before installation or operational use.
This unit is ideal for restoration, museum display, or vintage racing projects where authenticity and period-correct engineering are paramount.
Included Components
Complete BMW M12 engine assembly
Twin-cam head and valve cover
Kugelfischer fuel injection system
Block stamping 3858941 visible and legible
Race-spec ancillary components (as pictured)
Compatibility & Applications
BMW Motorsport racing cars (Formula 2, Group 5, 320 Turbo)
Historic and vintage BMW race cars using the M12/M10 platform
Collectors of BMW M Power heritage engines
Restoration projects and motorsport museums
This BMW M12 2.0L twin-cam inline-four (block 3858941) is an authentic, period BMW Motorsport racing engine, previously campaigned by Uberto Bonucci, and preserved in excellent stored condition.
Though servicing is required prior to use, it remains a rare opportunity to acquire a genuine example of BMW’s most celebrated race engine design, ideal for collectors, restorers, or classic motorsport enthusiasts worldwide.
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Les ailes avant sont parfaitement identiques aux pièces d’origine. Très bonne qualité de fabrication.
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Le kit carrosserie donne un aspect beaucoup plus sportif à ma BMW. Les ajustements sont excellents et la finition est remarquable.
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Le suivi de commande était précis et la livraison a respecté les délais annoncés. Une entreprise sérieuse.
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The engine I purchased looked very clean, and my mechanic confirmed it was in excellent condition before installation. The vehicle now drives like new again.
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Le pare-chocs avant est d’une qualité exceptionnelle. Tous les points de fixation correspondent parfaitement à ceux d’origine.
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Everything arrived well protected, including the larger body panels. The packaging was impressive and prevented any shipping damage.
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Mon garage a installé le moteur en une journée seulement grâce à la parfaite compatibilité des pièces.
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The replacement gearbox works perfectly. After several weeks of driving, shifting remains smooth and consistent.
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The replacement engine looked exactly like the photos on the website. After installation, it started immediately and has been running perfectly ever since.
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