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

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.