Here is the most powerful V12 engine of all time
This page is translated from the original post "Voici le moteur V12 le plus puissant de tous les temps" in French.
- 13/08/2025 15:18
Zenvo Automotive unveils the “Mjølner,” a production naturally aspirated V12 engine designed without compromise to power the future hypercar Aurora.
With 1,250 horsepower available at high revs and a maximum engine speed of 9,800 RPM, it is the most powerful engine in its class. Its uniqueness lies in the combination of an ultra-expressive mechanics and a high-performance hybrid system, all while meeting global emission standards.
The engine block is entirely new. Its 60-degree V configuration was chosen for its natural balance and compactness, optimizing crankshaft rigidity and limiting unwanted vibrations. The forged crankshaft is of the “flat-plane” type, offering a quicker rev-up and a sharper sound than a traditional cross-plane V12. The pistons, made of high-strength alloy, receive an anti-friction treatment, while the titanium connecting rods ensure both strength and lightness.
The timing is ensured by a dual overhead camshaft per bank of cylinders, with variable timing to optimize breathing at all RPMs. The intake benefits from a carbon fiber plenum and variable-length runners to maximize torque at low RPM and power at high RPM. The high-pressure multi-point direct injection allows for precise atomization, improving thermal efficiency and reducing particulate emissions.
Zenvo wants to compete with electric vehicles
To withstand speeds close to 10,000 RPM, the lubrication adopts a dry sump with a multi-stage pump, ensuring a constant oil supply even in circuit use with strong lateral accelerations. The cooling relies on a high-capacity circuit combined with specific heat exchangers for the hybrid system.
The hybrid plays a central role in the driving experience. Integrated with the transmission, it provides an immediate boost in torque during accelerations and compensates for any loss of responsiveness at low RPM, all while helping to reduce consumption during smooth driving.
The electronic management has been custom-developed to coordinate the thermal engine and the hybrid by continuously adapting the ignition timing, injection pressure, and torque delivered by each energy source. A titanium exhaust system, with high-efficiency catalysts, preserves the characteristic sound of a flat V12 while meeting the strictest regulations.
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For Jens Sverdrup, president of Zenvo, yielding to the ease of an existing engine was out of the question. The Mjølner was born to embody the philosophy of the Aurora: extreme power, strong personality, and global viability. Its first public appearance at the Monterey Car Week should confirm that in the era of electrification, a V12 can still be a masterpiece of mechanical craftsmanship.
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