Ferrari is already working on the Power Unit for its 2027 Formula 1 car, with Maranello reportedly preparing to develop rather than abandon the philosophy introduced with the SF-26. Riccardo Romanelli, an engineer at Wolf Racing Cars, has analysed what has become known as Ferrari’s hot-engine concept: an extreme approach to thermal management that could become one of the foundations of the future SF-27 project.
While much of the paddock’s immediate attention is focused on the Power Unit developments due to appear at Monza, including Ferrari’s second ADUO development step for the Italian Grand Prix, work at Maranello is already looking much further ahead. The 2026 season remains in progress, but development of next year’s car is running in parallel, and Ferrari is believed to have chosen a very specific technical direction.
The central issue is Power Unit temperature management. It is far less visible than an aerodynamic upgrade, but it can have a major influence on the overall architecture of an F1 car. Ferrari’s approach would not be to cool the intake air as much as possible, but instead to tolerate substantially higher temperatures in exchange for potential benefits in weight, dimensions and packaging.
Ferrari could continue developing its hot-engine concept for the SF-27
According to the indications surrounding the project, Ferrari is not expected to completely redesign its Power Unit philosophy for 2027. Instead, the Maranello engineers would continue developing the concept introduced in 2026, retaining what is internally described as the hot-engine approach.
The philosophy begins with a different way of managing intake-air temperature. Ferrari is reportedly working with values that could reach approximately 115°C, while some rival manufacturers are believed to operate at considerably lower temperatures, around 70°C. These figures remain unofficial and have not been confirmed by Ferrari.
The precise number, however, is not the most important part of the discussion. What matters is the technical reasoning that could have led Ferrari towards such an unconventional solution.
Why would Ferrari deliberately accept hotter intake air?
At first glance, the idea appears counterintuitive. Hotter air contains less oxygen for the same volume, while higher temperatures can make the combustion process more difficult to manage. They can also increase thermal stress inside the combustion chamber.
Riccardo Romanelli starts his explanation from a basic principle of turbocharged-engine thermodynamics. When the compressor increases the pressure of the air heading towards combustion, its temperature inevitably rises as well. In a dynamic system such as a Formula 1 Power Unit, compression cannot occur without generating heat.
This creates an important engineering challenge. Higher intake temperatures can restrict the amount of ignition advance available and increase the possibility of undesirable combustion phenomena, including detonation in peripheral areas of the combustion chamber.
The conventional response is therefore to cool the compressed air as much as possible through the intercooler. Ferrari, however, appears to have accepted a different compromise.
The main advantage could come from Power Unit packaging
According to Riccardo Romanelli, the principal benefit would not necessarily be found directly inside the combustion process. Instead, the biggest gains could come from everything surrounding the engine.
If Ferrari accepts a higher intake-air temperature, it can potentially use a smaller intercooler. That immediately creates a chain of possible advantages:
- lower overall volume;
- reduced weight;
- less coolant;
- more compact pipework;
- greater freedom in positioning components.
In Formula 1, every cubic centimetre recovered inside the bodywork can be valuable. Reducing the size of the cooling installation provides engineers with greater freedom when packaging the Power Unit and, consequently, when shaping the car around it.
This is one reason why Ferrari may have chosen a different route from other manufacturers. It also demonstrates why Power Unit development cannot be separated from the wider car concept, a relationship regularly explored in our Ferrari technical analysis coverage.
Power Unit packaging can directly influence aerodynamics
The engine does not exist independently of the chassis and bodywork. Romanelli emphasises that component packaging can have a direct effect on the overall balance of the car.
A more compact cooling system can allow engineers to:
- tighten the bodywork;
- reduce the internal dimensions of parts of the sidepods;
- improve airflow management;
- control overall mass and the centre of gravity more effectively.
None of those benefits automatically guarantees a faster Formula 1 car. What they can do, however, is give the aerodynamic department greater design freedom. A thermal-management choice can therefore become part of a much wider performance philosophy.
Ferrari’s pre-chamber combustion system changes the equation
One of the most significant parts of Riccardo Romanelli’s analysis concerns Ferrari’s combustion chamber. The Power Unit uses a pre-chamber system, a highly sophisticated solution that is now well established in Formula 1.
According to Romanelli, the pre-chamber significantly changes the way combustion can be managed. Different local air-fuel ratios develop inside the pre-chamber compared with the main combustion chamber, allowing the combustion process to be initiated differently from that of a more conventional engine.
The consequences can be important. Flame propagation can become faster and more controlled, giving engineers the opportunity to develop different combustion strategies even when intake temperatures are higher.
That is the key point behind Ferrari’s philosophy. The objective is not simply to operate the engine at a higher temperature. The entire thermal system has to be engineered so that those temperatures remain manageable.
Materials and thermal management must work together
Romanelli stresses that such an approach cannot be introduced in isolation. Higher operating temperatures require a Power Unit designed specifically around them.
That could involve:
- different materials;
- a specifically designed cylinder head;
- careful management of the combustion chamber;
- precise control of internal Power Unit temperatures.
Ferrari’s philosophy would therefore be based on a complex balance between thermal efficiency, reliability and energy management rather than simply trying to minimise intake-air temperature.
The approach also provides useful context for Ferrari’s wider 2026 Power Unit development, which has included work aimed at extracting more performance ahead of Monza. The Scuderia has also been preparing a reported 15-horsepower engine step for the Italian Grand Prix.
Thermodynamic efficiency is the real target
The ultimate objective is not hotter air in itself. Ferrari is trying to achieve greater overall thermal efficiency from the Power Unit.
According to Riccardo Romanelli, if Ferrari can maintain an efficient combustion process despite the higher intake temperature, the advantages elsewhere in the system could more than compensate for the initial disadvantages.
In Formula 1, efficiency is not simply a question of producing more horsepower. It means converting a greater proportion of the energy contained in the fuel into useful energy that can propel the car.
That is also where the electrical side of the Power Unit becomes increasingly important. The balance between combustion efficiency and hybrid-energy use is central to the wider performance picture, particularly as manufacturers continue to refine their 2026 concepts. Ferrari’s relative position in that development battle has also been reflected in the latest ADUO performance comparisons.
Deployment makes the electrical system increasingly important
Romanelli points out that the internal combustion engine can no longer be analysed as an isolated component. A modern Formula 1 Power Unit functions as one integrated system.
Energy recovered during a lap must be distributed through increasingly sophisticated deployment strategies. Greater efficiency from the combustion engine can therefore also make it possible to manage the energy available to the hybrid system more effectively.
One important phase is lift and coast, when the driver comes off the throttle before reaching the braking zone. During this phase, the engine can contribute through engine braking while the car recovers electrical energy.
According to Romanelli, efficient thermal management could have a positive influence on this wider energy balance as well. The significance of the hot-engine concept must therefore be judged across the complete Power Unit rather than through peak combustion-engine output alone.
Ferrari continuing with the concept would be an important signal
One of the key points concerns the continuity of Ferrari’s design philosophy. If Maranello does retain this approach for the 2027 project, the decision would send a clear message.
It would suggest that the information collected throughout the 2026 season is supporting Ferrari’s original simulation work. Romanelli notes that one of the fundamental principles of motorsport development is the willingness to reverse course when a concept fails to produce the expected results.
If a technical direction is instead retained and developed further, it generally indicates that engineers continue to see scope for improvement. Ultimately, however, the dyno and then the circuit will determine whether this interpretation proves correct.
Reliability will be crucial to Ferrari’s hot-engine philosophy
Higher operating temperatures naturally raise questions about reliability. Romanelli observes, however, that Ferrari’s Power Unit has so far demonstrated an overall level of reliability during the season that is important for the viability of such an aggressive thermal strategy.
An extreme concept would offer little value if Ferrari repeatedly had to reduce performance in order to protect the engine. Up to this stage, the Scuderia appears to have found a satisfactory compromise between performance and reliability.
The experience accumulated across the entire 2026 campaign will therefore provide the foundation for development of the 2027 Power Unit. The remaining rounds on the 2026 Formula 1 calendar will give Ferrari further opportunities to collect data under different thermal and energy demands.
What to watch during the remaining 2026 Grands Prix
We can also identify several areas worth monitoring during the closing part of the season. If Ferrari genuinely intends to continue with the hot-engine philosophy, development will not be judged purely by maximum Power Unit output.
Particular attention should be paid to:
- Power Unit behaviour at circuits with high energy demands;
- temperature management over long stints;
- energy-recovery efficiency;
- the evolution of the car’s packaging in future specifications.
Those areas could provide the clearest indications of whether the technical path chosen at Maranello is producing the expected results. Ferrari’s decision to evolve rather than abandon the concept would suggest that the SF-26 is serving not only as the team’s 2026 challenger, but also as an important development platform for the Power Unit philosophy that could underpin the SF-27.
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