When the controversy broke out in the Dutch GP, we immediately said that it would lead nowhere. And so it was. Red Bull Racing had written to the FIA sending a request for regulatory clarification to the FIA on the Mercedes power unit.
Milton Keynes’s team wanted to know if the performance increase of the Brixworth power unit after Silverstone, valued at around twenty horsepower in the acceleration phases, was legal or not, suggesting that Brixworth had found a way to cool the air destined for the plenum of the 6 cylinders, bypassing the FIA sensor.
Article 5.6.8 of the F1 Technical Regulations states that: “The air temperature of the engine plenum must be more than ten degrees higher than the ambient temperature”.
The measurement takes into account a lap average, because this varies according to the use of the engine and the flow of air coming from the intercooler: it is colder at low revs, and becomes warmer at high speeds, so there may be peaks in which the expected ten degrees more are not read.
Compliance is measured by the FIA sensor installed in the plenum: but Jo Bauer’s commissioners did not find any anomalies, although the Red Bull technicians (primed by the former Mercedes who landed in Milton Keynes?) Had the doubt that the Mercedes plenum, much larger Compared to the 2020 version, it allows an air passage that varies according to the flow rate, skipping the sensor reading and bringing a cooler flow to low speeds.
According to German Auto Motor und Sport, the International Federation replied to Red Bull Racing that nothing illegal was registered for which the Mercedes engine complies. Are we betting that the unit that Honda will supply to the Milton Keynes team next year will have a nice big plenum?