Red Bull are at the centre of a growing controversy ahead of the 2026 F1 season, with concerns mounting among rival teams over their use of a loophole in the new engine regulations.
The 2026 season will bring significant changes to F1, as the introduction of new power unit rules has led to a comprehensive overhaul that includes revised aerodynamic regulations. The MGU-H has been dropped to cut costs, electrical power output has been increased, and there’s now a move to fully sustainable fuels.
The 2026 F1 season also marks the start of a new era for Red Bull, as they will also race with an engine that they have built themselves for the first time ever. Red Bull Powertrains struck a technical partnership with Ford, as well, to gain the brand’s help with battery technologies.
Red Bull suspected of piston placement loophole
The 2026 Red Bull car made its debut in Detroit this week, though it was only a livery launch, with the real car not expected to be seen until testing begins. In Ford’s backyard, the spotlight wasn’t just on the design—attention also turned to growing suspicions that Red Bull may have found a way to exploit a grey area in the upcoming engine regulations.
According to FunoAnalisiTecnica, one theory about how Red Bull have potentially gained an advantage through the 2026 engine rules has also now become the ‘most widely accepted’ among the F1 paddock. The ‘suspicion’ relates to Red Bull’s rate of compression in their ICE.
The suspicion revolves around how they might be controlling thermal expansion within the engine. The specific focus is on whether they’ve managed to bring the piston closer to the cylinder head during operation.
Red Bull’s 2026 power unit meets rules, says engine chief Ben Hodgkinson
The loophole in question involves rule C5.4.3 of the new regulations, and it could be worth up to three to four tenths per lap. That’s led Audi, Ferrari, and Honda to seek clarification from the FIA, with a meeting on the topic scheduled for January 22.
Ben Hodgkinson, head of Red Bull Powertrains, is confident their engine design complies with what he describes as “super clear” rules. He also questioned whether any engineers who missed this aspect of the regulations should even be working in Formula One.
“It’s frustrating, really, some of this stuff,” Hodgkinson told The Telegraph. “For me as an engineer, it’s frustrating that the press has got hold of this.
“I think any engineer worth their salt who doesn’t understand about thermal expansion doesn’t belong in this sport. Doesn’t deserve to be an engineer really.
“Almost every material changes with temperature. So it’s understanding how materials behave in different temperatures, pressures, stresses [and] loads. That’s literally our job.”
Hodgkinson also noted via F1i that Red Bull had pushed their reading of the 2026 rules as far as possible but stressed he believes everything they’ve done is within the law since the rule deals with conditions outside active operation.
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