James Vowles hopes sense prevails in Mercedes 2026 Formula 1 engine saga

As previously reported, Mercedes have found a way to increase the compression ratio of their internal combustion engine from the mandated 16:1 at ambient temperature to a performance-enhancing 18:1 when hot.

That has not gone down well with their rivals who have been reportedly pushing the FIA to change the measurement procedure of the engine compression which would ultimately make the Mercedes power unit illegal.

That would have serious repercussions on Mercedes themselves as well as their customers, McLaren, Alpine, and Williams.

While McLaren CEO Zak Brown expressed his faith in Mercedes and their power unit, Vowles also weighed in.

The Williams boss said: “My harsh line on it is the PU that we have in the car is completely compliant with the regulations. It is not a month of work but several years of work to produce the PU to that level.

"We, as a sport, have to take care that this is not a BOP [Balance of Performance] series. This is a meritocracy where the best engineering outcome effectively gets rewarded as a result, not punished as a result.

“I'm sure other teams are pissed off," the former Mercedes engineer went on. "They weren't able to achieve what Mercedes did, but we also need to take care. Right now, I don't think there's a person in the pitlane that can tell you what is the best PU, and we only focus on one detail of it.

“My hope is that sense prevails," he added, "and that we, as a sport, recognise that we are here to be a meritocracy, and that the best engineering solution wins as a result of it.

"Therefore we are where we are right now, but I maintain that our PU is completely compliant with all regulations," Vowles maintained.

The Williams Team Principal went on explaining that changing the regulations is not as simple as many imagine.

He said: “First of all, they have to come up with a regulation, and good luck with them, where you're testing power units in the conditions you're trying to run on track. Anyone that knows anything about compression ratios, even if you've done your own cars, you kind of want to do it when it's ambient.

“I'm sure they can determine a way of testing it, but the next element is that there are now two more steps. One: are we compliant even with any future regulation changes? No one knows that one particularly.

"And the second element of things is what do you do when you have effectively changed the rules? That now means that if we are not legal to it, that there are eight cars not participating on the grid.

"And that's what I meant by we, as a sport, have to really think about what the implication of this change is," he warned.

Mercedes boss Toto Wolff has maintained that his team has involved the FIA at every stage of the power unit development, which puts the governing body in a bit of a sticky situation.

“To defend the FIA, the FIA has a hard job," Vowles commented. "You have teams filled with a thousand individuals thinking about how we can interpret the rules in a clever way.

"Let’s be blunt about it, that's what teams do, and that's why we love the sport. It is difficult [for the FIA]. There's 20-odd people trying to fight against 10,000 out there on the grid. It's probably not that amount, but you get the idea behind it.

“The FIA do a really good job, generally speaking, of finding the boundary between clever interpretation and allowing it to go forward.

"What I'm stating here is that we need to take care that it's not just politically driven by other teams that didn't think of clever innovations now, and the FIA's job is to take a correct line of action on all of this," Vowles concluded.