F1: FIA rewrites its checks as suspicion hangs over Mercedes
The season opener left the paddock uneasy. Talk about the legality of the German engines won’t die down. The technical rules cap compression at 16:1 — a limit Audi and Porsche specifically pushed for before the season started.
At the Australian opener officials measured engines cold. Everyone sailed through. Still, rivals whisper Mercedes might be running closer to 18:1 once the car’s on track. Thermal expansion at extreme temps could explain that extra horsepower.
Those whispers turned into a story when a former member of the German project, now working for another team, leaked details. With tension rising, the governing body had to act and clear the air.
New verification protocol starts in June
Vincent Pereme, the technical delegate for power units, had initially signed off the V6 built at Brixworth. Fierce talks in the advisory committee ended with a unanimous tweak to the rulebook.
The rule now says checks stay at ambient temperature until the end of May. After that the protocol flips to a double check. Scrutineers will take readings at 130 degrees. The text explicitly bans any internal device designed to boost compression past the legal limit while the car is running.
There’s a technical catch. Hot checks will allow a small tolerance set at 16.7:1. The reference temperature will be taken from the engine oil.
Are mechanical tweaks inevitable?
The German camp insists their current hardware will sail through the new tests. Plenty of engineers in the paddock disagree. They reckon the cylinder head will need reworking — specifically a mandatory widening of the pre-chamber port to control filling at extreme temperatures.
Petronas’ sustainable fuel is part of this puzzle. It was tuned for this extreme setup. If compression figures are physically dialed back, that fuel could lose some of its edge.
A timetable that helps the teams
The roll-out date wasn’t chosen by accident. The first of June matches the usual life cycle of parts. The annual allocation limits teams to three engines across a 24-race calendar. Each power unit therefore covers roughly eight race weekends.
The eighth round lands in Monaco. If changes are needed, they’ll be fitted to the second unit of the season, so mechanics don’t have to rip up their plans midstream.
Meanwhile rival teams are lining up their own answer. They can apply for development concessions after the Miami Grand Prix if their power shortfall tops two percent. The FIA would rubber-stamp any approvals this summer, which gives the leaders plenty of time to pull away in the standings.
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