Alpine Urges Rivals to Protest Mercedes Engine Compression Ratio

Alpine managing director Steve Nielsen has publicly urged Red Bull, Ferrari, Audi and Honda to lodge a formal protest over Mercedes' 2026 power unit, which temporarily raises its compression ratio from the regulated 16:1 to 18:1 when the engine runs hot—a gain that could shave a few tenths of a second per lap.

Why it matters:

• The temporary boost raises power enough to gain a measurable lap‑time advantage, directly affecting race results.
• Allowing post‑hoc rule challenges could set a precedent that any clear regulation becomes negotiable, destabilising the technical framework of the sport.

The details:

• The 2026 rule fixes the maximum compression ratio at 16:1, measured at ambient temperature.
• Mercedes HPP uses a heat‑expanding material that pushes the ratio to 18:1 during operation, then cools back to 16:1 for scrutineering.
• Red Bull, Ferrari, Audi and Honda plan to ask the FIA at the upcoming Bahrain F1 Commission meeting to change the measurement point to operating temperature.

What's next:

• The F1 Commission meeting in Bahrain next week will be the first chance for a joint protest, but any rule change still requires FIA and FOM approval.
• Nielsen warns that altering a clearly‑written rule could open the door to future technical disputes, undermining the sport’s stability.