
FIA rolls out phased compression tests for F1 engines
The FIA updated F1 technical regs to require engine compression ratios be measured at ambient temperature through May 31, 2026, then at both ambient and 130°C from June 1, 2026 to December 31, 2026, and only at 130°C from 2027 onward, effectively giving Mercedes a seven-race window before full hot-temperature testing applies.
