Bernie Collins Raises Concerns Over FIA's New 'Hot' Engine Test Temperature

Former F1 strategist Bernie Collins has highlighted a significant gap between the FIA's new 'hot' engine compression ratio test and the actual operating temperatures of modern F1 power units. The upcoming test, set for June 1, will measure compression at 130°C, but Collins notes engines run at 350-400°C, questioning the test's real-world relevance. This comes amid ongoing speculation that Mercedes has exploited the previous 'cold' test to gain a performance advantage, contributing to their strong start to the 2026 season.

Why it matters:

The effectiveness of technical regulations hinges on the accuracy of the tests used to enforce them. A large discrepancy between test conditions and real-world operation could allow teams to find 'loopholes,' undermining the spirit of the rules and potentially affecting the competitive balance. With Mercedes dominating the early season, the impact—or lack thereof—of this new test is a key narrative for the 2026 championship.

The Details:

• The FIA is introducing a new 'hot' compression ratio test on June 1 to close a perceived regulatory loophole, moving from an ambient 'cold' test to one conducted at 130 degrees Celsius.
• The Temperature Gap: Bernie Collins, a former senior performance engineer and strategy chief, points out that F1 engines operate at extreme temperatures, typically between 350°C and 400°C. This 220-270°C difference means the new test may still not reflect true running conditions.
• The Alleged Advantage: It is believed that Mercedes, in particular, engineered its power unit to comply with the old cold test while achieving a higher, more powerful compression ratio when the engine reached its normal operating temperature. The estimated performance gain has been debated, ranging from negligible to several tenths per lap.
• Historical Precedent: Collins compares this to other technical clarifications, like the mid-season changes to rear wing flexibility tests in 2025, illustrating F1's continuous cycle of innovation and regulatory response.
• Mercedes' Position: The team has publicly stated that the new test will not affect them, though the true impact remains unknown until after its implementation.

What's next:

The introduction of the test in June will be a critical moment for the 2026 season. Its effectiveness in leveling the playing field—or revealing that Mercedes' advantage lies elsewhere—will shape the development race and the championship battle.

• If the test successfully curbs any performance advantage from variable compression, the competitive order between Mercedes, the chasing Ferrari, and the improving McLaren could tighten.
• Conversely, if the temperature gap is too significant, teams may continue to find ways to optimize performance outside the test parameters, leading to further technical directives from the FIA.
• All eyes will be on the performance data from the rounds following the test's introduction to gauge its real-world impact.