Formula One ’s governing body has reached a compromise with manufacturers that changes the way the compression ratio will be measured midway through this season and in the 2027 season. New engine rules set out a compression ratio of 16:1 — a measurement of how tightly the pistons squeeze the mixture of fuel and air before it ignites, and therefore how much power can be generated. The regulations include a test to stop teams exceeding 16:1, but the checks happen at “ambient temperature.”
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