After months of negotiations, Formula 1 bosses finally reached an agreement on the cost, supply, performance convergence and noise of engines from 2017 until '20 last month.
The FIA could ask F1's Strategy Group for a rethink of the sport's engine rules if the gap in performance between manufacturers does not close up sufficiently by the start of 2017.
Red Bull boss Christian Horner believes the new 2017 Formula 1 engine regulations are "underwhelming" and "very weak".
Red Bull Chief Criticizes New F1 Deal on Engines
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Christian Horner says F1 has not gone far enough in any of the four areas addressed in the "soft" engine rules agreement for 2017.
Mercedes has confirmed to the FIA it will continue to supply its current three Formula 1 customers with power units in 2017, Autosport can reveal.
The FIA has revealed details of a 'sound generator' which is in the pipeline to crank up the noise produced by F1's hybrid engines.
Four major manufacturers welcomed guarantee of stable rules, and highlighted efforts to reduce costs and performance gaps.