The 2006 Formula One season saw the Fédération Internationale de l'Automobile (FIA) introduce a then-new engine formula, which mandated cars to be powered by 2.4-litre naturally aspirated engines in the V8 engine configuration, with no more than four valves per cylinder. Further technical restrictions, such as a ban on variable intake trumpets, have also been introduced with the new 2.4 L V8 formula to prevent the teams from achieving higher RPM and horsepower too quickly. The season limited engines to 18,000 rpm in order to improve engine reliability and cut costs.