The idea that Formula 1 racing circuits will switch to IndyCar racing if the current engines are not retained is obviously an idle threat, when one considers the IndyCar rules. They are as follows: “turbocharged engines (to allow for flexibility in power) with up to six cylinders and 2.4 liters of displacement, tuned to produce between 550 and 750 horsepower to suit the diverse set of racetracks on the IZOD IndyCar Series schedule”.
A clever pal of mine has pointed out that 2.4-litre turbo inline-4s or V6s, producing 550-750hp, will be of a larger capacity than their 1.6-litre F1 equivalents and so will either rev less or be blown less hard than the F1 equivalents if they are producing the same levels of horsepower. Either way they will probably make less quantity and less quality noise as a result.
So why would the fans choose to listen to them any more than they would listen to the F1 engines of tomorrow?