The engine spec (and therefore cylinder count) has changed several times in the past, but as of the 2014 the sport has switched from 2.4-litre normally-aspirated V8 engines to 1.6-litre V6 turbo engines
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The 2013 season featured vehicles with 8 cylinders, and close to 800 horsepower, with a redline close to 20k rpm, as of the 2014 season the cars have 1.6-litre V6 turbo engines with around 600 horsepower at 15,000 rpm
They have 10 cylinders and cannot exceed 3 Liters of displacement.
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since 2006 they have reduced to 2.4 litre V8s