With two years of strong competition between Chevy and Honda under IndyCar's 2.2-liter turbocharged engine formula, planned upgrades for the 2014 season have given both manufacturers some leeway to make more horsepower and torque.
The 2.2-liter displacement remains unchanged, but many items have either been opened for re-homologation or redefined.
Changed from the original set of engine rules produced in 2011, manufacturers are now required to build V6 engines, which is altered from the previous language that simply restricted the number of cylinders to six. The option to use single- or twin-turbo systems has also been revised, deleting the single solution altogether.
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