Among those changes, is a 100kg restriction on fuel flow per hour to complete a race distance and a much greater emphasis on the kinetic energy recovery system (KERS).
In recent seasons, KERS provided a 60kW boost for around six seconds but for the 2014 season, the system will provide a 120kW boost for 30 seconds.
Scuderia Ferrari's Head of Engines, Luca Marmorini, said all aspects of the new engine’s design have provided challenges to the engineering team.
"There is no one single aspect of the new project that is more critical than the next," Mr Marmorini said.
”I'd say it's difficult in all 360 degrees. For example, the turbo is a new type which runs to 25,000 rpm and is definitely something absolutely new. Also the very complex electronics and management systems are a very big step forward, which means that engine management will be a very difficult challenge."
Long-time sponsor, Shell, has played its part in overcoming some of the engineering challenges, developing a new lubricant and a unique blend of fuel, both for specific use by the Ferrari F1 team.
Ferrari has expressed concern over the fuel restrictions, claiming drivers may be forced into an ‘economy race’; saving fuel to reach the finish line, rather than racing each other flat-out.
For 2014, F1 engines will all be 1.6 litre V6 units and turbocharged for the first time since the 1988 season.