GDI Engine – Direct Injection
Direct injection guarantees improved engine performance because of the cooling effect of the injected fuel inside the cylinder and the fact that the fuel is injected directly into the chamber rather than passing through the intake valves.
The high injection pressure (200 bar compared to current systems with160 bar) guarantees correct pulverisation of the petrol as well as optimum mixing and combustion at up to 8000 rpm. This in turn boosts performance and reduces fuel consumption whilst ensuring that current emission limits are respected.
Direct fuel injection also delivers a compression ratio of 12.2:1. This is higher than that of Ferrari engines with indirect fuel injection. Once again the result is improved performance and reduced fuel consumption.
Like other Ferrari engines, this one also boasts variable timing on both inlet and exhaust cams to optimise performance and reduce fuel consumption right across the entire rev range.
Its inlet and exhaust tracts were designed to deliver a high efflux coefficient and a high turbulence index. This guarantees a good mix and efficient combustion without impinging on performance.
The exhaust system consists of two metal matrix catalysers (one per cylinder bank), one central pre-silencer and two rear silencers. The aim was to reduce back pressure whilst still respecting current noise limits. There are by-pass valves on the rear silencers and these are electro-hydraulically commanded by the engine control unit.
The adoption of a secondary air system in the cylinder heads means that only one catalyser per bank is necessary which keeps back-pressure down yet ensures compliance with the very strict Euro5 and LEV2 emissions standards.