Direct Gasoline Injection for MotorcyclesThe fuel injection in motorcycles has a big influence on the behaviour of the engine in terms of performance, emission, fuel economy and driveability.
During the last years Direct Gasoline Injection (DGI) has been developed to readiness for start of production and has been introduced to several passenger cars. The major aim when talking about DGI for passenger cars is the improvement of fuel consumption.
However motorcycles have to fulfil different target specifications which are comparable to application of DGI for racing.
The potential for performance increase by using DGI is shown in picture 'Potential for performance increase by using DGI'. Beside a slightly increase in engine power DGI offers additional potential to improve the engine behaviour.
Improvements by using DGI: | higher engine performance due to increased volumetric efficiency | | improved driveability | | possibility of fast traction control | | improved emission behaviour by avoidance of wall film (picture 'Wall film of engine with PFI') and reduced HC emissionsduring valve overlap (picture 'HC emissions during valve overlap') | | improved fuel economy, extended range |
A special challenge when applying DGI on motorcycle engines is the wide engine speed range of these engines.
The following pages describe the characteristics to be taken into consideration when applying DGI on high performance and high revving motorcycle engines.
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