18 February 2016

Advantages and disadvantages of GDI Engine

In GDI fuel injection system is direct sprays gasoline into the combustion chamber. GDI is an advanced injection system for gasoline engines that thanks to high operating pressures and multi-point injection combined with turbocharger allow engine downsizing. GDI improved performances, and significant reductions in fuel consumption and emissions. Let us have a deep insight into the pros and cons of the GDI engine in this article. 

Advantages of Gasoline Direct Injection engine :

  • Produce more power using less fuel. 
  • Tolerate extremely lean fuel mixtures (40:1) under a light load. 
  • 15 to 20 % better fuel economy compared to MPFI systems.
  • GDI engines can handle higher static compression ratios.
  • Improve combustion efficiency and power. 
  • GDI engines produce more horsepower than MPFI systems.

Disadvantages of Gasoline Direct Injection engine :

  • In the gasoline direct injection engine fuel is directly injected in the combustion chamber layer of carbon deposits on the intake valve. As the deposits build up on the valve face, they may prevent the intake valves from sealing causing a compression leak, loss of power. 
  • Heavy carbon accumulations on the intake valves can also restrict airflow, hurt power at higher engine speeds and cause a drop in fuel economy and performance. 
  • If the engine is equipped with a turbocharger, there is a chance the carbon could damage the turbine fins in the turbocharger. 
  • Because of diesel injection, the fuel has less time to mix with the incoming air before it ignites.