How the rise of GDI engines could be good for business BG Products reports on a new opportunity for the independent sector THE Gasoline Direct Injection (GDI) engine is a leap forward in the quest for greater economy and lower emissions, and it seems the technology has been delivering results with OEMs moving over to GDI en masse. The success could see the GDI replace diesel engines in smaller cars as they have high MPG and lower emissions. However, BG Products has said the GDI engine will bring with it maintenance issues and loss of performance. This means there is an opportunity for the independent sector to deliver preventative maintenance and repair.
How Direct Injection works By injecting petrol at high pressure directly into the combustion chamber, DI delivers fuel more precisely and efficiently than port fuel-injection systems (PFI). The result is combustion that is more complete and cooler cylinder temperatures, enabling higher compression ratios for greater efficiency and power. DI can return at least 15 per cent gain in fuel economy while boosting torque by as much as 50 per cent, according to Bosch.
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Combining DI with turbocharging delivers even greater gains in economy and performance, enabling OEMs to use smaller displacement engines for greater efficiency.
Soot issues Soot released from burnt fuel is deposited on the injector tip, interfering with the accuracy and atomisation of the spray pattern. What’s more, the injectors do not spray across the intake valve and the valve is subject to additional deposits as the detergents that are in the fuel do not touch the valve. According to BG Products, GDI engines suffer with a constant struggle between low tension piston rings and high operating pressures, which will eventually erode fuel efficiency and diminish horsepower. Research by BG Products has shown that a preventative maintenance regime to keep injectors free from hard baked deposits will drastically limit problems. For further information about BG Products go to bgprod.co.uk or call 01284 777934.