4 Problems With Direct Injection Engines

The single biggest technology change to gasoline combustion engines over the past 50 years is arguably direct fuel injection, and unfortunately, it brought with it problems. In 1975, over 95% of gasoline engines sold in America were carbureted. By the year 2000, nearly 100% of gas engines (99.8%) had made the switch to port injection. And by the year 2025, over 80% of gas engines are now using direct injection, thanks to the power and efficiency benefits. Most people are aware of the carbon deposit challenge that GDI engines face, since port-injectors no longer clean the intake valves. But there are three other challenges: soot formation, which in turn can cause wear on timing chains, fuel dilution, from DI engines directly spraying cylinder walls – especially for shorter trips, and LSPI, destructive behavior that stems from small, turbocharged engines making more power at low RPM, in part thanks to GDI. So while the industry initially seemed to be abandoning port-injection, it’s made a comeback, in combination with direct-injection.

Full Video (DI Problems) – https://youtu.be/uVd-ZS5bnyY

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