Engine technology and fuel efficiency
The ICE has only changed so much. Four-cylinder engines have gone from making 20 horsepower to more than 250—all while being more efficient and cleaner. New engine designs and advanced technologies make this possible.
Check out these engine technologies that not only increase power but also increase efficiency:
Variable Valve Timing and Lift
Most vehicles use valves to let air and fuel into a cylinder and exhaust fumes out. Air is pushed out of the valve using a port. With variable valve timing, fuel efficiency increases because regulated timing cause create operational efficiency at low RPM. VVT might not necessarily save you money on gas but it can definitely increase the amount of a power your car can have.
Everyone associates diesel with loud, smelly and slow. This is a huge misconception from what they are today. Today they are none of those things; they are one of the cleanest types of cars on the road. Diesel technology today provides great fuel economy compared to a typical ICE engine. New diesel catalysts reduce NOx levels and use a particulate trap to contain airborne dust.
Mass produced ICE engines typically use port injection. Port injection is simply fuel injected directly into air-filled cylinders – air and fuel are mixed in the intake manifold. Direct injection, which is popular with diesels and new to gasoline cars, improves fuel efficiency and increases power.
With direct injection, fuel is injected at any particular times to account for time differences with the individual cylinders. Generally, the injectors will wait until the last possible moment and inject small amounts of fuel. This precision creates better fuel economy for the driver and also a cooling effect on the vehicle which provides the driver with more power.