Which type of fuel injector is commonly used in modern gasoline engines?

The most commonly used type of fuel injector in modern gasoline engines is the direct injector. Direct fuel injection systems inject fuel directly into the combustion chamber of each cylinder rather than mixing the fuel with air in a separate chamber, as seen in older carbureted systems. This direct injection allows for more precise control over the fuel-air mixture and timing, leading to improved fuel efficiency, better power output, and lower emissions.

The advancement in technology with direct injection enables manufacturers to design engines that can achieve higher compression ratios and more efficient combustion processes. This is crucial in meeting stringent emissions regulations. Additionally, direct injection can enhance the performance of turbocharged engines by providing better atomization of fuel, which is essential for effective combustion under high loads.

In contrast, mechanical injectors and pneumatic injectors are less common today, as they do not offer the same level of performance or efficiency. Carbureted injectors have largely been phased out in favor of fuel injection systems due to their better fuel management capabilities. Overall, the widespread adoption of direct injection has significantly influenced modern engine design and performance standards.