English.chinabuses.com: As in Western countries, China's newer internal combustion engines have become technology-intensive products that integrate with electronic controls and catalytic technology.

For China's diesel engines, techniques such as common rail, electronic unit-pump, multi-valve, exhaust gas recirculation and variable geometry turbochargers have been widely used.

For the country's gasoline engines, Western engine technologies have been adopted such as multi-valve, dual overhead camshafts, charger intercoolers, variable geometry induction and dual-spark plug ignition. Engines with variable valve timing have been popular models. Domestic companies with self-designed and owned gasoline engines have developed some modern techniques as well, including turbo charging and variable valve timing.