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Among those engines, the OPOC and the Freevalve were the ones that could be regarded somewhat promising. But anyway, while the Freevalve would still lead to some skepticism in regard to how its compressed air supply would increase the load compared to a regular valvetrain, the OPOC design still seems to meet the requirements of Class 4 and Class 5 trucks in developing markets such as most of Southeast Asia, Latin America and China.
OTOH that ball-shaped genset would be an interesting option for stationary applications.
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