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Research on Extended Expansion General-Purpose Engine (Part 2) – Heat Release and Brake Performance –

Article of Honda R&D Technical Review Vol.19 No.1


The combustion and efficiency of an extended expansion general-purpose engine employing a multiple linkage system was compared to that of a conventional engine consisting of the same component parts with the exception of the linkage system.
The results show that this extended expansion increases indicated thermal efficiency from 29.6% to 33.2%. In addition, as the piston speed near the compression top dead center of this engine is slow, mass fraction burned depends upon the change in the cylinder volume with respect to the capacity of the combustion chamber during the combustion period. The change of the minimum spark advance for best torque (MBT) timing relative to load is smaller than that of the conventional engine. Brake thermal efficiency of the test engine was increased by approximately 13%, from 20.1% for the conventional engine to 22.7%, under the EPA mode with fixed ignition timing operation.


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Author (organization or company)

Hibiki KOGA(Power Products R&D Center)、Sei WATANABE(Power Products R&D Center)

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