Journal of Mechanical Science and Technology

, Volume 34, Issue 1, pp 477–488 | Cite as

Effective release energy, residual gas, and engine emission characteristics of a V-twin engine with various exhaust valve closing timings

  • Nguyen Xuan Khoa
  • Ock Teack LimEmail author
Original Article


This article presents a study for determining the effective release energy, residual gas, and peak firing pressure rise of a V-twin engine with various exhaust valve timings. The effect of exhaust valve closing timing (EVCT) on effective release energy, peak firing pressure rise, residual gas, engine performance, and engine emission are completely discussed for the first time. Results show that EVCT had a significant effect on residual gas, peak firing pressure rise, and effective release energy. When the EVCT increased from 10 deg to 90 deg ATDC, the residual gas ratio increased from 0.2 % to 1.7 %. The peak firing pressure rise and effective release energy increased until reaching maximum values of 4.59 bar/deg and 0.64 kJ, respectively, and decreased as the EVCT continued to increase. The engine performed at its optimal efficiency when the EVCT was at 50 deg ATDC. The maximum brake mean effective pressure was 7.74 bar, the minimum brake specific fuel consumption was 399.35 g/kWh, and the maximum engine brake torque was 16.92 Nm. The minimum NOx emission was 7.54 g/kWh at a 30 deg ATDC of EVCT.


Residual gas Effective release energy Peak firing pressure rise EVCT Emission characteristics 


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This research was financially supported by the Centre for Environmentally Friendly Vehicle as the Global Top Project of KMOE (2016002070009, Development of Engine System and Adapting Vehicle for Model 110cc and 300cc Correspond to EURO-5 Emission). This research was supported by The Leading Human Resource Training Program of Regional Neoindustry through the National Research Foundation of Korea funded by The Ministry of Science, ICT and Future Planning (2016H1D5A1908826).


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Copyright information

© The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2020

Authors and Affiliations

  1. 1.Graduate School of Mechanical EngineeringUniversity of UlsanUlsanKorea
  2. 2.Faculty of Automobile TechnologyHanoi University of IndustryHanoiViet Nam

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