The Effect of Low Lead Gasolines and Some Aftermarket Lead Substitutes on Exhaust valve Seat Wear

1987 ◽  
Author(s):  
Michael C. Croudace ◽  
Tim Wusz
Keyword(s):  
Exhaust Valve ◽  
Valve Seat

Exhaust Valve Seat Leakage

1997 ◽  
Author(s):  
John Hoard ◽  
Peter Moilanen
Keyword(s):  
Exhaust Valve ◽  
Valve Seat

Diesel Engine Performance Improvement for Constant Speed Application Using CFD

2017 ◽  
Author(s):  
Balasaheb S. Dahifale ◽  
Anand S. Patil
Keyword(s):  
Combustion Chamber ◽  
Fuel Consumption ◽  
Performance Improvement ◽  
Test Data ◽  
Engine Performance ◽  
Exhaust Valve ◽  
Fine Tuning ◽  
Intake Valve ◽  
Valve Seat ◽  
Load Conditions

The detailed investigation of flow behavior inside the combustion chamber and performance of engine is most challenging problem due to constraints in Experimental Data collection during testing; However, Experimental testing is essential for establishment of correlation with CFD Predictions. Hence, the baseline engine was tested at different load conditions and validated with CFD results, before it was optimized for performance improvement. The objective of the CFD Prediction was not only to optimize performance (Fuel Efficiency, Power, Torque, etc.) & Emissions Reduction, but also to assess feasibility of Performance Upgrade Potential. In the present CFD study, surface mesh and domain was prepared for the flame face, intake valve, intake valve seat, exhaust valve, exhaust valve seat and liner for closed volume cycle, between IVC and EVO using CFD code VECTIS. Finally simulations for three different load conditions were conducted using VECTIS solver. Initially, in-cylinder pressure vis a vis crank angle prediction was carried out for 100%, 75% and 50% load conditions. Then the fine tuning of (P-ϴ) diagram for different load conditions was conducted by varying different combustion parameters. Further, the engine performance validation was carried out for rated and part load conditions in terms of, IMEP, BMEP, break specific fuel consumption and power output, while NOx mass fractions were used to convert the NOx to g/kWh for comparison of emission levels with the test data. Finally optimized re-entrant combustion chamber and modified valve timing with optimum fuel injection system simulation was carried out to achieve target performance with reduced fuel consumption. A 3D CFD result showed reduction in BSFC and was in close agreement with the test data.

The Research on Thermal-Mechanical Coupled Analysis and the Lightweight Design of Engine Exhaust Valve

2015 ◽  
Vol 729 ◽  
pp. 143-148
Author(s):  
Zhi Yong Deng ◽  
Feng Chong Lan ◽  
Wei Huang ◽  
Hui Guo ◽  
Pei Huan Chen
Keyword(s):  
Stress Distribution ◽  
Wall Thickness ◽  
Contact Surface ◽  
Lightweight Design ◽  
Exhaust Valve ◽  
Coupled Analysis ◽  
Valve Seat ◽  
Engine Exhaust ◽  
Valve Disc ◽  
Exhaust Valves

Four types of exhaust valve models are established, the lightweight on engine exhaust valve is designed. The results on thermal mechanical coupled analysis of four exhaust valve models show that: The maximum values of mises stress appear in contact surface between the valve cone and valve seat; Comparing the maximum mises stress, as wall thickness of the hollow valve increases, there are gradual decrease trends in the same positions of the valve cone, the locking groove, neck and end face of the valve disc. The research on the stress distribution of exhaust valves and the variation law between hollow valves′s strength and their wall thickness provide a good reference for improvement in the future.

Development of Exhaust Valve Seat Insert Material of the Eco-friendly Engine

2003 ◽  
Vol 2003.11 (0) ◽  
pp. 241-242
Author(s):  
Teruo TAKAHASHI ◽  
Arata KAKIUCHI ◽  
Kenichi SATO
Keyword(s):  
Exhaust Valve ◽  
Valve Seat ◽  
Seat Insert

Analysis of the tribological behaviour of an automotive engine exhaust valve and a valve seat using a newly developed high temperature workbench

2015 ◽  
Vol 37 (6) ◽  
pp. 1743-1749
Author(s):  
Luis Alberto Breda Mascarenhas ◽  
Jefferson de O. Gomes ◽  
Celso Barbosa ◽  
Tarso Barreto Nogueira ◽  
Andrey Teixeira Portela
Keyword(s):  
High Temperature ◽  
Exhaust Valve ◽  
Tribological Behaviour ◽  
Valve Seat ◽  
Engine Exhaust ◽  
Automotive Engine
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