Research Article
[Retracted] Influence of Sulfur and Additives on Wear of Exhaust Valve Seat of Cylinder Head
Table 6
Inspection results of exhaust valve.
| Items | Contact surface | Noncontact surface | Run time |
| 0# | Black discontinuous deposit, valve disc is not worn, corresponding valve seat wear | Blue | 20 hours | 0#+ | Dark black continuous deposits, valve disc is not worn, valve seat is not worn | Dark brown | 20 hours | ā10# | Dark black continuous deposits, valve disc is not worn, valve seat is not worn | Black carbon deposit | 20 hours | ā10#+ | Dark black continuous deposits, valve disc is not worn, valve seat is not worn | Dark brown | 20 hours |
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