| 摘要 |
In a preferred embodiment, a combustion monitor for an engine, including a sealed plug for each engine cylinder retaining a quartz viewing window and adapted to receive a fiber optic light transmitting element. Fiber optic elements extend from the sealed plugs of each cylinder to a remotely located viewing panel where they are spacedly arranged in an easily observed position such that the engine operator may observe and compare the intensity and color of light caused by combustion in the various engine cylinders and thereby judge their operating condition. Alternative arrangements for the sealed plug include one version in which cyclic passage of the piston ring over the viewing window surface maintains it free from engine deposits.
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