High back pressure of exhaust manifold, rapid change in load, scavenge fire and so on.
高背压的排气系统，在负载快速变化，清除火灾等。
2
In this paper, the principles of operation, limiting characteristic and adjustment of PGA Governor Scavenge air pressure fuel limiter are introduced.
此文介绍了PGA调速器扫气压力燃油限制器的工作原理，特性及调整方法。
3
C. Blow-back through the scavenge air ports, owing to an incorrectly adjusted exhaust cam disc or large resistance in the exhaust system(back pressure not exceed 300 mm wc)