Because the slow rate of combustion of natural gas, it's easy to produce the phenomenon of cyclic variations, when taking lean burn technology, the cyclic variations will be increased.
由于天然气的燃烧速率较慢，易产生燃烧循环变动现象，采用稀燃技术时会加剧燃烧循环变动。
2
The intake port and combustion chamber of CA6102 SI engine were improved aiming at its slow burn-rate and big cyclic variability in this paper.