涡流室镶块引燃孔常易被积炭堵塞,有些驾驶员便把这个孔扩大,企图减少堵塞的机会。这样做会造成排气冒黑烟,功率下降。原因是在压缩行程时,空气从 Swirl chamber inserts block ignition holes are often clogged with charcoal, some drivers put this hole to expand in an attempt to reduce the chance of blockage. This will result in exhaust black smoke, power down. The reason is that the air from the compression stroke