On this last CI, my compressions have dropped to 65/70/65/72 on my 320 (850 hours). Last year they were all around 72. All the air is coming out past the rings and have a suspicion that the rings lands may have excessive carbon build up and sticking a bit. I am considering pull the jugs to hone an re-ring, but I hate getting all the baffling off and back on. I know in the auto world many have had success un-sticking rings with ATF, Seafoam, etc. However, they have vertical cylinders where gravity will take the liquid to the ring area.
Has anyone ever had success using methods like these to unstick rings?
Larry
Has anyone ever had success using methods like these to unstick rings?
Larry