So I just received the dreaded low compression results, and I'm most likely going the rebuild route. I am posting mostly out of curiosity, and am wondering if anyone has any insight about the specific mode of failure of my engine, just from the compression scores. I realize I will find out once it is torn down, but I'd be interested if anyone can predict what went wrong without looking at the internals. Perhaps pointless, but hey I'm curious. Here are the scores:
kgf/cm2 Rotor 1 Rotor 2
1 4.7 7.7
2 5.8 7.8
3 7.7 8.6
RPM 289 298
The massive difference in the faces of Rotor 1 seem to me to point towards an apex seal problem. What's interesting though is that the engine was rebuilt with new apex seals only about 15000 miles ago. That should also mean that excessive carbon buildup is unlikely, right? Just spitballing here.
Any ideas?
04 MT about 116000 miles, 15000 on engine
kgf/cm2 Rotor 1 Rotor 2
1 4.7 7.7
2 5.8 7.8
3 7.7 8.6
RPM 289 298
The massive difference in the faces of Rotor 1 seem to me to point towards an apex seal problem. What's interesting though is that the engine was rebuilt with new apex seals only about 15000 miles ago. That should also mean that excessive carbon buildup is unlikely, right? Just spitballing here.
Any ideas?
04 MT about 116000 miles, 15000 on engine
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