pjc
Well Known Member
Seeking wisdom ...
Three of my 0-320 chrome cylinders have >2000 hrs and look something like the first picture below.
80 hours (and one year ago) I changed out one cylinder for a "repaired" unit (new piston, wristpin, iron rings, valve guides, serviceable valves), also chrome, which now looks like the second photo.
Engine runs fine and all compressions (warm) are in the 70s. The "new" cylinder broke in fine and oil consumption is < 1qt/10 hrs.
Clearly one of these cylinders is not like the others. Is this:
a). A BAD thing. Flakes of chrome are about to come off and eat your cam and most of your crank bearings ?
b). A GOOD thing. This cylinder was artfully re-chromed with this harmless crazing which helps the cylinder wall hold oil ?
c). Nothing ? A demonstration of my poor borescope skills perhaps.
d). Something else ?
Thanks in advance,
Peter
Three of my 0-320 chrome cylinders have >2000 hrs and look something like the first picture below.
80 hours (and one year ago) I changed out one cylinder for a "repaired" unit (new piston, wristpin, iron rings, valve guides, serviceable valves), also chrome, which now looks like the second photo.
Engine runs fine and all compressions (warm) are in the 70s. The "new" cylinder broke in fine and oil consumption is < 1qt/10 hrs.
Clearly one of these cylinders is not like the others. Is this:
a). A BAD thing. Flakes of chrome are about to come off and eat your cam and most of your crank bearings ?
b). A GOOD thing. This cylinder was artfully re-chromed with this harmless crazing which helps the cylinder wall hold oil ?
c). Nothing ? A demonstration of my poor borescope skills perhaps.
d). Something else ?
Thanks in advance,
Peter