mk e wrote:
No, no, spray graphite is the plan this go round.
I don't want to sound like a broken record on this, but I would be really surprised if that works. When I had dry film lubricant coatings applied to my pistons, I was explicitly told that the bore clearance should be set before coating, and that the DFL coating was semi-sacrificial - that it would wear off the piston and embed in the bore in normal use. To me, that doesn't sound like something that has the dimensional stability you'd want for this application.
I don't know if what I was told is correct, but it's enough to make me nervous about this approach.
FWIW,
I also found this:
Quote:
When applied to piston skirts, a dry film lubricant can allow closer piston-to-bore clearances for reduced piston slap and blowby. The added thickness of some coatings can actually restore worn piston skirts back to original tolerances while cushioning the motions of the piston in the bore.
Which suggests that your approach should be OK - as long as it's the right kind of coating. Did you get any feedback from the manufacturer?
Maybe I'm worrying about nothing, but I'd feel bad if I didn't share this concern.
Best of luck to you - I'm always amazed at how fast you get that engine apart and back together, but for your sake I hope that skill becomes obsolete very soon!