| The worst part of the wear mark is between 1.5"-2.5" from the deck. The skirt is 2.5", so I don't think the skirt did the mark. The light part of the mark starts at 2.5" and travels to the very bottom, so I would say that is caused by the skirt.
The second ring has an undercut bottom side and it is very sharp. I think the piston is rocking slightly and the ring has scraped the cylinder.
I don't have micrometers, but using plastic setup shim material, I could slide a .003" shim in with the piston and the shim could be pulled out, but with a .004", it was very tight. This was at the bottom edge of the skirt.
I tried the plastigage yesterday and it's showing .001" clearance on the rod bearing.
The only measuring device I have is a digital caliper and I have no way to verify the inside and outside measurements against itself.
The rods are 6.2" Eagle forged I-beams. A complete Eagle rolling assembly was installed. |