a little engine build update this time, my original plan for the new bottom end was to send my spare set of 16ve pistons off for machining, as by taking 0.6mm off the whole piston crown would take the static compression ratio down from about 13.97:1 to about 13:1, but just a few days before i was away to send them off a set of cp 12.5:1 ve pistons came up for sale, and for about the same cost as the machining too, so the decision was kinda a no brainer and i bought them, i had to order a set of cp rings for these as the stock ve rings aren't fully compatable with the cp's but they should be here any day now as they were sent out last friday from gspec. the cp's arrived a little while ago but i just got round to cleaning them up this evening so i thought i'd post some pics. anyway these cp's were originally craigs and were in his high comp ve that was in his n14, and dale bought them from craig but he never got round to fitting them to an engine before selling them on to me. with that in mind i'm hoping craig will chime in as to how the pictured damage occurred to them as it's on every single piston, so i'm wondering if there was combustion chamber contact? or something else i need to look out for? or is this just det damage? anyway here's a pic of the general condition they were in as they arrived,
so i set about them with a plastic brush and wd40 and got them back to looking like this
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as i said i'm only interested in the source of the damage as a heads up so i can avoid any farther problems, imo the damage so far isn't terminal, as i'll just take off any sharp edges with a hand file just to make sure there aren't any hotspots to cause det. i also received some multi layer, reinforced silicone pipe to replace the join between the block and the thermostat housing piping that's under the inlet manifold, one for me and one for nistro
more to come as and when it happens
