That makes a lot of sense
It's a ray of hope, thinking about it.
1) It's not unheard of for Teilo's looms to be wrong. I recall someone else having one with a wiring error of some description.
2) extreme bore wash might explain why the compression got worse when we retested it after testing with the aux. belt removed. FOD would probably have resulted in a one-off knackering of the valves rather than progressive.
3) The plug from that pot did seem quite wet (although they all were, it having been fired up for only a couple of seconds from cold).
4) There was no evidence of damage on the plug or the piston crown consistent with something getting battered around in there.
Would that cause the noise, as I think it would be really coincidental for the injector to cause the compression, and the metallic noise to be an unrelated issue? I guess borewash means lack of lubrication in that pot though?
Noise did sound ominous, but I guess if the oil film between piston and bore had been taken out, the piston would be rattling around in the bore.
Not sure I'll be up for reassembling it and running it tonight. An early night seems a better option at the moment, but I can at least buzz out the LPG loom pretty easily and check that the injector signal is correctly looped through.
Kevin