Quote:
Originally posted by mpdevelopment
Those bearings are showing signs of spalling. This is due to mechanical overload. At the rpm you are turning the loading on the rod cap bearing due to inertia is too great for the bearing material. If you had a chevy size journal you could get a bearing with a harder overlay that would handle the loads. Check out Federal Moguls site for info on engine bearings. If you can't get better bearings you could try lighter pistons and or titanium rods to reduce the loads, but 25hrs use at 8000+ rpm is a long time and that may be the limit anyway.
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I would have to agree. It does seem inertia related.
Not certain how this could relate to a bearing surface, but we discovered an anomaly with an early gearbox design of ours five years ago. I wont bore anyone with the details. PM sent to snowman.
In a nut shell, is the oil being ignited by way of Diesel effect? Small focussed combustion?