24-11-2018, 10:51 PM
(24-11-2018, 10:47 PM)Bob Culver Wrote: Long ago when my car was in hard everyday use, and I was very inexperienced, I had the rods remetalled. I had noticed that the babbit was more scored on the trailing side of the trench. And I had seen all the diagrams in books showing the very destructive effects on oil film of grooves etc. So I installed with no holes. (Unfortunately filling the holes with screws) The car has been held at 4.000 rpm for long stretches and 50 mph ditto and after about 20,000 miles the big ends appear unmarked. However many maintain the holes are vital, and presumably Austin had a reason. Whether oil net entered or exited is uncertain, but I suspect act as air reliefs to facilitate oil flow. But I am not sure that the trench is necessary or desirable, or whether all models had originally.These are shell bearings in Phoenix rods, no trench
(All illustrated in Ruairidh’s recent photos under Ring a Ding...)