mk e wrote:
Yeah, sorry.....
Yeah right.
//
Before skimming the lower crank case, my clearances were looking like:
0.0037
0.0036
0.0039
0.0036
0.0038
Now they're looking like:
0.0026
0.0028
0.0033
0.0033
0.0033
While 3, 4 & 5 being the same looks good, the main bearing bores are:
2.8524
2.8529
2.8535
2.8536
2.8538
There's probably nothing to make of the fact that the #5 main bore is 0.0003 larger than the #3, while the bearing clearance is the same.
All of these measurements are based on the average of four tripod bore mic measurements, so I don't actually get the pure diametral measurement from the middle of the top shell to the middle of the bottom shell which is supposed to define "bearing clearance".
Yes, the bores did end up tapered. The prototype machinist took slightly more off the front of the casting than off the rear. Oops.
So they were on the high side but runable before, now they're smaller without being too small. That's about all I could hope for from that operation.
It's not as perfect as I would have liked, but it's better.
I guess if I got really obsessive I could order another set of bearings and have Line-2-Line coat them heavier, then pull from that set to create select-fit bearing shells to bring 3, 4 & 5 down just a touch.
Now... on to ProMar!
//
Top rings are at Total Seal getting lateral gas ports cut into them.