Originally Posted by
Sport_Pilot
Repeatablility is much broader than just tolerance. Put it another way as to the accuracy only, they could machine to the same tolerances and easily make parts meeting the same tolerances. But they would have more rejected parts due to repeatablility.
The rejected parts usually become spare parts. I think about this fact when looking at a new engine. I look at piston, liner, and crankshaft costs. If the piston and liner set costs almost as much as a new engine, why buy one in the first place considering the market glut of good engines?
Speedracer is right about the serious competitor buying a bunch of engines and hand fitting the parts to get one or two good ones.