What type of bearings are master rod bearings generally?

Master rod bearings in reciprocating engines are typically plain bearings. This type of bearing features a simple design with a smooth surface that allows for rotation and sliding motion between the bearing and the crankshaft journal. Plain bearings are well-suited for master rod applications due to their ability to handle the large loads and steady wear conditions typically found in these components.

The plain bearing design minimizes friction and provides effective support, which is critical for the operation of the master rod as it transmits forces within the engine. This type of bearing is also easier to manufacture and install compared to roller or ball bearings, which require more complex designs and arrangements. The operational simplicity and reliability of plain bearings make them the preferred choice for master rod bearings in most reciprocating engines.