|
When calculating theweight that is to be attached to the crank, the rod bearings and the bigend of the rod are considered rotating weight. The small end of the rod,piston, wristpin, rings, and pin locks are all considered reciprocatingweight (instead of spinning around, it moves up and down).
Typically, 100 percent of the rotating weight and 50 percent of thereciprocating weight are added together to form the total for the bobweight. Some engine builders include four or five grams in the total tosimulate the weight of oil clinging to the various parts. The bobweights are actual weights that are attached to the crank's rod journalsto simulate the weight of the rod/piston assembly.
|