In a piston engine, a piston rod joins a piston to a connecting rod.
Many internal combustion engines, and in particular all current automobile engines, do not have true piston rods, and the term piston rod is often used as a synonym for connecting rod in the context of these engines.
All engines with crossheads do have true piston rods. These include most steam locomotives and large marine diesel engines.
Famous quotes containing the word rod:
“The tracks of moose, more or less recent, to speak literally, covered every square rod on the sides of the mountain; and these animals are probably more numerous there now than ever before, being driven into this wilderness, from all sides, by the settlements.”
—Henry David Thoreau (1817–1862)
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