What is the average piston speed of a five cylinder low- speed engine with a bore of 29.5 inches (75 cm), a stroke of 63 inches (160 cm), and a rated speed of 123 RPM?
β’ Average piston speed formula in a reciprocating engine β’ Relationship between stroke length, RPM, and piston travel per minute β’ Consistent unit conversion between inches and feet (or cm and m)
β’ First, express how far the piston travels in one revolution based on the stroke. Is it one stroke or up-and-down (two strokes) per revolution? β’ Then, figure out how many of those piston travels happen per minute at 123 RPM. β’ After calculating in inches per minute, convert carefully to feet per minute (or to meters per minute) and compare with the choices.
β’ Be sure you are using stroke length, not bore, in the piston speed calculation. β’ Confirm whether to multiply stroke by 1 or 2 when finding distance per revolution for average piston speed. β’ Double-check your unit conversions: 12 in = 1 ft and 100 cm = 1 m.
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