The Clue
Tach readings (4 letter answer)
The Answer
RPMS
Tags
Notes
The answer RPMS is seen occasionally, appearing about once every 600 puzzles.
Related Clues
CD rate?
Disk speeds
Engine stats
Stats for DVDs
Tachometer rdgs.
33 1/3 and others
45 and 78, e.g.
Dashboard readings, for short
Engine measures: Abbr.
Measures of interest to a deejay
Mechanics' concerns: Abbr.
Record speeds, for short
Rotation speeds: Abbr.
Tach readings, for short
Turntable rates, for short
What tachometers rec.
33 1/3 and 45, for short
Auto performance factor, informally
Letters denoting motor speed
High ones may produce a roar
Definition
RPM as a noun:
1. (revolutions per minute, rpm, rev) = rate of revolution of a motor; "the engine was doing 6000 revs"