I used to think it was the number of times per minute that the prop shaft rotates, but then i thought it could be the number of revolutions of the gear engaged; my dad tells me it is the number of times the distributor high tension fires. so what does the rev counter measure????
2007-04-07 12:27:52 · 14 answers · asked by bmw 3 1 in Cars & Transportation ➔ Other - Cars & Transportation
The revoloutions of the engine
2007-04-07 12:31:40 · answer #1 · answered by Stu pid 5 · 4⤊ 0⤋
Engine rotational speed in rpm (revolutions per minute). Not connected with the gears or transmission, hence the rev counter operating whenever the engine's running, in gear or out of it.
In the "good old days" rev counters were operated mechanically, often off the camshaft, but nowadays they are electronic and get their signal usually from a source within the ignition system. So dad's got the idea!
2007-04-07 20:49:44 · answer #2 · answered by champer 7 · 0⤊ 1⤋
It measures the number of times the engine's crankshaft rotates per minute.
2007-04-10 00:31:34 · answer #3 · answered by Neil 7 · 0⤊ 0⤋
It measures the engine crankshaft revolutions. But the pickoff for the sensor can well be part of the distributor system, which runs at half the crankshaft speed.
2007-04-07 12:50:30 · answer #4 · answered by Anonymous · 4⤊ 0⤋
Engine crankshaft speed in revolutions per minute, before the transmission and regardless of gear position.
If your question is about the mechanics of how the crankshaft speed is measured, I don't know.
2007-04-07 13:10:04 · answer #5 · answered by Anonymous · 2⤊ 0⤋
The "rev" counter or tachometer measures the revolution speed of the crankshaft.
2007-04-07 12:38:01 · answer #6 · answered by psychoticgenius 6 · 4⤊ 0⤋
it measures the number of times the engine is turning per minute
2007-04-09 00:46:42 · answer #7 · answered by boy boy 7 · 0⤊ 0⤋
The number of times the engine crank shaft terns a full circle, i hope this helps .
2007-04-11 11:52:08 · answer #8 · answered by Mick 4 · 0⤊ 0⤋
Crankshaft revolutions.
2007-04-07 23:29:42 · answer #9 · answered by jayktee96 7 · 0⤊ 0⤋
Engine revolutions.
2007-04-07 12:32:14 · answer #10 · answered by Tracker 5 · 3⤊ 0⤋
they show the rate of rotation of the engine's crankshaft by measuring the spark rate of the ignition system,
2007-04-07 12:32:44 · answer #11 · answered by BUNGLE!! 5 · 2⤊ 0⤋