It was a tool used to accurately set the gap on ignition points. They don't get much use these days.
The meter needs a dwell setting or scale. Otherwise it won't measure it with meaningful readings.
With a dwell meter you could monitor the dwell angle. If the dwell fluctuates the distributor shaft and bushings are probably worn out. The dwell should be between 28 and 32 degrees and not fluctuate.
30 degrees Dwell angle varies from vehicle to vehicle. The dwell angle is the amount of degrees the points are closed
A dwell meter measures the duration that the ignition points in a gasoline engine remain closed during each cycle, which is crucial for proper timing and efficiency. It connects to the ignition system and displays the dwell angle, typically expressed in degrees. As the engine runs, the meter indicates how long the points are closed, helping to diagnose issues with ignition timing and ensure optimal engine performance. Adjustments can be made based on the reading to achieve the correct dwell angle specified by the manufacturer.
50 degrees of dwell. You can't do the final point setting procedure with feeler gauges, because every set of points and condenser is a little different. How to set them: First set the points to .016" gap. Next, hook up your dwell meter and start the engine. With the meter set to the 4-cylinder position, see if you have 50 degrees of dwell angle on the meter. If you have more, close the points .001" and try it again. If you have less, open them up .001" and recheck. Keep doing it until the dwell angle is 50 degrees.
Yes, but the dwell meter is by far the best and easiest way on a Chevy.
Setting dwell angel and setting point gap accomplish the same thing. On my 64-1/2 Mustang I have to remove the distributor cap and loosen the set screw on the points. Place a screw driver in the slot for adjusting and twist until the gap between the points is correct. The cam on your distributor shaft must be aligned with the nub on the points. This achieves the Maximum Gap your points can achieve. It also determines your maximum Dwell angle (Angle is nub- points pivot - points tip). Tighten set screw when gap is correct and check for accuracy. Withthe car running and a dwell meter connected you can confirm proper dwell angle. Some cars have an adjusting screw external to the distributor cap so you can adjust using a dwell meter while the car is running.
12-16 thou gap and 34-36degree dwell angle for HR.
.020 If you have a dwell meter it is 30 degrees of dwell.
no.
Use a dwell meter to set the points at 30 degrees dwell.
attach a dwell meter and set the points for 30 degrees.