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.
To check the dwell angle without a dwell angle meter, you can use a multimeter set to measure resistance. Connect the multimeter leads to the ignition coil's positive terminal and the negative terminal while cranking the engine. Monitor the voltage drop as the points open and close; this can give you a rough idea of the dwell angle, as it affects the time the points are closed. Alternatively, you can use a timing light to observe the ignition timing, which indirectly reflects the dwell angle.
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.
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.
30 degrees Dwell angle varies from vehicle to vehicle. The dwell angle is the amount of degrees the points are closed
To set the dwell on a 1968 Chevrolet 327 engine, you'll need a dwell meter. First, connect the dwell meter leads to the ignition coil's negative terminal and ground. Start the engine and let it warm up, then check the dwell reading. Adjust the points gap using a feeler gauge to achieve the desired dwell angle, typically around 30-32 degrees for the 327, by loosening the points screw and repositioning the points as needed.
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.
To set the dwell on a 1987 Suzuki Samurai, you'll need to access the ignition system. Use a dwell meter connected to the negative terminal of the coil and the ground. Start the engine and let it warm up, then adjust the points (if equipped) to achieve the recommended dwell angle, typically around 30 degrees. After adjustments, recheck the dwell to ensure it's within specifications.
12-16 thou gap and 34-36degree dwell angle for HR.
.020 If you have a dwell meter it is 30 degrees of dwell.