Does electronic ignition use vacuum advance?
Does electronic ignition use vacuum advance?
Check to see if vacuum increases dramatically when you rev the motor well past idle. And no, your electronic ignition does not eliminate the crucial need for vacuum distributor advance.
How do you adjust the advance of a vacuum?
There is a small adjusting screw in the vacuum advance. Turn the screw clockwise to decrease the vacuum advance and counterclockwise to increase the advance. Repeat steps 8 and 9 until the total difference between the mechanical advance and vacuum advance readings is approximately 10 degrees apart.
Why do you need a distributor with vacuum advance?
So based on this, you can see that having a curve in the distributor along with vacuum advance is a good thing as it reduces low-speed timing where the engine might detonate with too much timing but it can also benefit from more timing at part throttle than what is required at wide open throttle.
How do you change the timing on a vacuum pump?
Disconnect the vacuum pump and insert a 3/32 Allen wrench into the port on the vacuum advance where the hose connects. There is a small adjusting screw in the vacuum advance. Turn the screw clockwise to decrease the vacuum advance and counterclockwise to increase the advance.
How to test the vacuum advance in classic cars?
Once the base timing is set to the correct position, you can connect a hand-operated vacuum pump to the diaphragm, give it a few pumps, and then watch the timing mark on the crankshaft harmonic balancer advance on the timing scale with the timing light. The second way to test the vacuum advance does not require a pickup timing light.
There is a small adjusting screw in the vacuum advance. Turn the screw clockwise to decrease the vacuum advance and counterclockwise to increase the advance. Repeat steps 8 and 9 until the total difference between the mechanical advance and vacuum advance readings is approximately 10 degrees apart.
Disconnect the vacuum pump and insert a 3/32 Allen wrench into the port on the vacuum advance where the hose connects. There is a small adjusting screw in the vacuum advance. Turn the screw clockwise to decrease the vacuum advance and counterclockwise to increase the advance.
So based on this, you can see that having a curve in the distributor along with vacuum advance is a good thing as it reduces low-speed timing where the engine might detonate with too much timing but it can also benefit from more timing at part throttle than what is required at wide open throttle.
How does the Allen adjustment work on a vacuum canister?
The allen adjustment adjusts the diagram spring tension working against the vacuum applied. The vacuum cans do have a fixed total advance limit as well. The allen adjustment is used to adjust total vacuum advance relative the vacuum level applied, too tight can effectively block any advance on low vacuum levels.
