Anyone ever disassemble a distributor - need help
Here's some timing measurements of a DC/MP vacuum advance distributor on an engine.
Advance in Crank degrees, Engine RPM.
If the engine could have been idled below 900 rpm we would know if the initial timing was 12* or something less.
I suspect it was actually a couple degrees less. This particular engine would have liked 16 - 18* initial.
Anyway you can see in the timing plot how the two springs work.
We can also see it in the advance specifications in most of the shop manuals.
Converting the advance specifications to crank degrees and rpm, and adding to them the recommended initial timing of 10* BTC, the acceptable range on an engine looks like this
Here's some timing measurements of a DC/MP vacuum advance distributor on an engine.
Advance in Crank degrees, Engine RPM.
If the engine could have been idled below 900 rpm we would know if the initial timing was 12* or something less.
I suspect it was actually a couple degrees less. This particular engine would have liked 16 - 18* initial.
Anyway you can see in the timing plot how the two springs work.
We can also see it in the advance specifications in most of the shop manuals.
Converting the advance specifications to crank degrees and rpm, and adding to them the recommended initial timing of 10* BTC, the acceptable range on an engine looks like this
