Vacuum advance
@dartfreak75 I'm just telling you straight up what I'm observing. That's not talking down - that's being honest man to man, FABOer to FABOer. Sorry you took it otherwise.
Nothing wrong with thanking people.
The only thing I can say I'm smart about is to say with absolute authority that none of us know what the advance curve is in your distributor.
This is what I have suggested you do.
Take the timing readings from as slow as you can get the engine to run, and then in regular increments of increasing rpm.
All this stuff about how things work, including what I posted, are all distractions.
You can try things randomly and you will get random results.
And maybe because you are you, and we are all different, that's what you need to do.
Here was the detailed version from the previous thread.
The way to settle what the advance looks like is to get it to idle slow and then lock down the distributor and increase rpm.
If you can get 600 or 650 rpm great.
maybe do the low speed ones twice because one the engine is hot there is a better chance of idling it slow.
Try to measure with increasing rpm rather than letting off the throttle as there is some uh er slop.
You can
measure the rpm for every increase in a degree (or two)
or
measure the timing for every 100 or 150 or 200 rpm. In the mid and upper rpms you can space that out to every 250 or 500 rpm.
Whichever is more convenient.
For 3500 to 4500 rpm I usually just do something that is almost like winging it. I open the throttle quick take a quick measurement and let it come back down.
If it doesnt feel safe to you dont do it. We all of differnt risk tolerances for different things.
When you have that all written down, we can plot it out.
Then you'll know what the advance is doing.
Also, if you are later going to use this lwith vacuum advance you can also see where problems may occur and head them off.
Then you can use whatever methods you want and you will be able to track the effect of the change or modification you made.
Some techniques will make more sense than others depending on waht you find.
It's something like the debate with aiming a rifle as to whether to use a 6 o'clock or a standard sight picture.
Different people have different preferences, and sometimes that varies with the circumstances.
However if you find yourself with a fixed elevation firearm that shoots best with POA at 6 o'clock then you know what to do if you want to hit center.
But you're not going to know that until you go shoot some 50, 100, 200 and 300 yard targets.