Goinbroke2
New member
The coil has 20* of advance available, use it how you need it. I'll give an automotive example of what I mean.
My 351C had about 28* of mechanical advance and another 25* or so of vacuum. I found that my engine liked 38* total, all in by 3000 or so.
So, I disconnected the vacuum (drag only engine) and checked, 14* initial and when rev'd it would go to 42*. I tried backing the initial down to 10* but that killed the "hit". So, I wanted 14* initial and 38* total. I pulled the advance plate out and mig'd up the slot that the pin rides in, limiting the movement to about 6*, then I assembled, checked, tore apart and filed, reassembled...wash, rinse, repeat, until I got my 24* of mechanical advance. So at that point I had 14* initial, 38* total, but, it was coming in too late, so then I started playing with various springs to effect the rate. I got one spring from a 391 truck engine and one from a slant six which gave me all in by 3100 I think it was without fluttering. (too light of a spring or running one spring caused timing flutter, bouncing 10* or so at any rpm)
Yes I lived in the sticks and no, there was no such thing as a "speed shop" where I was from, you made everything yourself.
So, how does this relate to a coil that starts out retarded by 20* and as rpm increases it allows it to advance back to 0*? Simple, what is the total timing you want? 35*? then set the initial low rpm timing number at 15* by not using a timing key and then as rpm increases you have your 35*! (or whatever you want)
It's a 20* timing variable guys, like I said, use it however you want to use it.
My 351C had about 28* of mechanical advance and another 25* or so of vacuum. I found that my engine liked 38* total, all in by 3000 or so.
So, I disconnected the vacuum (drag only engine) and checked, 14* initial and when rev'd it would go to 42*. I tried backing the initial down to 10* but that killed the "hit". So, I wanted 14* initial and 38* total. I pulled the advance plate out and mig'd up the slot that the pin rides in, limiting the movement to about 6*, then I assembled, checked, tore apart and filed, reassembled...wash, rinse, repeat, until I got my 24* of mechanical advance. So at that point I had 14* initial, 38* total, but, it was coming in too late, so then I started playing with various springs to effect the rate. I got one spring from a 391 truck engine and one from a slant six which gave me all in by 3100 I think it was without fluttering. (too light of a spring or running one spring caused timing flutter, bouncing 10* or so at any rpm)
Yes I lived in the sticks and no, there was no such thing as a "speed shop" where I was from, you made everything yourself.
So, how does this relate to a coil that starts out retarded by 20* and as rpm increases it allows it to advance back to 0*? Simple, what is the total timing you want? 35*? then set the initial low rpm timing number at 15* by not using a timing key and then as rpm increases you have your 35*! (or whatever you want)
It's a 20* timing variable guys, like I said, use it however you want to use it.