Custom distributor curving.
To limit the total advance you need to shorten the travel of the slots on
the T bar. Remember distributor advance is x2 to the total. So if I am
setting my initial at 18 and I want 34 total that leaves me 8 degrees
advance in the distributor, 8x2=16 +18=34.
You will need to weld or solder the outside of the slots to shorten the
travel to limit your total. The numbers I have are close and should get you
within 2-4 degrees. I have found I am about 2 degrees off but it might
vary from distributor to distributor. Use the numbers below for reference.
dist. degrees / slot size
6.............. .340
7............... .355
8............... .375
9............... .390
10.............. .405
11.5 ........... .420
12.............. .435
13.............. .445
14.............. .460
15.............. .475
16.............. .490
17.............. .505
18.............. .520
This photo shows the shortened slots.
Make sure all the sharp edges are removed and the slots are clean to the
weight pins can move freely in the slots.
The tricky part for the curve is getting the springs to come in when you
want. If you are happy with your current curve, put it all back together
and away you go. If you want a performance curve to bring in your total
around 2200-2500 rpm you will have to play with springs to get that set
right. Many have had luck with just removing the heavy spring. For me
that just brought my total in by 1500 rpm which is too low. I have two
of the lighter stock springs in and will fire that up tomorrow and let you
know how that works.
To limit the total advance you need to shorten the travel of the slots on
the T bar. Remember distributor advance is x2 to the total. So if I am
setting my initial at 18 and I want 34 total that leaves me 8 degrees
advance in the distributor, 8x2=16 +18=34.
You will need to weld or solder the outside of the slots to shorten the
travel to limit your total. The numbers I have are close and should get you
within 2-4 degrees. I have found I am about 2 degrees off but it might
vary from distributor to distributor. Use the numbers below for reference.
dist. degrees / slot size
6.............. .340
7............... .355
8............... .375
9............... .390
10.............. .405
11.5 ........... .420
12.............. .435
13.............. .445
14.............. .460
15.............. .475
16.............. .490
17.............. .505
18.............. .520
This photo shows the shortened slots.
Make sure all the sharp edges are removed and the slots are clean to the
weight pins can move freely in the slots.
The tricky part for the curve is getting the springs to come in when you
want. If you are happy with your current curve, put it all back together
and away you go. If you want a performance curve to bring in your total
around 2200-2500 rpm you will have to play with springs to get that set
right. Many have had luck with just removing the heavy spring. For me
that just brought my total in by 1500 rpm which is too low. I have two
of the lighter stock springs in and will fire that up tomorrow and let you
know how that works.
