which distributor advance springs?

grumpyvette · May 16, 2014

milky said:
I've got my new dist and I'm stumped on how to choose the correct springs/advance limiters or weights for my application. to set the advance curve I'm too use one of the three sets of included springs.much like the msd.gives me a chart on the springs and where they will put all my timing in @said rpm/crank degrees.it also includes advance limiters as well.much like the msd had the bushings.distributor comes with three different sets of advance limiters. These allow the maximum mechanical advance to be limited to 20, 16 or 12 degrees. my question is,what info do i need to figure out which springs/advance limit to choose?i have no idea how to choose the correct parts and the chart it came with doesn't help.thanks for the help.

step one
graph the current ignition advance curve, you can't possibly fix or adjust something without knowing where your starting from
if you don,t have a marked damper on your engine already, you need to verify top dead center TDC and verify your ignition advance curve

stop by a local speed shop and buy the correct length timing tape to stick on your damper, diameter

http://www.summitracing.com/search/part ... =Ascending

on a performance chevy V8 this chart posted below,is where I generally try to start from, and then I modify it as required, too match what the engine tune tells me the engine likes after I get the fuel/air ratio to about 14.7:1-14:4 at idle , too about 3000rpm and from there up I want it too slowly and predictably transition too a richer ratio of about 12.6:1-12.8:1 at peak power, the leaner ratio keeps the plugs from fouling at idle and during most street driving, the richer ratio produces better peak torque and helps reduce detonation under high heat and loads

READ THRU THESE LINKS IT WILL HELP
http://www.pontiacstreetperformance.com/psp/distcurve.html

viewtopic.php?f=70&t=1015

viewtopic.php?f=70&t=967

viewtopic.php?f=70&t=4683

viewtopic.php?f=70&t=3034

viewtopic.php?f=70&t=1809

set the float levels and verify the fuel pressure consistent at about 5 psi entering the carb inlet port
Idle- up too about 2500 rpm try for 14.7:1-15:1 f/a ratio
from about 2500 rpm- too about 4500 rpm try to smoothly and predictably transition the fuel/air ratio mix richer to about 13.5:1
from about 4500 rpm- too about 6500 rpm try to smoothly and predictably transition the fuel/air ratio mix richer to about 12.5:1
this is only a starting point on the tune but it generally gets you in the ball park and tends to reduce the chances of the engine reaching detonation conditions.

which distributor advance springs?

grumpyvette

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