see that linear , blue line (ramp) that is the weights against those springs, and then ends at the stops.
on our car, my guess, ends at max torque. point. (IDK we dont have carbs here)
max hp is at 6000 rpm on g13, 5400 on g16
max torque is 3500 g13, and 3000 on g16.
so i bet the curve on the G15 for blue line goes to max at 3000 rpm. called the ALL IN , advance.
the pink line is based on many factors .
(smog, discounted)
1: engine displacement.
2: AFR (air fuel ratios) 12.5:1 is common, at tip in, if not carb is setup wrong.
3: compression ratios.
4: ratio of piston diameter to stroke,
5: what the mech, advance did.? (this is first rule inside dizzy,)
6: engine load, (hills, weight of car, etc)
my guess is your pink line all-in advance is totally wrong. due to G13 wrong part. for this car.
if you remove the vac, pot????
to say do racing (not ever racing below 2000 rpm)
the first step is to retune the mech, advance, the curve above tells you why.
and then tune the carb to match that.
note again how aggressive the vacuum advance is.... (all a function of the advance pot spring and carb ported vacuum port actions)
that vacuum pressure works against that spring, in complex way.....
this is why I said in the beginning
to put in stops on the vac pot, rod plate. if it goes to far, limit it, id never change static time, why do that?
static timing is for cranking, only.
on our EFI cars the idle advance can run 15 degree';s at 800 rpm, to save fuel....
now the racing why? (they use custom efi now, but, back long ago...)
we put the distributor on the dizzy machine (SUN)
then remove the vac, advance, and lock the plate down so it can't move.
a pure mech, distrib now. (will work great if driven correctly)
then with a new set of racing weaker advance springs installed, we, get fast advance, sooner. way sooner. near 3000 rpm.
and last we carve up the weights to the total advance, so it can hit 35 degrees (or what ever the engine demands"book data")
but will ping, when you overload the engine, something that does not happen racing, say on a flat track.
on a street car , it does get overloaded on hills. or shifting wrong (m/t)
The stock car, normally ,the vacuum advance retards and the ping ends.(vacuum drops , on overloads)
that is about it , all ways, using no EFI spark systems.
on our car, my guess, ends at max torque. point. (IDK we dont have carbs here)
max hp is at 6000 rpm on g13, 5400 on g16
max torque is 3500 g13, and 3000 on g16.
so i bet the curve on the G15 for blue line goes to max at 3000 rpm. called the ALL IN , advance.
the pink line is based on many factors .
(smog, discounted)
1: engine displacement.
2: AFR (air fuel ratios) 12.5:1 is common, at tip in, if not carb is setup wrong.
3: compression ratios.
4: ratio of piston diameter to stroke,
5: what the mech, advance did.? (this is first rule inside dizzy,)
6: engine load, (hills, weight of car, etc)
my guess is your pink line all-in advance is totally wrong. due to G13 wrong part. for this car.
if you remove the vac, pot????
to say do racing (not ever racing below 2000 rpm)
the first step is to retune the mech, advance, the curve above tells you why.
and then tune the carb to match that.
note again how aggressive the vacuum advance is.... (all a function of the advance pot spring and carb ported vacuum port actions)
that vacuum pressure works against that spring, in complex way.....
this is why I said in the beginning
to put in stops on the vac pot, rod plate. if it goes to far, limit it, id never change static time, why do that?
static timing is for cranking, only.
on our EFI cars the idle advance can run 15 degree';s at 800 rpm, to save fuel....
now the racing why? (they use custom efi now, but, back long ago...)
we put the distributor on the dizzy machine (SUN)
then remove the vac, advance, and lock the plate down so it can't move.
a pure mech, distrib now. (will work great if driven correctly)
then with a new set of racing weaker advance springs installed, we, get fast advance, sooner. way sooner. near 3000 rpm.
and last we carve up the weights to the total advance, so it can hit 35 degrees (or what ever the engine demands"book data")
but will ping, when you overload the engine, something that does not happen racing, say on a flat track.
on a street car , it does get overloaded on hills. or shifting wrong (m/t)
The stock car, normally ,the vacuum advance retards and the ping ends.(vacuum drops , on overloads)
that is about it , all ways, using no EFI spark systems.
http://www.fixkick.com