123 Ignition Distributor Timing Curve, Curve for carbureted 2056 Options

[SteveNMaine]

I am looking for the basic timing curve settings for a 123 TUNE+ 4-R-V-P distributor for a dual 40 IDF carbureted 2056.

I have been all over the different forums and really looking for more specific information for my build.

Thanks.

[Jack Standz]

@flipb

OK, thanks for the response.

Just to clarify, you're saying that you're firing the sparks in your 2056 at TDC (top dead center) from 0 to 1,000 RPMs?

That seems way too late. How is low RPM performance?

[flipb]

@flipb

OK, thanks for the response.

Just to clarify, you're saying that you're firing the sparks in your 2056 at TDC (top dead center) from 0 to 1,000 RPMs?

That seems way too late. How is low RPM performance?

As I understand it, the 1-2-3 software draws in the section of the advance curve between the points that I programmed in. So linearly, since I have zero advance at 500rpm and 5 degrees at 1000rpm, it should look like:

500rpm - 0 degrees
600rpm - 1 degree
700rpm - 2 degrees
800rpm - 3 degrees
900rpm - 4 degrees
1000rpm - 5 degrees

Since it idles around 900rpm, it's never really running with spark at TDC except perhaps during cranking. Idles fine.

[SteveNMaine]

@flipb

OK, thanks for the response.

Just to clarify, you're saying that you're firing the sparks in your 2056 at TDC (top dead center) from 0 to 1,000 RPMs?

That seems way too late. How is low RPM performance?

As I understand it, the 1-2-3 software draws in the section of the advance curve between the points that I programmed in. So linearly, since I have zero advance at 500rpm and 5 degrees at 1000rpm, it should look like:

500rpm - 0 degrees
600rpm - 1 degree
700rpm - 2 degrees
800rpm - 3 degrees
900rpm - 4 degrees
1000rpm - 5 degrees

Since it idles around 900rpm, it's never really running with spark at TDC except perhaps during cranking. Idles fine.

So, if I set the 123 timing from 10 @ 950 to 28 @ 3500 it will fill in equal increments of advance across the RPM range?