123 Ignition Distributor Timing Curve, Curve for carbureted 2056 Options

[IronHillRestorations]

I’m going to suggest that you have installed the distributor 180* out

[SteveNMaine]

Since every engine is different, and the benefit of the 123 is the ability to customize the curve, there’s isn’t an “official” setting. Start by clearing all points, then add one for 8 degrees at 950rpm, and another one for 30 degrees at 3000 rpm. This should get you very drivable. As you drive, take note of where the flat spots and stumbles are and add points at those rpms. Experiment increasing the timing at those points until the power band smooths out and extends as far as possible.

Before you do anything, though, verify that the 123 is synched with a timing light. Rev the engine to 3000rpm and turn the dizzy until the timing light agrees with the 30 degree point you set. Then lock it down.

I still have not been able to get my 2056 to start with the 123Ignition. It sounds like it wants to start but no joy.

I followed the installation instructions and even talked to the factory, no joy.

I have tried almost every curve I can find on the forums, no joy.

I am sure it is a timing thing but just cannot figure it out.

I am just about ready to give up and sell off the project, two 1974 1.8 bodies, three engines (1.7, 1.8 and the 2056), two side shifter transaxles, etc.

I see no path forward; it has just become too frustrating. This will be the first project I ever walked away from.

[densible1]

That's exactly what happened to me , wasn't pretty result. once corrected all was well again

I’m going to suggest that you have installed the distributor 180* out

[SteveNMaine]

That's exactly what happened to me , wasn't pretty result. once corrected all was well again

I’m going to suggest that you have installed the distributor 180* out

I thought that too at one point but after checking it was right. I may go back to the original distributor before I chuck all of it.

[McTyke]

I have a switch model 123ignition on my 2258 cc engine with Eurocams J Grind camshaft and Weber 44 IDFs. Need to check, but I don't think there is a vacuum connection to the distributor. It's running okay with switch setting "C" but there's some popping or misfiring in the lower rpm range, and cold starting is sometimes tricky (that may be me though). Dynamic timing has been set at 30 * BTDC maximum.

I'd like to know what each of the preset advance curves looks like, but all I can find is the table that's in the 123ignition user manual. Do I assume each preset curve is a straight line between the start and end points? I can't imagine this is the case.

123ignition advised me that either curve C or curve 3 should be good for this engine set up. Any comments or advice from the forum would be great!