Just a while ago, the dissy in my E-type decided to die. A friend of me has given me a spare 123ignition, the early version with the curve selector.
It has engraved XK 12-04-08 in it, so it's the right dissy for the E-type.

I have checked the data about the original ignition in the workshop manual, and the the data from the website of 123ignition, but I can't quite compare them with each other.

For a start, the original dissy starts advancing at 450rpm already, while the 123 starts advancing only at 1200rpm.
The manual doesn't say when mechanical advance ends, but the 123 can give a max. mechanical advance of 24 to 32 deg.
Furthermore, the original dissy starts advancing at about 2inHg, while the 123 starts at 4inHg.

So, I find it rather hard to choose the right curve. Anyone who can tell me which ones are a good guess? I currently have the static timting at 10 degrees BTDC.
The data for the 123 ignition can be found here: 123ignition

Thanks for the help!

 

Start off with curve number 0. If you don't like the performance you can always try other curves but "0" is the correct one for your car. Static timing at 10° is also correct and it should be around 32-34° max at 3400 rpm.