Small Alfa engines need more maximum advance. So if you move their curves to give 42 degrees or so then the static advance will be similar to that of a 2L with 36-38 degrees.
I have run the Bosch 006, the Bosch 045 and the Shankle curves with my 2L motor. It is quite hot, I would guess around 150 HP. The 006 gave sluggish response, poor fuel mileage and the slowest idle that you can imagine. I could not detect a lot of difference between the other two. The 045 has a better idle and I have had the max advance up to 40 degrees without pinging. I imagine that the Shankle curve would be more likely to ping with that amount of max advance. I only ran the Shankle curve with 36 degrees.
I have settled for the 045 with 38 degrees max advance. It seems to have a bit more above 6000 with 38 degrees max compared to 36. There did not seem to be any benefit when I advanced it to 40 so I dropped it back to 38.
This is the reason why the 123 is a cool piece of equipment if you want to learn about the effects of ignition timing on your engine.
85 GTV6 3L
76 Suzuki GT500
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