Ignition timing issue

[dante53]

I have a Bosch 51 distributor on my 230 SL and I recently replaced points with a Hot-Spark electronic ignition kit (pertronix clone). The problem is that I cannot get the required 2-4 degrees ATDC at idle (vacuum connected). With anything less that 4-6 degrees BTDC the idle gets too low, even with full idle enrichment of FIP, and the engine would stall. With 6 or even more degrees BTDC the car idles e runs well, but I get 40 degrees advance at 3k RPM which I think is too much.
The battery is new, the coil (Bosch red coil) is new, spark plugs and cables are in good shape
Any suggestion?

[Cees Klumper]

It may have something similar on my car - when I set the timing to factory specifications, the engine does not run as well as when I adjust it 'by ear'. I think my timing chain is stretched somewhat, causing the timing mark to mis-read by X number of degrees. So I have been setting the timing by feel rather than spec, and I need to replace the timing chain and then check again. I recall Dr Benz telling us he adjusts the timing by feel as well, so I feel somewhat covered   

[dante53]

Hi Cees. That's just what I did, but I notice that my engine is quite reluctant to rev over 4k RPM. The maximum loaded RPM I got is 4,5K but the noise was so high that it I feared to break the engine. I think that this is due to excessive advance at high RPM. Until 3/4K RPM the car runs very well and since I did the linkage tour it's a charme at lower RPM.