Hi Guys,
thank you for the help.. I just wanted to give status back after this long time.. It took a bit as the engine bay was more or less completely disassembled.
First of all, the oil was changed to 20w50 mineral oil with high zinc percentage. While dissembling the engine the following things were found and give an explanation for the behaviour:
Findings:
1. The camshaft gear for connecting ignition and oil pump had the wrong gear on the ignition side. this was wearing off the camshaft and impacting the ignition system. Ignition got delayed and was causing the engine not taking up temperature and bad rev behaviour.
2. The ignition system was completely oxidised inside. The adjustment was not working at all.
3. The valve sleeves were not closing valve rods enough. Reason: heavily ported cylinder head and thermic pressure.
Everything is fixed now and the car runs fine meanwhile. In this process i found out, that the used material was designed to run this engine over 7'000 rpm.. and that i was shifting far to early
Thank you for your support
/Marco
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