MAX RPM DROP WITH 100LL
Hello,
Due to govt regulations, oil companies in India had increased the ethanol content in MS 95 to 20% from the earlier 10%. As a result, I had to switch the fuel from MS95 to 100LL. Post this change , initial performance of the engines were okay. However, gradually we noticed the Max RPM achieved by the engine had drastically reduced. The aircraft was able to achieve a max RPM of around 5000 to 5100 during take off roll. At times the RPM is falling below the minimum ground value of 5000 RPM. multiple checks of carburettor,synchronisation, spark plugs were done without any positive results. Also, increase in coolant temperature was observed to be higher. After start, warming to taxi , the Coolant temperatures were reaching close to 107 and pushing the limit of 120quite rapidly. Any suggestions on this will be welcome.
