I just tossed out my TT39 that would never tune properley and replaced it with an OS37 in my Raptor 30 V2. It runs great and I couldn't be happier. However I am a bit paranoid about my engine after all the hassle I had with the TT39. At one point I thought I had over-heated the TT39 and that that had caused all my tuning problems, but I am not convinced.

Anyway, I got a temperature guage and tried to monitor the temperature of the new OS37. It seems to run quite hot though. When running the best, i.e. lots of power/response to increased collective, no apparent overheating (i.e. no loss of power after a while), lots of smoke, etc. it seems to run at about 135 degrees celsius. Someone on the Raptor/ThunderTiger forum told me that a 30 size engine should run at about 112 degrees. I am using 15% nitro with 18% oil (50/50 castor and synthetic). I have tried to richen it up to drop the temperature and it works, it will drop to about 115 degrees. The only problem is the response to the collective drops significantly and the general power loss is too much to be acceptable.

So, my question is, if all seems to be well and the engine runs hot (according to the guage), is that still okay, in other words, should you ignore the temperature guage? I just do not want to end up with a bum engine again. Any suggestions or comments?