Afternoon all. I am having a few problems all of a sudden with my Evolution 1.20 2 stroke glow engine. It rather ruined the flying side of my Strathaven airshow and I am still puzzled as to why it has happened all of a sudden.
To begin with this engine was run in on the aircraft and as such was inverted the whole time. Apart from having the tank higher than the carb (which induced the engine flooding if it was sitting long enough) there were no problems. The engine was run in with accordance to the instructions and with a few tanks of fuel through it there were no problems. A week later the aircraft was successfully tested at Glenrothes and there were no problems with the engine still. A few days later the aircraft was flying again and the second startup took the propellor and spinner off and this is when the problems began. As such every third or fourth time I try to fly this model the spinner and propellor are loosened on startup as if the engine has gone hydraulic. However, this as I have tested even happens when there is no fuel present. A few members with many years experience pointed out at Strathaven that the compression could be too high and this coupled with a powerful starter could be causing this issue. Also after inspection I found that the original Evolution glow plug and a new one I had fitted were both cracked. Even now while having a look at home the engine is almost impossible to turn over now. I shall try to post a picture later if I can but there seems to be a nick in the casing at the bottom end as if the conrod has hit the side on rotation. Has anyone come across this problem on any engine? I'm rather gutted as I havn't had this problem before and when it runs it doesn't miss a beat. But suddenly starting it is a major problem.
Thanks in advance gentleman
James