Rpm Issues

[druidjaidan]

12 hours ago, Yetti said:

True but since there no sparky in the area and the combustion is a flash.....    I can see when the sparky is happening and the tip of the plug is hot (like a soldering iron)  but with it shorted it be cool. 

For the purpose of this thread.   I say that is oil bridging the gap.   So hopefully a new set of rings, lap the valves since it is off and should be good to go.    

 

  Note my very first suggestion was to pull the plugs.   They usually tell the story.

Yup.  Important lesson learned. Mechanic on site heard the story and thought the governor so went with it. Plugs showed that something with that one cylinder was obviously wrong. 

[Yetti]

governors tend to govern or not.   And when they don't it is an obvious event.  And expensive.

[druidjaidan]

On 8/2/2019 at 5:59 PM, Yetti said:

governors tend to govern or not.   And when they don't it is an obvious event.  And expensive.

He felt the issues we were describing was "surging".  In retrospect it wasn't.  The loss of top rpm is probably the control cable.  I'm getting that looked at as soon as I can get in with a mechanic.  We have no buffer on the prop control, it goes all the way to the wall.  I had not noticed that before.  I suspect it's slipped or something.  Probably end up replacing it unless my local mechanic has other advice.

Edited August 5, 2019 by druidjaidan

[bradp]

Sounds like this may have been diagnosed by an in flight LOP mag check.