Originally Posted by theduff
Iím trying to come up with the scenario that caused my Sump (explosion).
Understandably. Lycomings do pop in the sump. Right now I don't know precisely why.
So anyway, tell us more about the setup....mags or waste spark EI, OAT and engine temperature, priming, cranking speed, etc. Obviously the throttle was closed.
Blowing out the intake tube o-rings is pretty impressive. Each is trapped between two steel rings on the tube, and when the tube is then shoved up into the plenum spigot, there is very little room for escape. Not something I've heard before, but that means little. Is it a common occurrence?