RMarvin86.
Quote :> To keep this thread alive I think it may be really interesting to understand WHY you're (sic) engine failed! or the reason it may happen. <
The EFATO was not a TOTAL engine failure. Just sufficient power reduction (not even enough to maintain S & L) to leave no choice but to forced land , and quick.
Hot Gypsy Major/100LL fuel - caused exhaust valves on two cylinders to gum up. Resulted in couple of maintenance suggestions, one of which was to ream out the valve guides a few 'thou' more when zeroing engines after a rebuild.
Had the problem a couple of times before but not so drastic. Gypsys were designed for Low Octane fuels (non-leaded 73 Oct) not Low Lead. Lead reacts with aluminium-bronze and aluminium cylinder heads. Also hotter engine temps. caused lube oil to lacquer on the valve stems/guides, I believe.
Had another shutdown a long time ago due loss of oil pressure, via a mis-fitted NRV in the prop.control unit of a turboprop........ but that's another story !
