[Diy_efi] Runaway turbo diesel?
Thu Sep 13 05:54:08 UTC 2007
Yes amazing incident,
these days I would guess that if you wanted an enclosed dyno room you would have
very good exhaust ventilation for the room as a whole and also just in case a large
burst relief panel or maybe part of the ceiling...
At 03:01 AM 9/13/07, you wrote:
>When I was serving in Germany in 1979 as an engineering officer in the
>British Army, we had an interesting blow-up with a tank engine at our Workshop
>unit in Soest.
>It was an L60, used to power the Chieftain battle tank. The L60 has 6
>cylinders side by side in line, and 2 crankshafts at opposite ends of the
>cylinders driving 6 opposed pairs of pistons a la Junkers Jumo aero engine. The
>engine is multi-fuel, and usually ran on diesel. It had a massive Roots type
>scavenge blower strapped to the side of the crankcase.
>This engine was on test but the exhaust wasn't coupled up properly and
>consequently the exhaust gases were getting into the test cell, which was a closed
>room at the end of the engine repair shop. The blower intake wasn't coupled
>up to a source of clean intake air (sloppy mistake No.2!!) and breathed the
>ambient air inside the test cell.
>All was well until an oil seal failed, whereupon oil mist started to appear
>in the exhaust and, yes, you've guessed, sucked back into the intake.
>The revs started to rise, the crew panicked and shut down the fuel supply
>but it was too late, the engine went into runaway and the revs went through the
>roof as the engine digested its crankcase oil supply. The entire test cell
>filled with a combustible oil mist and it became a giant combustion chamber.
>After about 30 seconds stoichiometric mixture was reached, and the entire
>chamber (room) blew. It took out the internal walls, every window down the
>repair shop and cracked both end walls of the repair shop building from floor to
>ceiling! By this time everyone had legged it so no-one was hurt, but the
>Board of Inquiry had a field day.
>Never a dull moment in the military...
>Diy_efi mailing list
>Diy_efi at diy-efi.org
>Main WWW page: http://www.diy-efi.org/diy_efi
More information about the Diy_efi