[Diy_efi] Runaway turbo diesel?

don.broadus at exeloncorp.com don.broadus
Wed Sep 12 20:16:55 UTC 2007

That kinda settles the question of should I build a dyno cell or just run it on the open floor.

-----Original Message-----
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]On
Behalf Of Mike Yates
Sent: Wednesday, September 12, 2007 2:36 PM
To: diy_efi at diy-efi.org
Subject: Re: [Diy_efi] Runaway turbo diesel?

I got a call from a friend from down under the other day yelling about
a blown BBC with like 50 psi of boost and about 90psig (50
differential Pressure) of fuel...any way the injectors started to
puull out on the dyno and the room filled with gas mist. By the time
it was realized what was happening, something sparked, He said it blew
off the steel roof of the dyno room. oops....

I know not related but still humorous,,,atleast from here.


On Wed, 12 Sep 2007 14:18:16 -0500, you wrote:

>Thanks for an amazing story. That is the first engine test story where the dyno room was consumed
>instead of the engine under test.  
>-----Original Message-----
>From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]On
>Behalf Of WSCowell at aol.com
>Sent: Wednesday, September 12, 2007 2:02 PM
>To: diy_efi at diy-efi.org
>Subject: [Diy_efi] Runaway turbo diesel?
>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...
>Will C
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