Posted by NCWayne on January 27, 2013 at 20:27:17 from (69.40.232.132):
In Reply to: runaway diesel posted by mikeman1 on January 27, 2013 at 06:33:55:
One detail I see everyone forgot, even those that mentioned the shutdown flap on a two stroke Detroits air intake. That details is that Detroit can runaway backwards. When running backwards the blower is then sucking air in the exhaust and pushing it out the intake side. Due to the air flow beign reversed it creates a vacuum -vs- a pressire in the air galley around the pistons. Because of that vacuum it can very easily suck engine oil past the oil control rings causing it to run on the engine oil instead of fuel, and run away. Dad choked one down on an elevating scraper years ago while doing a pressure check on the hydraulics controlling the elevating blades. Due to hydraulic pressure in the system when the engine choked the reverse pressure on the pump caused the engine to kick over backwards and it fired back off running backwards. Dad said it was the messiest, smokiest thing he had ever seen. I think he said he stuffed a handfull of rags down the muffler to restrict the flow of air and get it to shut back off.
Long story, but the point is that you just might have to block the "exhaust" at some point to shut down a Detroit cause the flap on the intake isn't going to do anything but pop out of the way under pressure.
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