Posted by Jon Hagen on April 12, 2011 at 23:31:46 from (69.26.23.96):
In Reply to: Turbos posted by farmboyWI on April 12, 2011 at 21:57:36:
The wind blowing down the pipe and burning up the turbo old wives tale came up on another site.
Others pointed out that you can't windmill a turbo with it attached to a non running engine, as there is no way for air to flow through such an engine. Others said " why do the companies recommend covering the exhaust when you transport them then??" I got on google and checked every turbocharger builder /rebuilder on the net, checked their warranty / failure analysis page. Not one listed wind blowing down the exhaust pipe and magically spinning the turbo as a reason for a failure. ALL listed covering the pipe to keep dirt, rain, road trash out of the pipe as a reason to cover it and protect the turbo. Think about a rock or bit of metal road trash down the exhaust stack and laying against the turbo exhaust turbine. You start the engine and run it up to fast idle, exhaust flow blows that lump of trash about half way back up the stack. You pull the throttle back to slow idle, exhaust flow decreases and that lump of trash falls back into the turbo that is spinning at 40,000 rpm. Only takes a couple times for it to tear heck out of the exhaust turbine.
Personal experience for me, driving through a truckstop pea rock paved parking area. A semi with a big wheel loader loaded on it is parked back there. The wheel loader curved exhaust stack is uncovered and a little kid is standing there, trying his best to " make a basket" with a pea rock in the loaders exhaust stack. What are the odds he got a granite pea rock down the pipe, I always wondered :-)
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