Forced Inductions Turbo Stress Test
10-05-2008, 11:56 PM
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Forced Inductions Turbo Stress Test Thought you guys might like this.Buddy of mine bought a Custom Single from www.Forcedinductions.com ,For his 5.9 cummins diesel,Loved the turbo then the bad news.They where sled pulling in Tennessee 2 weeks ago,the rack in the fuel pump stuck wide open,the truck ran at 6000 rpm for 4.5 minute , while they watched as the fuel shutoff wouldn't kill it.,it ran till the motor melted 4 pistons.He called with the bad news and said the turbo was toast,after removal which it wouldn't turn at all, we found the reason,the pistons that melted has so much aluminum in the turbine housing that the buildup stoped the turbine from turning.The amazing thing is he sent the turbo for FIS and they said the only problem was the damage to the turbine and that's all that needs replaced,simply amazing that a turbo stood that.Oh and he said the head,manifold,turbo and 8 feet of the exhaust where Cherry red for at least 15 minutes after the engine finally died.Thanks FIS Turbo for the help.
Last edited by Stupid Boost; 10-06-2008 at 12:47 AM. Reason: spelling
10-06-2008, 02:54 AM
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There are 2 ways to kill a diesel engine stop the air going into the engine or stop the diesel. It sounds like his fuel wouldn't shut off & the motor ran away thus melting the pistons & throwing piston slag through the exhaust into the turbine.
10-06-2008, 09:39 AM
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I run a Detroit Diesel shop and we have had this happen before when oil entered the charge air system and the engine "ran away" The best bet would be to undo the charge piping and block off the air.....however.....with that said....when an engine designed to go only 2150 RPM takes off to 5000 RPM and is making 50 pounds of boost, there aren't a lot of people (thank god) that will hop in there and pull apart these items. Better to lose an engine than an arm. I have often wondered why they dont have emergency throttle blade type safetys that can be pulled to stop the air flow from entering the engine. Obviously charge air cooler or piping damage would most likely occur, but thats better than complete engine damage.
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10-06-2008, 10:32 AM
#11
Guys, when you run mechanical everything...pulling fuses does nothing. No way to shut it off, other then a air valve, which is being installed on this truck now by the customer...lol. The EGT's reached over 2500!!! Melted everything including the pistons which as you can see are now attached to the turbine housing...lol
10-06-2008, 02:26 PM
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i saw a run away Diesel suck up a phone book when someone tried to cut off the air to it...it stopped, but the phone book was mostly inside of it by the time it did.
10-06-2008, 02:40 PM
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hell yeah... 