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Is this Normal

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Aaron

12-21-2002 16:58:14




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Is it normal to have flames come out the stack on a JR R with a load on it? Will It hurt anything?

Thanks Aaron




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CJDave

12-23-2002 05:25:06




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 Re: Is this Normal in reply to Aaron, 12-21-2002 16:58:14  
To be honest, I've never been quite comfortable with an extremely....and the key word is "extremely"....hot diesel exhaust, especially if the engine does not have an exhaust gas temperature gauge on it. When we ran Cat engines on stationary work we sometimes had to really crowd the maximum, and when we did, the exhaust manifolds got almost red hot. Incredibly, you can actually "see" right through cast iron when it is at very high temp and you are running at night. You can actually see the valve gear. The thing that worried me was that if we were burning that hot, was there enough air to go with the fuel we were pouring through that engine? Since we had turbocharged engines, care had to be taken to not melt the turbo down, so if you are running naturally-aspirated, you'd have a little more leeway. 1100-1220 degrees F was the upper-upper limits that we set for our turbos to live through. Hot exhausts can be due to over-fueling, but they can also be due to late injection. When I check diesel engines under load with an infrared camera I can spot a "lazy" injector, or one which is out of adjustment and dumping too much fuel in by checking the temperature of each exhaust port on the engine and comparing them one to another. With diesels, it's a matter of BURNING THE FUEL, and that takes air, and the air supply is sometimes inadequate due to altitude, or some kind of intake restriction. THAT's when you can burn down the engine..... when the air supply is inadequate.

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G Taylor

12-21-2002 20:05:06




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 Re: Is this Normal in reply to Aaron, 12-21-2002 16:58:14  
It shouldn't be flames from unburned fuel. Just exhaust gases hot enough that suspended particles of carbon are glowing incandescent.



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BJ

12-21-2002 19:09:04




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 Re: Is this Normal in reply to Aaron, 12-21-2002 16:58:14  
As far as I know all the 2-cyl diesels will run fire out of the exhaust under load as long as your water temp. is OK just let her go won't hurt a thing



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JKC

12-21-2002 17:25:47




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 Re: Is this Normal in reply to Aaron, 12-21-2002 16:58:14  
Aaron....I cannot tell you if it will "hurt anything", as I am not a diesel mechanic. I CAN tell you that it was quite normal for our JD R to have flames shoot from the exhaust when it was under load, so maybe it IS normal. Hopefully, someone with more mechanical knowledge can answer that for us.



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Ross

12-21-2002 22:53:57




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 Re: Re: Is this Normal in reply to JKC, 12-21-2002 17:25:47  
doesnt hurt the motor at all, sometimes it can be a little hard on the muffler, but thats no big deal



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