Armed Polite Society
Main Forums => The Roundtable => Topic started by: vaskidmark on November 20, 2012, 09:37:25 AM
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http://www.youtube.com/watch?v=uOj6gPwkiXg
Just because it feels almost as good to see it as it must feel to do it.
stay safe.
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:lol: [popcorn]
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So, he's starting a diesel loco? Do they normally have that kind of smoke when they start up?
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So, he's starting a diesel loco? Do they normally have that kind of smoke when they start up?
Never been behind/next to any diesel when it starts/begins to accelerate? Or when some truck jockey pumps the "gas" pedal while idling? Never looked at the exhaust pipe of a diesel auto and wondered why it had all that black gunk?
The thing is, that's almost all pure carbon (lampblack) which does not screw with the ozone or kill baby polar bears. It also falls to the ground fairly quickly and does not combine with anything else to form acid rain. But tree-huggers take one look at that cloud and get the coniptions.
All of which may or may not have anything to do with the thread title.
stay safe.
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Diesel's will smoke a little more at start up since there is no boost, but they are trying to inject sufficient fuel to get it started. When diesels get close to stoichiometric they get smoky, which is ~14.5 air to fuel ratio for typical diesel fuel. The actual afr where visible smoke is noticed depends on the injector design, pressure, injection timing, charge air temp, charge air pressure, compression ratio, etc. For an unfiltered exhaust on a fully warm and boosted engine, the limit is typically in the 15-18 afr range for ~10-15% opacity (this opacity is roughly a small visible puff of smoke). The video appears to be closer to a ~100% opacity.
At low starting speed and idling, mechanical injection systems do not produce full injection pressures which can cause more smoke due to poorer atomization of the fuel.
I suspect that this is a 2-stroke (4-valve) diesel. In which case, it may not have efficient exhaust scavenging at start up with no boost, which hurts the afr.
Finally, this excessive amount of smoke may be due to ether injection at start up (even more fuel, closer to stoich or even excess fuel). Ether injection into the intake is a cold diesel starting aid.
Black smoke is soot and PM emissions. Soot and PM emissions are found to be carcinogenic.
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Black smoke is soot and PM emissions. Soot and PM emissions are found to be carcinogenic.
Well, yeah, if you inhale. So far Barry is the only one who ever admitted inhaling.
stay safe.
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I suspect that this is a 2-stroke (4-valve) diesel. In which case, it may not have efficient exhaust scavenging at start up with no boost, which hurts the afr.
Interesting info. Thanks for posting it.
From what I can see of the locomotive, it appears to be a General Electric product, so it's most likely a 4-stroke design.
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This is the redneck equivalent of a gay pride parade
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More shiny engines..
http://youtu.be/yAf6GScjiHo
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Interesting info. Thanks for posting it.
From what I can see of the locomotive, it appears to be a General Electric product, so it's most likely a 4-stroke design.
Thanks, I wasn't sure since I am not able to recognize locomotives by appearance.
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Looks like a Conrail yard engine.
Can't tell the make/model, but I'll agree that it's probably a GE.
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Never been behind/next to any diesel when it starts/begins to accelerate? Or when some truck jockey pumps the "gas" pedal while idling? Never looked at the exhaust pipe of a diesel auto and wondered why it had all that black gunk?
I used to be a Bradley dismount and a driver. Does that count? How about the skid-loader we use at work?
Never seen any smoke like that, though.