Cold Weather and Black Smoke?

[TxDieselKid]

Does cold air make less black smoke? Since the weather change down here in Texas, happens about 8pm (from 80* to 50*), I notice that there is less black smoke when I get on it.



Please answer if you can. Thanks.





AJB

 

[Diesel Freak]

Yes, the reason for this... ... cold air is more dense, therefore there is more O2 for the engine to use and combustion is more complete.

 

[Gizmo 007]

What he said

 

[Bigsaint]

No doubt about it, mine is to the point that it seems that I have the 3's or less in now . I've been watching the smoke output much more since the addition of the 5's and the stack, seems I get the most smoke when it's real hot and or real humid. Wouldn't humid air be as dense as cold air ??? Not second guessing anyone, just curious as to why thick hot air smokes much more than cold dense air ??? Combustion ???? Alot of members have asked me since Cumminstrkn's dyno run about the somewhat rough idle we have mentioned with the 5's, kinda like an intermitent romp, romp, romp, mixed with a very smooth idle. Only happens on humid days (above 70 % humidity) and when I initially turn on the Ebrake at idle, at all other times they idle as smooth as OEM ETH injectors.



Scott W.

 

[TxDieselKid]

Well thanks for telling me this. I was about to say my COMP box quit working. Big relief.



Humid makes it smoke huh? Well boy will I have fun in Houston this summer, 100* and 100% humind all day, everyday.



Bigsaint,

I heard that lumpy idle on Stefan K's truck and loved it. Thought that was the coolest thing since baked beans. Almost made me say... "Screw the transmission, lets make lump!!!"



Diesel Freak,

How do you get under 300 horses, but nearly 800ft. Lbs? And by the way, I am working on getting that Insite Pro Software still if your intrested!



AJB

 

[Diesel Freak]

Ancient Chinese Secret



794 FT*LBF @ 1950 RPM=294 HP





E-mail me about the rest.

 

[Chad Sheets]

The air is colder, therefor the combustion temps are cooler. Cooler combustion temps make for less power (ideal intake temps for maximum power is between 60-90 deg... anything less you loose some power, anything more you loose some power), however the cooler temps help keep the NOx level down as well as the black smoke. This is how some of the diesel manufacturers are passing the tier 2 diesel emmision requirements. They take the exhaust gases, cool them and reintroduce them back into the combustion process. Cheap quickie fix, but it works for now.

 

[Diesel Freak]

Tx, one more thing, it was about 55F when I dyno'd my truck. So, the aftercooled air temp was just perfect.