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11-04-2012, 07:23 PM
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#51
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Diamond Member
Join Date: Aug 2000
Posts: 8,552
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It's a rich mixture. Most cars' ECUs are tuned to go very rich at WOT, since leaning out at full throttle or high RPM means very hot EGTs - melted pistons, burnt valves, etc.
General rules are:
Black smoke/soot - rich mixture
Blue smoke - oil
White smoke - coolant (or water vapor)
Green smoke - awesome
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11-04-2012, 07:59 PM
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#52
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Lifer
Join Date: Jan 2001
Posts: 26,410
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11-04-2012, 08:03 PM
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#53
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Diamond Member
Join Date: Oct 1999
Posts: 4,621
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I knew it was going to be those colored smoke tires!
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11-04-2012, 08:32 PM
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#54
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Diamond Member
Join Date: Jun 2012
Posts: 3,476
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What about if I'm encountering a purple haze? 
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11-04-2012, 08:33 PM
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#55
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Lifer
Join Date: Jan 2000
Posts: 11,954
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Quote:
Originally Posted by Ferzerp
Naw, I meant the "happens to every car when you floor it" guy.
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Why don't you quote me if you want to disagree?
Maybe I should clarify: EVERY car puffs some black smoke out initially when you floor it. I've never seen any car, ever, that doesn't.
Now, I did not mean to imply that if you floor a car, it'll just blow black fuel smoke until you let off of it, but when you initially floor it, there will be a puff of black smoke. It's unavoidable. When you floor a car and it goes to full rich, the initial dump of fuel doesn't all get burned, and you get a puff of smoke.
Some do it more than others, but all do it some. Ride behind someone's car and have them floor it while you watch the tail pipe, you'll see it.
__________________
I asked a ref if he could give me a technical foul for thinking bad things about him. He said, of course not. I said, well, I think you stink. And he gave me a technical. You can't trust em. -
Jimmy V
"One of the reasons I left Sabbath is Van Halen was blowing us off the stage every night. It was embarrassing." Ozzy
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11-04-2012, 09:15 PM
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#56
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Diamond Member
Join Date: Oct 2009
Location: Gone fishin'
Posts: 3,658
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Quote:
Originally Posted by sjwaste
General rules are:
Black smoke/soot - rich mixture
Blue smoke - oil
White smoke - coolant (or water vapor)
Green smoke - awesome
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Pretty much what I was taught long ago.
But you forgot one white smoke source, someone dumped a bunch of ATF into your gas tank. 
__________________
Heat
Ebay
"As soon as men decide that all means are permitted to fight an evil, then their good becomes indistinguishable from the evil that they set out to destroy."
-Christopher Dawson
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11-04-2012, 09:16 PM
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#57
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Lifer
Join Date: Jan 2004
Posts: 10,751
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Quote:
Originally Posted by phucheneh
What about if I'm encountering a purple haze? |
Stop taking LSD.
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11-05-2012, 08:12 AM
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#58
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Diamond Member
Join Date: Sep 2010
Location: NH
Posts: 3,185
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Quote:
Originally Posted by sjwaste
It's a rich mixture. Most cars' ECUs are tuned to go very rich at WOT, since leaning out at full throttle or high RPM means very hot EGTs - melted pistons, burnt valves, etc.
General rules are:
Black smoke/soot - rich mixture
Blue smoke - oil
White smoke - coolant (or water vapor)
Green smoke - awesome
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This. I've seen puffs of black smoke behind modded cars and stock cars. I've seen it correlated to acceleration enrichments, which are typically much richer than normal running conditions. My MS3 hits ~9.3:1 AFRs there, resulting in a nice little puff of black smoke for a moment.
__________________
2009 Mazdaspeed3 - DD
1991 Turbo Miata - Toy
Experience is knowing you were an idiot. Common sense is trying not be an idiot. Wisdom is knowing that you will still be an idiot.
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11-05-2012, 08:54 AM
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#59
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Diamond Member
Join Date: Aug 2000
Posts: 8,552
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Quote:
Originally Posted by JCH13
This. I've seen puffs of black smoke behind modded cars and stock cars. I've seen it correlated to acceleration enrichments, which are typically much richer than normal running conditions. My MS3 hits ~9.3:1 AFRs there, resulting in a nice little puff of black smoke for a moment.
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Jeez, my Supra (stock ECU) will dip down closer to 8:1 at WOT. It's kind of a disaster if you're in the wrong part of the power band and the turbo lags. You can really leave a nice cloud. 8.4:1 compression, off boost, and 8:1 AFR.
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11-05-2012, 08:54 AM
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#60
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Diamond Member
Join Date: Aug 2000
Posts: 8,552
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Quote:
Originally Posted by Meghan54
Pretty much what I was taught long ago.
But you forgot one white smoke source, someone dumped a bunch of ATF into your gas tank. |
The car will actually run with ATF in the tank? Nice. I did not know that.
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11-05-2012, 09:06 AM
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#61
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Diamond Member
Join Date: Feb 2003
Location: Chicagoland, IL
Posts: 3,492
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Quote:
Originally Posted by sjwaste
The car will actually run with ATF in the tank? Nice. I did not know that.
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A quart to 15 gallons I don't think would have much of an effect other than maybe some smoke. It was used that way in the Wankel engines at times as seal lube so that the oil injector could be removed. ATF smokes like a mother though if the concentration is high enough.. On the mid 80's fuel injected RX-7 with the leaking fuel injectors, a couple of cap fulls was a quick way to start the engine and break carbon out of apex seals.
Biggest issue I can see is ATF loves to devarnish stuff so it might stall the car if the fuel filter gets plugged up with the trash that was in the tank.
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11-05-2012, 09:56 AM
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#62
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Diamond Member
Join Date: Jun 2012
Posts: 3,476
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ATF is basically Seafoam (in practice- I know they're not actually the same). Maybe better. I've never had occasion to use the latter, but ATF does a great job of desludging engines without resorting to solvents. I've heard of it being IV'd into the intake as an induction cleaner, too, but that's a bit more doubtful...
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11-05-2012, 10:07 AM
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#63
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Diamond Member
Join Date: Sep 2010
Location: NH
Posts: 3,185
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Personally, I would NOT want to burn ATF, gear lubricating additives in ATF are cancer-tastic.
__________________
2009 Mazdaspeed3 - DD
1991 Turbo Miata - Toy
Experience is knowing you were an idiot. Common sense is trying not be an idiot. Wisdom is knowing that you will still be an idiot.
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11-05-2012, 10:10 AM
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#64
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Diamond Member
Join Date: Feb 2003
Location: Chicagoland, IL
Posts: 3,492
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Quote:
Originally Posted by phucheneh
I've heard of it being IV'd into the intake as an induction cleaner, too, but that's a bit more doubtful...
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It was fantastic for cleaning up wankel motors. If you had a stuck seal you would let the engine ingest some and leave it sit for a few hours then restart. It would below smoke but once it started the ATF helped keep compression until you could hold the engine revs up a bit at which point if you were lucky the seals would unjam.
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11-05-2012, 02:35 PM
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#65
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Diamond Member
Join Date: Aug 2000
Posts: 8,552
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Quote:
Originally Posted by JCH13
Personally, I would NOT want to burn ATF, gear lubricating additives in ATF are cancer-tastic.
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It's a safe bet that any petrochemical in that ATF red color is bad for you.
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11-05-2012, 11:50 PM
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#66
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Lifer
Join Date: Jan 2004
Posts: 10,751
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Speaking of AFRs, found this old video:
https://www.youtube.com/watch?v=v1I9ZjdbdcQ
Gives you a decent idea of what its doing.
Last edited by exdeath; 11-05-2012 at 11:52 PM.
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