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Old 11-04-2012, 07:23 PM   #51
sjwaste
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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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Old 11-04-2012, 07:59 PM   #52
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Red Smoke?
http://www.youtube.com/watch?v=W7jdd...feature=fvwrel
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Old 11-04-2012, 08:03 PM   #53
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I knew it was going to be those colored smoke tires!
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Old 11-04-2012, 08:32 PM   #54
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What about if I'm encountering a purple haze?
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Old 11-04-2012, 08:33 PM   #55
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Originally Posted by Ferzerp View Post
Naw, I meant the "happens to every car when you floor it" guy.
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.
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Old 11-04-2012, 09:15 PM   #56
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Quote:
Originally Posted by sjwaste View Post
General rules are:

Black smoke/soot - rich mixture
Blue smoke - oil
White smoke - coolant (or water vapor)
Green smoke - awesome



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.
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Old 11-04-2012, 09:16 PM   #57
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What about if I'm encountering a purple haze?
Stop taking LSD.
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Old 11-05-2012, 08:12 AM   #58
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Quote:
Originally Posted by sjwaste View Post
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
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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Old 11-05-2012, 08:54 AM   #59
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Originally Posted by JCH13 View Post
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.
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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Old 11-05-2012, 08:54 AM   #60
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Originally Posted by Meghan54 View Post
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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Old 11-05-2012, 09:06 AM   #61
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The car will actually run with ATF in the tank? Nice. I did not know that.
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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Old 11-05-2012, 09:56 AM   #62
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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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Old 11-05-2012, 10:07 AM   #63
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Personally, I would NOT want to burn ATF, gear lubricating additives in ATF are cancer-tastic.
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Old 11-05-2012, 10:10 AM   #64
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Originally Posted by phucheneh View Post
I've heard of it being IV'd into the intake as an induction cleaner, too, but that's a bit more doubtful...
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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Old 11-05-2012, 02:35 PM   #65
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Originally Posted by JCH13 View Post
Personally, I would NOT want to burn ATF, gear lubricating additives in ATF are cancer-tastic.
It's a safe bet that any petrochemical in that ATF red color is bad for you.
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Old 11-05-2012, 11:50 PM   #66
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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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