Does shooting flames of this size burn/decrease oil? (video)

Xx__xs · 11-06-2015, 03:09 PM

....................

BzsBimmer · 11-06-2015, 03:35 PM

Aren't backfires the symptom of excess fuel in the exhaust stream, whether intentional or accidental?

The video looks to be intentional fuel dumps to create the flames.

I'd look at other reasons for oil loss. Some cars just burn up a lot of oil due to piston ring wear/tolerances, oil type, internal leaks, external leaks.

Oil typically is not ignitable like what you see in the video. Typically oil will smoke/burn in lieu of being combustible.

Xx__xs · 11-06-2015, 04:00 PM

Quote:

Originally Posted by BzsBimmer

Aren't backfires the symptom of excess fuel in the exhaust stream, whether intentional or accidental?

The video looks to be intentional fuel dumps to create the flames.

I'd look at other reasons for oil loss. Some cars just burn up a lot of oil due to piston ring wear/tolerances, oil type, internal leaks, external leaks.

Oil typically is not ignitable like what you see in the video. Typically oil will smoke/burn in lieu of being combustible.

While I didnt get it on video, (ill try later) my car sometimes does emit darker smoke through the exhaust immediately before a flame shoots out or at the same time you hear a loud backfire/ right as I shift into next gear

I have a light oil leak out of the oil gasket area.

When I just got the car (about 5 years ago) the stock 4.0 engine was burning about a quart every month or so. this was deemed normal by anyone I talked to. Now with the 4.6, this (albeit minor) leak, and flume of smoke/fire during hardish WOT's, Im at a quart every half month or so.

I'm going to attempt a solid month without any very hard WOT's to see if it solves the issue,

stevelp99 · 11-06-2015, 05:42 PM

Yup, check for leaks. My old Mustang GT used to consume oil as much as fuel even though it did not have a single leak, compared to my old old M5 used to consume oil more so than my M6 at the time. Both had the same engine, roughly the same amount of miles, no leaks or problems, Just one consumed more oil than the other. Flames are due to excessive fuel. My GTR used to spit flames when running E85 when letting off the gas in high rpm.

Flying Ace · 11-07-2015, 12:07 AM

Are you cat less?

Xx__xs · 11-07-2015, 01:37 AM

Quote:

Originally Posted by Flying Ace

Are you cat less?

yes.

and ya in the vid i let off the gas at maybe 6.5-7

Kwike92M3 · 11-07-2015, 06:22 PM

To address your question: No.
Excessive oil consumption is typically attributed to PCV malfunction, improper piston ring seating/excessive wear, etc. It WILL NOT cause flames out of the tailpipe. The black or dark smoke you are seeing is typically a sign of a rich fuel mixture. If the smoke was a light grey, which is most often more prevalent @ idle RPM ranges, then that could be cause for questioning. Some oil consumption is very normal, especially for german cars. For example, Audi 2.0L turbos can consume .5L per 500 miles, and still be considered "within tolerance"

Correct me if I'm wrong (which I usually am) but flames out of the exhaust, especially during deloading of the engine (coming off of WOT, down shifting, etc) is usually caused by valve lift/open duration combined with a rich A/F mixture. If the car is tuned to have exceptionally long valve lift duration, the unburnt fuel from a rich AF mixture can make it into the exhaust and combust. If you have cats, their life span will be greatly decreased as this results in very high catalyst temps.

Again, this is really only ever found in high performance applications. If you are worried, consult a trained technician.

ruff1017 · 11-08-2015, 06:35 AM

I do not know about the flames. But just give you an idea, I have 2009 (stock btw) and it does not burn any oil at all. I never had to put any extra oil between the oil changes.
And I don't drive slowly.
For sure, its not normal with that much oil consumption.

11-06-2015, 03:09 PM	#1
Xx__xs Major 201 Rep 1,255 Posts Drives: m6 Join Date: Jun 2010 Location: los angeles iTrader: (1)	............. .................... Last edited by Xx__xs; 10-20-2018 at 02:46 PM..
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11-06-2015, 03:35 PM	#2
BzsBimmer Major General 3274 Rep 6,723 Posts Drives: '23 G80 FO M3, M3 & MY Tezzy's Join Date: Mar 2006 Location: Nor. Cal iTrader: (32)	Aren't backfires the symptom of excess fuel in the exhaust stream, whether intentional or accidental? The video looks to be intentional fuel dumps to create the flames. I'd look at other reasons for oil loss. Some cars just burn up a lot of oil due to piston ring wear/tolerances, oil type, internal leaks, external leaks. Oil typically is not ignitable like what you see in the video. Typically oil will smoke/burn in lieu of being combustible.
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11-06-2015, 05:42 PM	#4
stevelp99 Private 24 Rep 79 Posts Drives: BMW Join Date: Apr 2012 Location: Tx iTrader: (0)	Yup, check for leaks. My old Mustang GT used to consume oil as much as fuel even though it did not have a single leak, compared to my old old M5 used to consume oil more so than my M6 at the time. Both had the same engine, roughly the same amount of miles, no leaks or problems, Just one consumed more oil than the other. Flames are due to excessive fuel. My GTR used to spit flames when running E85 when letting off the gas in high rpm.
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11-07-2015, 12:07 AM	#5
Flying Ace Lieutenant General 4985 Rep 11,891 Posts Drives: G05 45e, 997.1 & 991.1 GT3s Join Date: Jul 2014 Location: SF, CA iTrader: (5)	Are you cat less?
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11-07-2015, 06:22 PM	#7
Kwike92M3 Private First Class 74 Rep 146 Posts Drives: 2011 E92 M3 Supercharged Join Date: Aug 2014 Location: Dallas iTrader: (2)	To address your question: No. Excessive oil consumption is typically attributed to PCV malfunction, improper piston ring seating/excessive wear, etc. It WILL NOT cause flames out of the tailpipe. The black or dark smoke you are seeing is typically a sign of a rich fuel mixture. If the smoke was a light grey, which is most often more prevalent @ idle RPM ranges, then that could be cause for questioning. Some oil consumption is very normal, especially for german cars. For example, Audi 2.0L turbos can consume .5L per 500 miles, and still be considered "within tolerance" Correct me if I'm wrong (which I usually am) but flames out of the exhaust, especially during deloading of the engine (coming off of WOT, down shifting, etc) is usually caused by valve lift/open duration combined with a rich A/F mixture. If the car is tuned to have exceptionally long valve lift duration, the unburnt fuel from a rich AF mixture can make it into the exhaust and combust. If you have cats, their life span will be greatly decreased as this results in very high catalyst temps. Again, this is really only ever found in high performance applications. If you are worried, consult a trained technician.
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11-08-2015, 06:35 AM	#8
ruff1017 Private First Class 27 Rep 113 Posts Drives: 09 M3 6speed Join Date: Sep 2009 Location: Toronto iTrader: (0)	I do not know about the flames. But just give you an idea, I have 2009 (stock btw) and it does not burn any oil at all. I never had to put any extra oil between the oil changes. And I don't drive slowly. For sure, its not normal with that much oil consumption.
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