Scary carbon build up
11-29-07, 01:14 AM
#1
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Scary carbon build up
I have never seen so much carbon build up in any engine i've ever pulled apart. It was almost 1mm thick in some spots, if not a little more.
Any idea what could cause this much build up?
Its a Turbo II engine w/ 80k on it. Running Pennzoil premix (synthetic marine stuff).
Sorry for the crappy pics.
Any idea what could cause this much build up?
Its a Turbo II engine w/ 80k on it. Running Pennzoil premix (synthetic marine stuff).
Sorry for the crappy pics.
11-29-07, 12:59 PM
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No stock oil injection is gone as I wanted to run synthetic oil since I bought it (6 months ago) and didn't want to hassle with the syn can/cant be injected and burned debate.
Switched to premix about 3 years ago.
PS I realize the timeline doesn't make sense, but I've been involved with this car for the last 5 years I'd say.
Switched to premix about 3 years ago.
PS I realize the timeline doesn't make sense, but I've been involved with this car for the last 5 years I'd say.
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11-29-07, 01:34 PM
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I generally do a lot of high way driving around 3700 RPM just under the staging point.
Its an S4 TII and I rap out the tach to redline frequently and would do a couple gear pulls for the hell of it, but it only stayed at redline as long as it took me to get there and shift
Its an S4 TII and I rap out the tach to redline frequently and would do a couple gear pulls for the hell of it, but it only stayed at redline as long as it took me to get there and shift
11-29-07, 02:16 PM
#16
do the gallon of water trick. That will "steam clean" our enigne.
http://rotaryresurrection.com/2ndgen...injection.html
http://rotaryresurrection.com/2ndgen...injection.html
Last edited by iceman4357; 11-29-07 at 02:25 PM.
11-29-07, 02:27 PM
#17
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Lol, I'm doing the "wire wheel and scraper" trick while i'm rebuilding the engine. But I just may have to start doing the h2o trick again. Maybe @ 5k miles or so just to keep her clean.
11-29-07, 03:39 PM
#18
The rings ideally wouldn't have any carbon because combustion does not occur there. What I am suggesting is that there was a small amount of oil being consumed over a long period of time from leaking past the rings... which you might have chalked up as regular OMP injection loss, or whatever.
11-29-07, 06:21 PM
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Oddly enough I was actually gaining MORE oil in my oil pan every oil change...I don't know why?
Gas in the oil? hmm....maybe you're on to something.
Gas in the oil? hmm....maybe you're on to something.
11-29-07, 07:33 PM
#21
gas leaking into the oil also means oil can leak into the combustion chamber (OMP or not). So I see 3 possible causes:
1. Cheap synthetic oil leaving deposits.
2. Cheap gas leaving deposits.
3. Not enough redlining.
If you were getting gas in the oil you would have been able to smell it during an oil change, I'd think.
1. Cheap synthetic oil leaving deposits.
2. Cheap gas leaving deposits.
3. Not enough redlining.
If you were getting gas in the oil you would have been able to smell it during an oil change, I'd think.
11-29-07, 07:45 PM
#22
Scary carbon buildup? WTF? That is completely normal. After just a few hours of runtime, a light film of carbon builds up on the rotor faces. After a couple thousand miles of normal driving you will have about that same amount. I see engines with TONS more carbon than that. This is MILD carbon, and nothing at all to worry about.
I bet the inside of your exhaust has more carbon than that, lol.
REAL carbon buildup son, let me show you it:
I bet the inside of your exhaust has more carbon than that, lol.
REAL carbon buildup son, let me show you it:
11-30-07, 12:59 AM
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gas leaking into the oil also means oil can leak into the combustion chamber (OMP or not). So I see 3 possible causes:
1. Cheap synthetic oil leaving deposits.
2. Cheap gas leaving deposits.
3. Not enough redlining.
If you were getting gas in the oil you would have been able to smell it during an oil change, I'd think.
1. Cheap synthetic oil leaving deposits.
2. Cheap gas leaving deposits.
3. Not enough redlining.
If you were getting gas in the oil you would have been able to smell it during an oil change, I'd think.
Well I use Royal Purple for oil. Sunco or Mobil 93 octane and decent red lining
Kevin, like I said, from what I've seen (5 motors pulled apart) this is the worst I've seen and by far the lowest mileage. The others were over 110K this ways 80K. Call me an amateur, but this is my experience.
PS that is some damned carbon covered motor you've got there.
Sorry for misspelling i'm fairly drunk rightnow
