A lot of smoke
05-09-2014, 08:26 AM
#1
A lot of smoke
I have some smoking issues with my 996 C2 2002. Quite frequently I get a puff of smoke at startup. I haven't been able to figure out any pattern when the smoke comes, sometimes I just get smoke. I have replaced the AOS. Before that my car smoked even worse.
Last week I went on a slalom event (driving around cones) and one track day. On both occations my car smoked quite a lot. My car used up about one liter of oil that week. The question is, why do I get a lot of smoke? Other 996 and Boxsters at the events I attended didn't smoke at all. On these events I usually got smoke at start up, but sometimes it smoked for several minutes. Some times when I started up my engine it didn't smoke at all. It seemed quite random when I got smoke. Do I have worn out piston rings?
Should I do something about it, or just check the oil level? What is the next step? Check the compression in the cylinders?
Last week I went on a slalom event (driving around cones) and one track day. On both occations my car smoked quite a lot. My car used up about one liter of oil that week. The question is, why do I get a lot of smoke? Other 996 and Boxsters at the events I attended didn't smoke at all. On these events I usually got smoke at start up, but sometimes it smoked for several minutes. Some times when I started up my engine it didn't smoke at all. It seemed quite random when I got smoke. Do I have worn out piston rings?
Should I do something about it, or just check the oil level? What is the next step? Check the compression in the cylinders?
05-09-2014, 10:25 AM
#3
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If you're going to track the car, get a deep sump oil pan kit with internal baffles and deeper pickup tubes. The oil is sloshing around when you track and overwhelming your AOS, which in turn is sending oil into your intake manifolds creating smoke. There really is no way around this issue.
05-09-2014, 11:46 AM
#4
Rennlist Member
If you're going to track the car, get a deep sump oil pan kit with internal baffles and deeper pickup tubes. The oil is sloshing around when you track and overwhelming your AOS, which in turn is sending oil into your intake manifolds creating smoke. There really is no way around this issue.
I went with a deep sump before I started tracking my 99 and after 3 track days and over 2000 miles my car has used about a ⅓ qt of oil. I had my AOS changed about 4000 miles ago as well. My car doesn't smoke at all.
If your oil consumption is normal during regular driving that's a good sign that your cylinder scoring is minimal/non existent but that's another thing to check.
05-09-2014, 12:09 PM
#5
Last week I went on a slalom event (driving around cones) and one track day. On both occations my car smoked quite a lot. My car used up about one liter of oil that week.
If you're going to track the car, get a deep sump oil pan kit with internal baffles and deeper pickup tubes. The oil is sloshing around when you track and overwhelming your AOS, which in turn is sending oil into your intake manifolds creating smoke. There really is no way around this issue.
05-09-2014, 12:32 PM
#6
Rennlist Member
Try letting the engine run for a minute or two before you shut it down after a run. Also try keeping it one bar down from full on the oil gauge especially if you check it cold.
05-09-2014, 01:13 PM
#7
I already have a deep sump kit with X51 baffles, so that shouldn't be the problem. I also let it run idle for a few minutes before shutting it down.
During normal driving I see next to no oil consumption at all. Maybe 1/2 liter in 2500 - 3000 Km.
Robert
During normal driving I see next to no oil consumption at all. Maybe 1/2 liter in 2500 - 3000 Km.
Robert
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05-09-2014, 01:24 PM
#8
Nordschleife Master
I think your fine then.
05-09-2014, 03:53 PM
#11
Race Director
Relax.
With no other symptoms, noises, or CEL and misfires, etc., the smoking is just arising from your usage.
I dare say you probably could use some track instruction to improve your track braking technique, which I suspect is not optimum and subjecting the car and the engine to excessive g-forces under braking and in the turns. This can cause oil to collect away from the scavenge pumps. The cams whip this oil into a froth which really creates a lot of oil vapor which the AOS is not able to really deal with.
Be sure the oil is a recommended oil. You might consider switching to Mobil 1 5w-50 (not a typo for 15w-50!) oil, which is an approved oil. Under the heat and load of tracking this oil might be a better oil.
Be sure the oil is fresh. If the oil has some miles on it most certainly it is contaminated and this results in an oil that is more likely to foam, aerate, which increases the amount of oil in the crankcase fumes the AOS has to deal with.
In short, the AOS is generally not very effective -- though this varies from car to car -- so adding to its work load is not advised, if it can be avoided.
Do not run the oil level above the max line, but I would not advise you to run the level any lower than the max line when the oil level is checked with the engine fully up to temperature and on very level ground.
You want the oil level as high as allowed to ensure the engine has sufficient oil supply at all times.
With no other symptoms, noises, or CEL and misfires, etc., the smoking is just arising from your usage.
I dare say you probably could use some track instruction to improve your track braking technique, which I suspect is not optimum and subjecting the car and the engine to excessive g-forces under braking and in the turns. This can cause oil to collect away from the scavenge pumps. The cams whip this oil into a froth which really creates a lot of oil vapor which the AOS is not able to really deal with.
Be sure the oil is a recommended oil. You might consider switching to Mobil 1 5w-50 (not a typo for 15w-50!) oil, which is an approved oil. Under the heat and load of tracking this oil might be a better oil.
Be sure the oil is fresh. If the oil has some miles on it most certainly it is contaminated and this results in an oil that is more likely to foam, aerate, which increases the amount of oil in the crankcase fumes the AOS has to deal with.
In short, the AOS is generally not very effective -- though this varies from car to car -- so adding to its work load is not advised, if it can be avoided.
Do not run the oil level above the max line, but I would not advise you to run the level any lower than the max line when the oil level is checked with the engine fully up to temperature and on very level ground.
You want the oil level as high as allowed to ensure the engine has sufficient oil supply at all times.
05-09-2014, 07:04 PM
#13
Relax.
With no other symptoms, noises, or CEL and misfires, etc., the smoking is just arising from your usage.
I dare say you probably could use some track instruction to improve your track braking technique, which I suspect is not optimum and subjecting the car and the engine to excessive g-forces under braking and in the turns. This can cause oil to collect away from the scavenge pumps. The cams whip this oil into a froth which really creates a lot of oil vapor which the AOS is not able to really deal with.
Be sure the oil is a recommended oil. You might consider switching to Mobil 1 5w-50 (not a typo for 15w-50!) oil, which is an approved oil. Under the heat and load of tracking this oil might be a better oil.
Be sure the oil is fresh. If the oil has some miles on it most certainly it is contaminated and this results in an oil that is more likely to foam, aerate, which increases the amount of oil in the crankcase fumes the AOS has to deal with.
In short, the AOS is generally not very effective -- though this varies from car to car -- so adding to its work load is not advised, if it can be avoided.
Do not run the oil level above the max line, but I would not advise you to run the level any lower than the max line when the oil level is checked with the engine fully up to temperature and on very level ground.
You want the oil level as high as allowed to ensure the engine has sufficient oil supply at all times.
With no other symptoms, noises, or CEL and misfires, etc., the smoking is just arising from your usage.
I dare say you probably could use some track instruction to improve your track braking technique, which I suspect is not optimum and subjecting the car and the engine to excessive g-forces under braking and in the turns. This can cause oil to collect away from the scavenge pumps. The cams whip this oil into a froth which really creates a lot of oil vapor which the AOS is not able to really deal with.
Be sure the oil is a recommended oil. You might consider switching to Mobil 1 5w-50 (not a typo for 15w-50!) oil, which is an approved oil. Under the heat and load of tracking this oil might be a better oil.
Be sure the oil is fresh. If the oil has some miles on it most certainly it is contaminated and this results in an oil that is more likely to foam, aerate, which increases the amount of oil in the crankcase fumes the AOS has to deal with.
In short, the AOS is generally not very effective -- though this varies from car to car -- so adding to its work load is not advised, if it can be avoided.
Do not run the oil level above the max line, but I would not advise you to run the level any lower than the max line when the oil level is checked with the engine fully up to temperature and on very level ground.
You want the oil level as high as allowed to ensure the engine has sufficient oil supply at all times.
I don't know if my breaking is worse than everybody elses at the track, but I am sure I can improve. I cannot really understand why/how my car is different than everybody elses in this respect but maybe you are right. If it is the AOS it shouldn't be any problem I guess, but I think it is strange that I get so much more smoke than everybody else. It was a bit funny at the track day last week. Some of the security people came running to my car when it started smoking. They thought I was completely ruining my engine...
Robert