Oil Smoke - Input

[gtcollins@maxnet.co.nz]

I had the left catalytic converter go on my 1990 #0308 you say it's on the right side when my cat went it made the exhaust white the left bank often had a white to gray look to it compared to the right side well before the big white out in hindsight this was the cat just starting to go bad did noy know enough about the cars then had a steep learning curve after that.
Justs a thought l wonder if the headers are making more vacuum in the exhaust port and pulling the oil down the guide dose the oil smoke clear after you drive of my car can blue smoke when I decel hard thought the gears you see the oil smoke in the rear view mirror once the smoke clears from the decel you don't see it again the engine doesn't use alot of oil I think the reason the oil smoke can take a few seconds to clean is that it's in the exhaust port and exhaust not always in the combustion chamber so once back on the gas the oil burns of I need to put my gopro back there and film it to see if the engine smoke under hard acceleration just an idea hope this can help put your mind at ease I will be rebuilding #308 engine soon as I would like to put it back in the car as the engine in the car is #3026 and was rebuilt and dynoed and shipped to NZ by Doug Rippy back in 1995 It was never run till I got it going in 2017


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[Ccmano]

Interesting thought. This did not happen immediately when the headers were installed. At first everything was normal. I probably put 700 or so miles on the car with the headers before this started about 3 weeks ago. If the MMO treatment doesn’t work I will check the IH gasket and will pull the right cam cover to check for obstructions. Failing that or some other as yet unknown issue, it tear down time.
H


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[gtcollins@maxnet.co.nz]

I would also do a leak down test as well as a compression test another idea is if you think the ring are carbon up you could run diesel engine oil in it as it has detergent in it and will clean out carbon I ran it in my wife's car when it had noises hydraulic lifters fix the noise lifters

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[gtcollins@maxnet.co.nz]

Also all the cleaning products could have washed out the carbon that was helping seal up the engine if I put diesel oil in gas to clean them up sometime it will ruin the engine as it wash a the carbon but they are not that good anyway if fail after that I haven't had 1 fail yet

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[Ccmano]

A leak down test is also in the schedule for this weekend. If it turns out to be an oil ring I suspect my aggressive decarbonizing may have contributed. The Marvel Mystery Oil has the same affect as diesel. It’s in all the cylinders as we speak, soaking. I may add the remaining half quart to the fuel as an added precaution.
H

[gtcollins@maxnet.co.nz]

Hi I don't use diesel I use diesel engine oil that is petrol engine rated it has a higher detergent percentage level than petrol oils and this keeps the engine clean can sometimes help l don't run this in my LT5

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[gtcollins@maxnet.co.nz]

Hi all I brought a gopro awhile ago haven't used it before I thought I would check out the exhaust smoking on decel and I found that there was none I have seen some big clouds of blue smoke from in the car at times and when I think back about it the smoke has been after I have had extended times of quite driving my engine was overhauled by Doug Rippy back in 1995 and it was dynoed then as well it was not run till I got it going in November 2017 so I suppose I am still running it in I have done just over 4000 miles since getting it going again have been having awesome time driving my ZR-1 and after last night I feel even better about it here is a clip from the video I pushed the loop button on the gopro and didn't get much video but will get the general idea of situations if you like I will make some more videos here's the video let me know what you think

Regards Glen Collins
https://youtu.be/vsdywrkycwc

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[gtcollins@maxnet.co.nz]

Hi again if you copy and paste the link it should work

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[jss06c6]

Hans,

What's the verdict after the MM oil treatment?

Steve

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[Ccmano]

Originally Posted by jss06c6

Hans,

What's the verdict after the MM oil treatment?

Steve

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Steve,

After putting my back out early last week (getting out of bed...lol) I ended up leaving the MMO in the cylinders till Sunday. Feeling somewhat better Sunday I cleared the remaining (surprisingly) oil out of the cylinders and buttoned her back up. Started her up and commenced the mosquito fogging. After warming up I took her out for a short drive. We at least had weather in the 40’s. Did have a good chance to blow out the oil and loosened carbon. By the time I got home the smoke had cleared.

Since I didn’t have a chance to do an extended drive I will say I am cautiously optimistic. By the time I got home I was unable to reproduce the smoking I referred to earlier. Reving the engine from idle no longer produced the smoke I had previously seen.

I’m hoping to get out for a longer drive tomorrow. If this holds up it would appear that a stuck oil ring was cleared. At this point I’m not prepared to go that far.

I’ll report back after some further testing.
H