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I'm smoking, help me!
Ok, it is actually my 74 911 that is smoking. And especially under full throttle. I know your first thought- compression test. Well I did and got about 118-120 on all six. I can run the car for an hour and if i hold the rpms down nothing happens. but if i start to get on it as you should, it starts to smoke. I've cleaned the engine and run it again and the drivers side bank is wet between the cylinder and the block along with the heat exchanger and the muffler and...everything from the middle cylinder back. Hence ( I think ) the smoke. But where is it from? any tips on where to start looking?
Valve covers are ok- i know I have a tiny leak on that side, but it is not the cause of this as it is dry in between and no splash back behind. Oil return tub? maybe but it doesn't drip at night. What has pressure under load there? Cylinder to block surface? possible... Any other thoughts? people always have different ways of looking at problems on here, let me hear some! |
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09-27-2009, 03:31 PM
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Free minder
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1. Is the smoke coming from the tailpipe?
2. Did you by any chance overfill the oil? That makes em smoke... 4. How much oil does it use? 5. What color is the smoke? blue=oil, white=water 6. Compression test is not enough. You need leakdown test to tell if the valve guides are worn.
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1978 SC Targa, DC15 cams, 9.3:1 cr, backdated heat, sport exhaust https://1978sctarga.car.blog/ 2014 Cayenne platinum edition 2008 Benz C300 (wife’s) 2010 Honda Civic LX (daughter’s) |
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09-27-2009, 07:11 PM
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Join Date: Apr 2009
Location: Cape Vincent, NY
Posts: 841
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If you mean wet with oil then you should start by finding out exactly where it comes from. A simple luminosity kit (oil dye and IR light with glasses) will let you know. If it is from the cylinder to block interface then it is either bad shim/gaskets there or loose cylinders. There is pressure there when the piston is going down it's stroke.
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1968 911S "Leona" Air goes in and out, blood goes round and round, any variation on this is a bad thing. |
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09-27-2009, 09:16 PM
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Thanks for the ideas. I believe that the smoke comes from the outside of the exhaust as both the heat exchanger and muffler are coated in oil on the drivers side. If I wash it off then drive hard are they both wet again afterwords. I can try the dye if i can find it ( live in europe ). Aurel by water you mean condensation or ? -as far as I know a 911 doesn't have water in it :-) .
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09-28-2009, 02:20 PM
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Yes, I meant condensation. Have you checked your headstuds? If a few are broken, oil can be leaking from the base of the cylinders and the cylinder-head seals, directy on the heat exchangers. Next possible culprit are the oil return tubes.
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1978 SC Targa, DC15 cams, 9.3:1 cr, backdated heat, sport exhaust https://1978sctarga.car.blog/ 2014 Cayenne platinum edition 2008 Benz C300 (wife’s) 2010 Honda Civic LX (daughter’s) |
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09-28-2009, 02:35 PM
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Head studs are my worst fear. But it seems like it might be so. I have checked the oil return tubes and while the one there is not in new condition, it is dry on block/head/middle. looks like i'll be taking off the valve covers...
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09-28-2009, 02:56 PM
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