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blue smoke
On over run = valve guides? Happens between gear shifts - puff of smoke, and downshifts under brakes.
Any other potential source? My leak down numbers are between 93 and 98%. One at 93, rest 96-98. Thanks Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-) |
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10-04-2015, 02:51 PM
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Join Date: Oct 2006
Location: MYR S.C.
Posts: 17,321
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valve stem seals
valve guides piston rings/oil ring pull plugs and take a look at them
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86 930 94kmiles [_  _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold |
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10-05-2015, 05:55 AM
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Join Date: Sep 2009
Location: Norway
Posts: 508
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I had blue smoke on acceleration. Opened her up, changed valve stem on one cylinder, then closed her up. All was good after that. Yours is on decel and downshifts. Not sure if that will be stems.
Here`s the cylinder in question when i removed the headers. Good one to compare. http://i.imgur.com/V3WZEaj.jpg http://i.imgur.com/Ss6hEQv.jpg
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Gone! Last edited by Oheggem; 10-05-2015 at 08:51 AM.. |
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10-05-2015, 08:48 AM
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I had issues with the valve seals when installing. Some of them didn't seem to snug tight - I could pull them off again after pushing them on. I was a bit scared to wack them too hard. The heads were 2nd hand ones I purchased and ported, but the valves/guides seemed in better condition than what I was running. The leakdowns I think are OK - new rings. One cyl may not have bedded in completely. Had another at 93% that has come up to 98 with last track run. I'm thinking valve area on over run, rather than rings?
Regards Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-) |
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10-05-2015, 11:34 AM
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