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stephen930's Avatar
 
Join Date: Jan 2007
Posts: 84
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Blowin Smoke?

So I recently had a mechanic re-seal the the top end of the motor due to some serious leakage. My 930 always blew out a small puff of smoke on start-up but ever since this was done, when I start her up she now blows a fairly large initial cloud of smoke.
I don't believe she is burning oil, the motor checked out when the mechanic was in there, so this started after the work was completed. I also don't see any smoke blowing after it is started up.

Any motor heads out there have any ideas about the issue? I am going to take it back to him to correct but would like to have some idea of what it might be in case he tries to tell me it is some other issue. I just worry that something may not be adjusted correctly in the motor to cause the extra smoke.
Thanks,
Stephen
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87 930 Super Cup (964) Cams , Andial K27 7200 Turbo, Andial Intercooler, Twin Plug, Andial Fuel Enrichment System, Carillo Rods, Mahle Pistons, Raceware head studs, Adjustable Turbo, Ruf Wheels, plus much more...
Old 10-12-2009, 11:51 AM
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Stephen,
Did your technician check and/or replace the valve guides when he had your engine apart?
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Old 10-12-2009, 12:28 PM
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Not that I can tell, but that doesn't mean he didn't look at them. Could that be causing some excess oil in the valves?
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87 930 Super Cup (964) Cams , Andial K27 7200 Turbo, Andial Intercooler, Twin Plug, Andial Fuel Enrichment System, Carillo Rods, Mahle Pistons, Raceware head studs, Adjustable Turbo, Ruf Wheels, plus much more...
Old 10-12-2009, 02:25 PM
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Join Date: Mar 2004
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Here are a couple of places oil can be coming from:

1. Around piston rings, both cold and hot motor. Seeping around rings on a cold motor is fairly normal for these motors and usage of a quart over about 900 miles is average (or thereabout). If you think you have high oil consumption, pull the plugs and look for black inky deposits that mean oil usage.

2. Worn valve guides will use oil and is easily seen on decel as the vacuum from the cylinders pulls oil down the valves into the combustion chamber.

3. Oil past the turbo bearing into the hot side of the turbo will use oil and show itself under full accel and moderate driving. On a cold motor start, oil in the turbine will not normally burn immediately on start to provide the blue puff of smoke - that's oil in the cylinders.

To get an idea of where the oil is really coming from, do a leak down test on each cylinder. It won't take much leak past the rings to use lots of oil.
Old 10-12-2009, 05:35 PM
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