Date: Fri, 04 Feb 2000 20:59:01 +0000
From: Bryan Palmer <>
Subject: Re: Exhaust smoke on over run..?

Thank you Johann About two weeks ago popped a piston ring. It cost me 1100 for an 'unwarranted' replacement engine (inc fitting) and then a week later, I get over run smoke. I was worried that the replacement engine had been a waste of money. I've got a few tweaks on the car and she's running very very fast indeed, so maybe the extra pressure is, as you say, leaking through a dodgy seal. The car's book in for a check over on Monday, so I'll let you know what transpires... Cheers Bryan On Fri, 04 Feb 2000 19:52:35 +0000, (John) wrote: >Dear BP >Have the same thing with my 85 900 T16 with 186k miles on the clock - it >has done it for the last 40k and not got any worse and I have not noticed >any oil consumption. I change the oil (mobil1) every 3-4k and don't see any >drop in level between changes. It's possibly a seal on the turbo >compressor side thats a bit worn - when you are in overrun the high vacuum >sucks the oil past the seal and when you hit the throttle again it pulls it >into the cylinders and burns it. It could also be the crank case vent >sucking oil through the top of the engine and into the intake. It's >probably not the rings or valve guides as I would get smoke on startup, on >every overrun and oil consumption. I would'nt worry too much unless you are >using alot of oil - the smell's a bit anoying in the summer with the roof >open though. >Anyone else had this ? > > >Johann - the optical quality solution to screen glare...

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