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Date: Wed, 29 Mar 2006 06:01:10 GMT
From: James Sweet <jamessweetnospamail.com>
Subject: Re: Yikes!  Puff o' smoke...


Al wrote: > 1987, T16 Aero. > Coming up the motorway on Sunday I thought I noticed a "puff" of smoke from > my exhaust. The only way I could reproduce it was thus... > > 1/ Floor it and get it flying, (80mph ish in fifth gear) > 2/ Let go of the throttle and ride on the overrun for about ten seconds > 3/ Floor it again.....single puff of whitish smoke. > > At no time do I change gear or over rev the engine, I generally try to > change at no higher than 4000rpm, but sometimes go to 4500rpm. In addition > despite several attempts, I only reproduced the phenomenon once... > > She doesn't smoke under normal circumstances, and I don't get the classic > turbo smoke if I leave her standing running for a while. > > What's going on? I don't appear to be losing oil, I'm not aware of any sign > of a head gasket problem. Could this be un-burnt fuel just smoking off in > the exhaust system, i.e. nothing to worry about > > OR > > is my beloved C900 about to go pop.... > > Thanks > > Al > > > My guess is the seals in the turbo are wearing out. When you let off the gas after hard throttle you have a lot of vacuum in the intake side and the turbo is spinning fast, oil gets past the shaft seals.

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