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Date: Tue, 28 Mar 2006 19:29:29 +0100
From: Grunff <grunffnospam.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. My old T16 used to do this. It isn't whitish smoke, honest, it's a healthy blue/grey, burning oil type smoke. It just looks white in the mirror. > 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 You are burning oil, but a very small amount of it. It gets sucked in during overrun, builds up, then gets burnt off in one go when you floor it. There are two things that cause a T16 to do this: leaky valve stem seals and leaky turbo seals. In most cases, it's the valve stem seals. As such, I'd do them first. > is my beloved C900 about to go pop.... No, far from it. It will slowly, gradually smoke more, until you fix it. If I were you, I'd do nothing right now, and schedule the work in for next time you're doing some major work on the engine. -- Grunff

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