Can't remember were I left this, so here's an update. I did all the valve seals using one of those head-on-block tools with the magnetic chamber. Worked VERY well. I did then entire head in less than five hours and a lot of that time was spent creating a technique that worked for me. Anyway- nothing changed. Still starts smoking right around 12 seconds after starting up cold. Takes another minute for that smoke to diminish and will still smoke under heavy load/rpm until warm. When warm it will smoke a little under high rpm - ~7k. I did a hot compression test just to verify compression rings and got 197-188-196-192. So number 2 was down and the rest up, but all very similar. I looked in the plug holes after sitting all night and noticed that number 2 is the only piston that is wet on top. That said, I don't think that's the oil causing all the smoke at startup- which is why there's a delay. I think that oil is what is typically burning when warm. My best guess is this: there's a bad (stuck or broken) oil ring at number 2. On cold start there's a lot of oil coming into the cylinder past a cold compression ring BUT as that compression warms up it starts to manage the oil, controlling the amount slipping into the combustion chamber and therefore reducing the smoke. Plausible?
> > > On Nov 8, 2009, at 12:44 PM, Bill Cardell wrote: > >> Remember, a compression test tells you essentially nothing about oil >> consumption, same thing with leakdown. You could have totally hosed >> oil >> rings, which would give you great compression (essentially always a >> wet >> test). I'm not buying oil past the outside of the guide. How about >> baffles in the valve cover? Is there oil in the intake manifold? > _______________________________________________ Miatapower mailing list [email protected] http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower
