Hi guys. Got a problem with my cvh turbo engine in my s2. Its running p8 cosworth management with siemens injectors and hybrid t34 turbo. The bottom end has been rebuilt ( all forged internals, new rings , rods etc ) and was sent away to get set up. Ive put millers running in oil and done about 5 miles in laps on the engine round my land a few times ( not mot'd so cant use roads due to restoration ) but once the engine is warm, theres blue smoke from the exhaust. On driving, it boosts fine in second ( new engine so cant blast it ) and only able to use first 3 gears due to space. Ive removed the air filter and theres a small bit of oily residue on the compressor housing by the turbine wheel, also slightly oily in intercooler and pipe coming from there to turbo housing. Now if i boost it, it doesnt really smoke much ( not sure if its cos smoke gets blown clear as i drive ? ) . If i go down the hill and hold in the clutch pedal it wont smoke.. When i rev around 2k on spot it will blatantly smoke. Ive changed the valve stem oil seals. There is side to side play in the turbo and a little in and out play. Now can anyone help with any ideas whats causing it. Does it sound like a dead turbo ? Or oil piston rings ? Ive been told that i need to take it for a long drive to bed the oil rings in and the smoke will eventually clear ?

edit, spark plugs are black, sooted. Also, i previously had an old turbo that failed and dumped oil in to the exhaust, removed system, tried to jetwash clear.
Any help appreciated, cheers

 

id be getting that turbo inspected first, also the exhaust valve guides in the head are a good shout, my cvh smoked and it turned out to be them

 

What crankcase breather setup are you using ?

The engine should not smoke.

It would be almost impossible for oil from inside the turbo, to make it to the inducer of the turbo, although it could make its way to the discharge of the turbo.

Plugs should not be black, clearly something needs tuned correctly.

what colour/smell is the smoke ? And no, even a new engine should not smoke, other than perhaps initial burn off some components like exhaust if they've been lying or had oily hands etc on them

 

Thanks lads. Im using a bailey breather set up venting to atmosphere. The smoke was blue and defo smelt of burning oil. Ive removed the turbo today for inspection and when i removed the core from the exhaust housing, oil pissed out from where the exhaust turbine wheel is, compressor side was dry.