Smoking when warm...

[poxxxy]

So... the car is smoking when warm... unsure why exactly but I have attached a video... Start of the video shows it cold running no smoke... progressively getting worse as the car warmed up... head gasket looks ok after stripping it all down (had head skimmed when getting the vehicle as it was a non runner - compression is pretty high but runs ok)... and the valve stem seals should be ok to...

[youtube]http://www.youtube.com/watch?v=Rjol_4Cad0Y[/youtube]

The bores on the block look and feel totally unscored... but perhaps rings could be the issue?

Any opinions appreciated on what it could be and what to do next... may just put the cc700 head on and see what happens but don't want to waste another head gasket!

which of the valves stem seals should I be looking at? I did buy an engine gasket kit from fischer 500, which appears to have 2 included....

[Gadge]

Although you said valve stem seals should be ok I'm thinking that maybe they are the cause. The reason I say is because oil thins as it gets warm and as the engine runs it could work its way past the seals. I think if the rings were at fault it would do it almost instantly.

[baron_matt]

One easy way to see if it is stem seals is to see if it smokes on the overrun, going down hill throttle closed engine braking will suck oil past the stem seals if they are badly worn.

If it smokes under load then its deffo worn piston rings.

[poxxxy]

Sorted the youtube link so you can see the situation... Started stripping the original (skimmed) cylinder head today and removed some studs to swap over into the CC700 head... On removal of one of the valve springs which seemed seated a little funny... and removing the valve from the seal it was immediately destroyed as a small layer broke away... I can only see 2 of the valve stem oil seals on the inlet valves... are the exhaust missing on both heads or am I being stupid?

Most valve steam seal issues i've seen on the internet seem to be when cold rather than warm to.

BTW breather is clean while the exhausts smoking away.

[126_bis]

This is going to be of no help in a way but my mini done exactly the same,  when it's on run down it got worse in that video. I was told it's either piston rings or valve stem seals as the oil thins out when warm and gets between the gaps easier. I changed both while I had the engine apart. Done the trick. Hope you get it sorted. Mine was pumping light black smoke this morning after a carb rebuild, took  it for an hours quick drive and seems to have sorted it's self.  Bloody BIS ay lol we are all having problems

[Gadge]

Yeah there's just two on the BIS both on the inlets

[poxxxy]

Trying to compress the spring on the cc700 head and omg they are tough! Not sure whats going on... managed to use my valve spring compressor on the bis head just about... but still not as its meant to be... but this CC700 head... they do not want to budge much at all!