So here is the basic problem:

Take car to track. Rag it around for about 15- 20 mins.

Come off track and find dipstick has blown out by about an inch with the resultant oil discharge all over the engine bay. This never happens on the street , only at the track.

First time I thought it might be the BSH boost port blocking and increasing pressure. So I took it off. Same thing happened. Twice!

I have an OCC, Snow Performance meth kit and an Evolve decat down pipe and stage 2 tune which seems to allow peak boost at about 17. Forge silicone pipes and intercooler.

There doesn't seem to be any performance loss, just this dipstick blowing out.

Any help advice will be massively appreciated.

Jonny

P.S. I will post in other forums, so apologies if you keep reading the same cry for help.

 

Sounds like your PCV is getting blocked (either the lines to the OCC, something within the OCC, or something after the OCC) and not allowing the crankcase to vent.

I would check the fluid level of the OCC to ensure that's not a problem or better yet, remove it the next time you're there to see if it happens again.

 

Yup, PCV system issue. Try removing your entire catch can system and routing the black factory issued PCV line from the valve cover back to the intake manifold.

I'm referring to this part:
http://www.realoem.com/bmw/showparts...15&hg=11&fg=15

If the dipstick is still flying out you have a bad PCV valve in your valve cover and need to buy a whole new valve cover. PCV valve is not servicable

I would call this a serious problem for a track car since you're contaminating the entire track with motor oil. This is a huge safety issue for other drivers on track!!

 

Thanks. That's an idea. I'll try taking the OCC off entirely.

 

Something to think about before throwing another valve cover at it is to do a leak down test. I know. Scary thought. It will tell you right away if worn out rings are causing too much blowby. I really hope that isn't your problem!

 

I'll try and get that test this week. Meanwhile I'll browse the Carillo website...gulp!

In the meantime if I take off the valve cover is there a way of checking if the PCV valves are working.

 

It sounds like the immediate cause is that there is more pressure in the crankcase than the dipstick seal can cope with. That means that more gas is getting into the case than the PCV system can deal with. So either the PCV isn't pulling enough gases out of the crankcase, or there are too much gases going in.

Blow-by is probably the main reason for a larger volume of gas to be getting into the case. I'm not sure on these engines specifically, but as a general rule that is the case.

You might try a compression test; it is cheaper and easier to do than a leak-down test, and it checks the ring seal at more than just TDC. That is frequently done as a prequel to a leak-down test, with the latter serving more to confirm where the leaks are than to see if they are actually there or not. Neither test will conclusively prove there is not a problem, but if you do have low compression or large leak-down numbers you will know that Something Expensive Is Wrong.

 

I hope it's just the PCV is stuck open on the valve cover causing the boost pressure to jet right down into the crankcase.

Wow, this just really sucks

 

I hope its that too! I'll get a compression test over the weekend. If that shows any loss, a leak test. Of course I'm hoping the compression test will turn out ok and that points to the valve cover case...new case being cheaper than the alternative!

If I take off the valve cover is there any way to tell if the PVC is stuck? Blow some compressed air or something?

Anyway thanks for the replies. Fingers crossed!

 

I've only briefly looked at the underside of a N14 engine valve cover before and can't give you an exact answer. The hole on the valve is really small so i'm not sure how easy it would be to interact with it.

OK, let's sit tight and stop making you nervous

 

Did compression tests...no problems. Seems it was the Check valve in the cylinder head cover. Renewed the cover today, took the car out and immediately got the boost up to 19 Psi on the scanguage. Previous it only boosted to 17.

Yet to take it on the track where the oil disasters occur, but fingers crossed it must have been the PCV in the cover.

Thanks to all who helped diagnose and reassure! Cheers guys.