CCV delete. Anyone do it?

In my experience, increased crankcase pressure can be due to worn piston rings allowing blow-by into the crankcase, but it would have to be terrible to blow the dipstick out! Agree that it's more likely to be the omission of a one way valve that's allowing excess pressure from a forced induction system to enter the engine case :thumbsup:
Rob
 
Chris_D said:
So there's a school of thought which believes that getting rid of the ccv system in it's entirety has some credibility.
It's fairly well-documented with regards to how to actually bypass it- downtube from cam cover to a catch can etc, but has anyone here actually done it and reapd the benefits?
Click to expand...

I run an E46 325ti (M54B25) as my daily driver and swapped my CCV for a catch can at the end of last year. If you're not having problems with excessive oil consumption then I would stick with the stock/winter CCV. I was getting through almost a litre of oil a week, with blue smoke on full throttle and when first starting the car from cold. I fitted a brand new CCv with new pipework which made no difference, but the instant I changed to a catch can containing media (metal pot scourers!) with PCV valve to regulate pressure the oil consumption went away (1/2 a litre in 6 months).
Emissions were excellent at the last MOT. :driving:
 
Fishy Dave said:
Chris_D said:
So there's a school of thought which believes that getting rid of the ccv system in it's entirety has some credibility.
It's fairly well-documented with regards to how to actually bypass it- downtube from cam cover to a catch can etc, but has anyone here actually done it and reapd the benefits?
Click to expand...

I run an E46 325ti (M54B25) as my daily driver and swapped my CCV for a catch can at the end of last year. If you're not having problems with excessive oil consumption then I would stick with the stock/winter CCV. I was getting through almost a litre of oil a week, with blue smoke on full throttle and when first starting the car from cold. I fitted a brand new CCv with new pipework which made no difference, but the instant I changed to a catch can containing media (metal pot scourers!) with PCV valve to regulate pressure the oil consumption went away (1/2 a litre in 6 months).
Emissions were excellent at the last MOT. :driving:
Click to expand...
Ur definitely an alumni of that school of thought then :thumbsup:
However, i finished installing new CCV system today. See how it goes....
 
The car I had blowing out the dipstick with a catchtank was the Carb Turbo Lotus Esprit . The emission pipe was from memory a large one - something like 20mm. So probably not relevant to the Zed that the diameter of the catchtank was about 10mm ie half the size. A bit of a digression so sorry for that.
 
When CCV valves fail.
This little tear in the diaphragm was all that was needed to give me the roughest of all rough idles. Bonkers.
Photo 27-10-2016 12 43 24.jpg
 
As far as I know the n52 engined cars don't have that diaphragm, but instead use a cyclonic type pot where the vapour condenses & drips back into the sump or (annoyingly) gets sucked into the inlet manifold to get burnt up in the combustion chambers :(
Rob
 
n52 also has that diaphram, but its not the same part (so it may last longer).
sometimes a mod is done with an e39 oil seperator that has just the cyclone pot, but maybe you do need some kind of valve to the dipstick outlet to prevent suction from the sump back up. I dont know if theres any chance of happening.

And you can always fit a cyclone seperator from another car/brand of course. BMW is not the only one to fit those :wink:
 
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