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#251
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- To plug existing system hoses: as long as you have some rubber material to plug any factory open hoses, it is OK. The idea is to de-commission the factory PCV system.
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1998 E39 528i 5sp MT 2006 E53 X5 3.0 6sp MT |
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#252
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#253
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Hello again,
I am planning to do this modification also (including a catch can) but after days of studying I've stumbled upon one issue that has not been adressed (or addressed too little). There are 2 versions for any PCV system: open and closed. Open ones are venting the blowby gases to atmosphere, closed ones (as in this case for the M54s) are venting the "filtered" air back into the engine through the intake manifold. Now comes problem #1: this "filtered" air is not measured . MAF measures air coming through the intake manifold, but the one coming back from the valve cover through this modification is routed back into the IM AFTER the MAF (through distribution cover) - so there is a surplus of air going to the cylinders, although the ECU has measured less and O2 sensors will measure more. This will cause crazy fuel trims. Any schematic of closed PCV system on the net is described as having a venting hose coming from the air filter (so metered air) which allows the crankcase to breath. See examples below: Returning to the case of M54 engines: OE system does not have a supplementary/aditional valve cover breather as I remember. The only port of the VC is the one going to the CCV. So this raises so many questions: 1) Why does the OE M54 CCV system does not have a breather allowing the crankcase to draw air from the intake 2) Would this breather be a good idea as it still allows vacuum but also protect engine seals ? 3) Where would the best connection for a breather be ? I have heard a case where the guy connected a hose from the vacuum F connector in the intake boot to the oil dipstick. If so, would this need a non-return valve (for the improbable case oil from the crankcase/oil pan would come up and flood the intake) ? My take on this: Last edited by Xelo; 09-18-2019 at 07:24 AM. |
#254
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Good for you for trying to think things through and you are justified having some concerns, but you have some errors in your information. One big problem is that you don't have a diagram of the factory CCCV system. A CCCV system is NOT a closed PCV system. Also, I think it would be good if you started a new thread on this.
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1988 325is (purchased new) sold 2004 X5 3.0 2005 X3 2.5 2008 X5 3.0 (new to me) Last edited by 80stech; 09-18-2019 at 11:43 AM. Reason: add |
#255
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Umm, sorry, but could you please me more specific about the errors ?
My drawing explicits exactly what you guys are talking about for some time: transforming the CCV into a PCV. |
#256
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OP - is that a clutch fan or electric fan?
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#257
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Quote:
https://www.ebay.com/itm/16-Piece-Ca...72.m2749.l2649 |
#258
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Quote:
Also, this is my first post never here. Hi all!! |
#259
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Updates anyone ? Just Replaced my M56 cover setup to this MOd today...
Thank you in advance. |
#260
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I don't know about M56 engine, but this mod on my 2006 X5 3.0i M54 has worked great.
It is about 15K miles later, zero oil consumption. Fantastic mod!
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1998 E39 528i 5sp MT 2006 E53 X5 3.0 6sp MT |
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ccv, oil separator, pcv, vacuum, ventilation |
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