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  #321  
Old 02-25-2021, 07:57 PM
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Quote:
Originally Posted by 80stech View Post
If you have more flow because of blow-by and/or air leaking into the crankcase (eg. rear main seal) and you don't have the baffling to keep up, then you have more oil going with it and probably a check engine light. Like I said before, people don't realize how much luck there is involved in having this work. Most of this thread is a lot of BS.
No check engine light so far. Definitely running higher crankcase vacuum.
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  #322  
Old 02-25-2021, 07:59 PM
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Quote:
Originally Posted by oldskewel View Post
Have you had a California smog check with modifications like that showing yet? Any concerns or plans for when it is next needed?
Not yet. I think I'm due in May. If I get called on it I'll reinstall the stock system. As far as I can tell this mod (minus a catch can) doesn't really work as advertised.
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  #323  
Old 03-03-2021, 01:47 PM
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Quote:
Originally Posted by Fifty150hs View Post
Here's some pics. Sorry it took so long. Have been chasing some other problems on my truck. Finally got a chance to get some. My latest oil consumption has been quite good compared to how it was. There is a caveat however. Since my last oil change I've been doing about 95% around town driving with a little freeway. This normally results in lower oil usage on its own. Because of that I don't consider this a total validation of this mod. It is a very good sign though.

I'm about 500 miles from my 5000 mile oil change being due and I have only used 1 liter of oil. I've never had oil usage that low. Having the catch can allows me to recover oil that normally would have been burned, even with the PCV mod. Since the original mod doesn't call for a catch can I don't see how it really cuts down on oil consumption. I can say without a doubt putting a catch can in the system does.
thanks for the pictures, i am running the conventional CVV set up for now .
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  #324  
Old 03-03-2021, 01:50 PM
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Quote:
Originally Posted by Fifty150hs View Post
No check engine light so far. Definitely running higher crankcase vacuum.
still running high vacumm despite the catch can? The High vacuum was the reason why this MOD worked IIRC, ,,
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  #325  
Old 03-03-2021, 02:20 PM
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Quote:
Originally Posted by docnabimmer View Post
still running high vacumm despite the catch can? The High vacuum was the reason why this MOD worked IIRC, ,,
Yep. I haven't put a gauge on it, but it's definitely significantly higher than the CCV. It's now running in psi range. The CCV runs a vacuum in inches of water column. The high vacuum probably helps with gasket or seal leaks maybe? I don't see how it would help otherwise. From what I'm seeing with the catch can, without it, that oil would be going right back into the intake and getting burned off. Not really cutting oil consumption.

I also can't really give a true assessment of the effectiveness. I went about 7500 to 8000 miles after the change with my normal driving at the time which included freeway driving. I then changed jobs and now have a very short commute and have been doing very little freeway driving. My consumption went way down. But, doing some reading on NewTis I found that oil consumption going down would be expected with around town driving vs freeway driving. When I was doing my previous driving my consumption went down very little with the mod. So, like I said before, I'm not sold on this mod actually working.

I have to get smoged in the next month to renew my registration. We'll see if they call me on it. If they do, I'll be back to the stock system. Then we can see what happens with oil consumption with mostly around town driving. Interesting experiment.
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  #326  
Old 04-15-2021, 05:14 AM
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Quote:
Originally Posted by docnabimmer View Post
Thank you Xelo for your input.
I know you have doubts about this MOD since 2019 (post #253,) did you actually do the MOD and the corrections you suggested, what were the results if you dont mind sharing?
and would you change to the PCV1124DL before measuring the vacuum. We dont use the FRAM 345.
And if indeed there is a a reduction in vacuum, would connecting the F connector to one of the rear unused ports at the back of the intake manifold be as effective?(this is the port that is used by the O2 Pilot Mod)
thank you

No, PCV1124DL is too restrictive for the volume of airflow needed. You need to keep *at least* the diameter of the OE hoses for the blowby to be properly evacuated. Fram PCV meets the exact size of OE hoses (16mm) and is already used in engines with a displacement much larger than M54, so there are no worries regarding flow of gasses.


Secondly, you need to vent the crankcase, not the intake. Connecting F to back of intake (02pilot port) is senseless, that will make the vacuum past TB suck air after MAF, increasing the amount measured by MAF and increasing mixture adaptations.
F port is already connected to the intake by the hoses merging to brake booster.


Third, I indeed had this CCV-to-PCV modification done, as presented in previously posts. Kept OE hose size all over, exiting VC with 19mm to catch can, then 16mm from CC to Fram PCV and continuing with 16mm to vacuum distributor above intake keeping all original ports for proper distribution of vacuum to all cylinders. Kept original hose plugs for look and proper sealing.




Capped vaccum port at the back of the intake.



Then connected the F port to the oil dipstick old CCV port, but installed a one way valve between (not letting the oil being sucked into intake if something backfires; crankcase sucks filtered and *already measured* air from the intake elbow).


Car runs great, fuel trims at max +/- 2-3%, baffled catch can does its job, not able to make a definitive oil consumption assesment as not moved much on highways with these COVID restrictions.




Pics:
https://postimg.cc/PL2Ktg3x
https://postimg.cc/d7v6wrqF
https://postimg.cc/JGDPqRTf
https://postimg.cc/bs7LV4Ws
https://postimg.cc/sBVFqvSj
https://postimg.cc/NK8qd1KC
https://postimg.cc/CRppCvxf
https://postimg.cc/GBWSWqbw
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  #327  
Old 05-16-2021, 08:54 AM
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Things fell apart, but....

I did this mod about a year ago (exactly following the original post) and then recently started throwing P0171 and P0174 codes and she was running like crap. I built my own DIY smoke tester and fired her up and quickly found I had a good leak there I should have had a cap per this original instruction:

"After that you have to plug the port on the opposite end of the air distribution piece, I found a red plastic cap that fit in very tight."

I didn't have anything I could find that would fit great so I had cobbled something together and it had come loose causing this issue.

Well, long story short I found that the following product fit very well for this application: Dorman rubber expansion plug #02608. I bought it at O'Reilly an it was around $4.00. You should be able to search this and find it about anywhere that sells auto parts. There is a small nut on there you tighten. I am highly confident this will never come loose and I am impressed how smooth things are running now compared to what I was used to.

Good luck all!
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  #328  
Old 05-17-2021, 09:29 AM
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I’m not sure if this was mentioned before (used search and nothing came up), the m56 engine from a sulev e46 has a valve cover that will fit the m54/m52tu engines and the valve cover is aluminium with an inbuilt ccv. Thereby eliminating the need for the stupid ccv system under the intake manifold.

The only issue is that the VC is only available in the US (available from eBay for about ~$250) and some modification is required; ignition coils change to the push in ones, (IIRC 2001 - 2003 X5 models have the bolt in ignition coils) this requires a change to the push in coil harness.
And the ccv diaphragm + cap is somewhat difficult to find. There is a huge thread on another forum where someone made an aluminium cap which works fantastic.
Also, the dipstick tube needs to be capped off and the plumbing for the vacuum lines from the intake manifold to the VC needs to be changed.

All easy work though.

It’s mostly a straight swap and the gain is amazing. I’ve been running my m54b25 with the m56 valve cover for over a year now with no issues or headaches.

Here is a photo of it;
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  #329  
Old 05-17-2021, 09:51 AM
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This was something I had considered when I bought my X. Catch cans are great, I've had them on other cars, but this would be a maintenance-free solution. I still may end up trying this someday.



Were there any twists in the project, anything that didn't go as expected, or any hidden costs?
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  #330  
Old 05-17-2021, 10:20 AM
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Quote:
Originally Posted by Bdc101 View Post
This was something I had considered when I bought my X. Catch cans are great, I've had them on other cars, but this would be a maintenance-free solution. I still may end up trying this someday.



Were there any twists in the project, anything that didn't go as expected, or any hidden costs?

The only real big problem was my diaphragm was buggered and I had to find a different solution, the only one I found at the time, was a Russian made one on eBay, but taking that ccv cap off was also impossible without breaking the tabs, and replacement for the cap was not available at that time. Now it is!

I would recommend getting the aluminium cap and Russian diaphragm with the VC before replacing the VC, also if you reside in US, go to a pick n pull to get the VC, I found one (after 4 months of searching) and got the whole kit for $100 (VC, 2 sets of coils, harness, dipstick tube, gaskets and VC vacuum hose)

You can find the cap if you google m56 valve cover on m54 on a forum. (I don’t want to link it because I don’t know the policies here yet).

The other issue I experienced was that my VC studs (screwed into the head) were stretched, and the VC was not sealing correctly, so oil was dripping on the exhaust, so I ordered new head studs and replaced them, and now it is sealing good. I didn’t read anyone else having this issue.

Definitely get new VC gaskets and grommets (for the nuts)!!!
The m56 VC gasket and spark hole gasket is different from the plastic VC, it’s flat, it’s also metal covered in rubber. The grommets are the same.

The last bit was the vacuum hose plumbing, what I did, I left the thin tube running along the intake manifold, I removed the hose off of the fitting for the intake splitter, added 3” long vacuum hose ran it through where the original ccv hose went, added a 90° fitting at the end, then ran another 3” vacuum hose from the VC to the 90° fitting, this makes it look OEM and functions perfectly. If you run the hosing without the 90°, the hose will kink and will cause issues (no air flow).
Hose is 5/8th ID, none collapsible silicone.
The 90° fitting is 5/8ths brass barb.

I forgot to mention in my previous list of items, get the VC to intake manifold hose, you will need the quick connect for the VC, it is different from the composite plastic VC. (In the top left corner of the picture below).

The below shows all the prices I needed, I did not replace my dipstick tube, I just capped off the return feed for the original CCV system. Also, the harness will not need to be changed if you have the push in coils, I just transferred. The clips that hold the harness over (the tiny silver clip on the vc below).



Separate notes; the three clips next to the spark hole gasket, lower right, those go onto the VC lip on the right, they hold the O2 sensor cables.

I can take photos of my install if anyone wants.

Sorry about the long post but I’m adding literally everything tiny thing I did to make it as OEM as I could, fit, finish and function.
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