PCV oil catch can, intake sludge
Cadillac
 

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds / (Old System)

Cadillac Technical Archive | Cadillac Dealers | Cadillac Reviews | Cadillac Dealer Reviews | Cadillac Vendors

CadillacForums.com is the premier Cadillac Forum on the internet. Registered Users do not see the above ads.
+ Reply to Thread
Page 1 of 2 1 2 LastLast
Results 1 to 15 of 21
Northstar Engines and System Technical Discussion Discussion, PCV oil catch can, intake sludge in Cadillac Engine Technical Discussion; Upon inspection of the TB, I noticed the inside of the intake manifold is full of oily sludge residue. It ...
  1. #1
    cmobile is offline Cadillac Owners Member
    Automobile(s): 1999 DeVille
    Join Date
    Mar 2010
    Location
    Colorado Springs, CO
    Posts
    14

    Question PCV oil catch can, intake sludge

    Upon inspection of the TB, I noticed the inside of the intake manifold is full of oily sludge residue. It lines the walls. Knowing that the N* consumes oil, I wonder how much is being drawn in from the crankcase, PCV system.

    Back in the day we used to use crankcase oil catch cans. I wonder if it would be okay to use on the N* engine.

    Here is a link describing what they are and what they do.
    http://www.southerncarparts.com/corv...tch-p-385.html

    I built my own for my service van out of a canning jar and some fittings from Home Depot for about $10. Doesn't look as pretty as the $100 though.

    Would the lack of oil fumes hurt anything? Essentially the oil fumes are being condensed in the can but the air can still flow into the intake manifold.
    Any suggestions would be appreciated. You just empty the container when half full. (recycle it of course, but not back into your engine)

    Thanks

    ~C

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
    Automobile(s): 2002.5 F55 STS/65500mi, 2004 Ford F150 SuperCab4x4
    Join Date
    Feb 2006
    Location
    MD Eastern Shore - Kent Island
    Age
    74
    Posts
    45,006

    Re: PCV oil catch can, intake sludge

    If you can come up with a place to mount one, there's no reason not to experiment. The 2001 (?)+ engines use a fixed orifice and that doesn't seem to suffer from quite as much oil carryover in the PCV system as the rattle valve types.

    Keep your airflow as close to stock as possible because that PCV is calculated into MAF and fuel/air ratios.

  4. #3
    cmobile is offline Cadillac Owners Member
    Automobile(s): 1999 DeVille
    Join Date
    Mar 2010
    Location
    Colorado Springs, CO
    Posts
    14

    Re: PCV oil catch can, intake sludge

    I put on a crude PCV catch tank for the purposes of the trial. I ran fuel line hose (for fuel injection) from the PCV valve to the catch. The reason I used fuel line is that it is thick, and will stand up to oil/fuel. I want it thick to help insulate the line to oil does not condense in the hose.

    Though there are two valve cover vents, only the one with the PCV valve needs this modification. The other valve cover vent is for air intake. It flows into one valve cover and out the other.
    Here is the routing on a 99 DeVille.
    <a href="http://s656.photobucket.com/albums/uu289/cmobile/Cadillac/?action=view&current=PCVroutingmanifold.jpg" target="_blank"><img src="http://i656.photobucket.com/albums/uu289/cmobile/Cadillac/PCVroutingmanifold.jpg" border="0" alt="PCV"></a>

    closeup of PCV Valve
    <a href="http://s656.photobucket.com/albums/uu289/cmobile/Cadillac/?action=view&current=PCVvalve.jpg" target="_blank"><img src="http://i656.photobucket.com/albums/uu289/cmobile/Cadillac/PCVvalve.jpg" border="0" alt="PCV"></a>

    overview with vanity cover installed.
    <a href="http://s656.photobucket.com/albums/uu289/cmobile/Cadillac/?action=view&current=front.jpg" target="_blank"><img src="http://i656.photobucket.com/albums/uu289/cmobile/Cadillac/front.jpg" border="0" alt="PCV"></a>

    Closeup of catch can with oil drip. after 5 minutes of running at temp.
    <a href="http://s656.photobucket.com/albums/uu289/cmobile/Cadillac/?action=view&current=Catchcaninaction.jpg" target="_blank"><img src="http://i656.photobucket.com/albums/uu289/cmobile/Cadillac/Catchcaninaction.jpg" border="0" alt="PCV"></a>

  5. #4
    cmobile is offline Cadillac Owners Member
    Automobile(s): 1999 DeVille
    Join Date
    Mar 2010
    Location
    Colorado Springs, CO
    Posts
    14

    Re: PCV oil catch can, intake sludge

    The oil catch can is installed in the PVC system. It comes from the PCV valve to the front of the engine bay into the tank, then back to the the manifold vacuum. I ran it to the front because I believe the the cooler air will help to condense the oil fumes.

    Put about 100 miles today and I have a few drops of oil.

    The catch can is crude but it suits the need for this trial test, to determine any benefits.

    I used fuel hose which will help insulate the line-set to reduce oil condensation within the lines. It is one size bigger than the plastic lines and slips right over negating the need for extra fittings.

    Will keep you updated.
    ~C
    Attached Images

  6. #5
    cmobile is offline Cadillac Owners Member
    Automobile(s): 1999 DeVille
    Join Date
    Mar 2010
    Location
    Colorado Springs, CO
    Posts
    14

    Re: PCV oil catch can, intake sludge

    I installed the catch can last week. So far I have driven about 200 miles. I have about 1/4 oz of oil in the jar.

    I used a crude catch can initially to verify the effectiveness before spending any real money. So far it seems to be working.

    The OEM PCV system air flow comes from the TB into the "front" valve cover, through the crankcase an out the other rear valve cover through the PCV valve, then into the intake manifold. The hoses attach inline between the PCV valve and intake manifold. The catch can is installed at the front of the engine compartment to ensure the catch can was cool and would aid in condensing oil fumes.

    Going on a 1400 mile trip today. I'll keep you updated.

    ~C
    Attached Images

  7. #6
    thewireman* is offline Cadillac Owners Fanatic
    Automobile(s): 99 Cadillac Deville
    Join Date
    Feb 2008
    Location
    Paw Paw, MI
    Posts
    139

    Re: PCV oil catch can, intake sludge

    This is really interesting. Keep us updated!

  8. #7
    tateos's Avatar
    tateos is offline Cadillac Owners Connoisseur
    Automobile(s): 1997 ETC (GAVE TO STEPSON 2011), 2000 DTS (RIP)
    Join Date
    Jul 2007
    Location
    FOUNTAIN HILLS, AZ
    Age
    58
    Posts
    1,713

    Re: PCV oil catch can, intake sludge

    Yeah - very interesting!

  9. #8
    jsiddall is offline Cadillac Owners Fanatic
    Automobile(s): 09 SRX V8 AWD Sport, 06 STS V8, 05 SRX V8 AWD
    Join Date
    Oct 2009
    Location
    Ottawa, Canada
    Age
    40
    Posts
    154

    Re: PCV oil catch can, intake sludge

    Out of curiosity, how many people add oil until it is at the top mark on the dipstick? I read in some GM document that the top mark is actually an overfilled condition and the excess oil will be scavenged by the PCV system. I want to find the person that designed that dipstick!

    Regardless, my oil consumption dropped when I stopped filling it to the top mark on the dipstick.

  10. #9
    tateos's Avatar
    tateos is offline Cadillac Owners Connoisseur
    Automobile(s): 1997 ETC (GAVE TO STEPSON 2011), 2000 DTS (RIP)
    Join Date
    Jul 2007
    Location
    FOUNTAIN HILLS, AZ
    Age
    58
    Posts
    1,713

    Re: PCV oil catch can, intake sludge

    I used to fill to the top and add a quart when it hit the add mark - now I fill to the half way mark and add 1/2 quart when it drops to the add mark, or add a quart when 1/ quart below add. Frankly, I never noticed any difference in oil consumption, nor does my oil consumption of a quart every 1,500-2000 miles on every Northstar engine car I own or have owned (7 of them) bother or concern me in the least.

  11. #10
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
    Automobile(s): 2002.5 F55 STS/65500mi, 2004 Ford F150 SuperCab4x4
    Join Date
    Feb 2006
    Location
    MD Eastern Shore - Kent Island
    Age
    74
    Posts
    45,006

    Re: PCV oil catch can, intake sludge

    This particular aspect of Northstar dipstick operation (overfilling) is like


    as it has been discussed to ad nauseum in CF for years. The info is contained in many, many posts in here and up in Seville and Deville.

  12. #11
    tateos's Avatar
    tateos is offline Cadillac Owners Connoisseur
    Automobile(s): 1997 ETC (GAVE TO STEPSON 2011), 2000 DTS (RIP)
    Join Date
    Jul 2007
    Location
    FOUNTAIN HILLS, AZ
    Age
    58
    Posts
    1,713

    Re: PCV oil catch can, intake sludge

    Yeah - I know what you're sayin' Sub - it's old hat to us, but there are always new people cycling through that it's a brand new concept. It's like the another current thread where WOT is being discussed - some people have no idea what it is, how to do it, or what it achieves. I hate to say it, but I think a lot of members get the wrong idea and use the name "WOT" to beat the p_ss out of their car, which is really not the same thing. Anyway, I think if those of us that have been here for awhile try to remember the first time we learned about WOT and oil usage and motor mounts and head gasket problems, etc., we will find it more palatable to keep reading about and answering the same questions over and over.

  13. #12
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
    Automobile(s): 2002.5 F55 STS/65500mi, 2004 Ford F150 SuperCab4x4
    Join Date
    Feb 2006
    Location
    MD Eastern Shore - Kent Island
    Age
    74
    Posts
    45,006

    Re: PCV oil catch can, intake sludge

    Granted ............. but sometimes it would be simpler to ask people to do some homework rather than type the same thing over again every 10 days. Even other members, most of who know a heck of a lot about Northstars, get a bit snarky once in a while when someone asks the same question that was answered last evening.

    I'm not bitching - but this set of Forums is like Webster's Unabridged: very large, but the information is in there to be found. All of it.

    ......back to the oil catch can....... I did some snooping this morning, prompted by cmobile's pictures. My car has the fixed orifice PCV rather than the rattle valve. The inside of the PCV vacuum line - from the rear cam cover to the inner center of the intake manifold recess - is essentially dry and clean. With the engine idling there is significant vacuum (therefore, airflow) in that line. My engine gets over 4,000 miles to the quart of 5W-30 Pennzoil synthetic. Which begs the question: Does the orifice type of PCV vacuum metering contribute to lessened oil consumption ? What say you, 2000+ Northstar owners ???

    Note that both types of system source clean air from just upstream of the butterfly, at the non-vacuum side of the TB.

    and, you'll notice that the earlier, pre-2000, PCV vacuum (and therefore, vapors) is ported to the throttlebody, right after the butterfly. Does this somehow contribute to throttlebody dirt and grime ? - my TB generally stays very clean. Very clean.

  14. #13
    tateos's Avatar
    tateos is offline Cadillac Owners Connoisseur
    Automobile(s): 1997 ETC (GAVE TO STEPSON 2011), 2000 DTS (RIP)
    Join Date
    Jul 2007
    Location
    FOUNTAIN HILLS, AZ
    Age
    58
    Posts
    1,713

    Re: PCV oil catch can, intake sludge

    Quote Originally Posted by submariner409 View Post
    Granted ............. but sometimes it would be simpler to ask people to do some homework rather than type the same thing over again every 10 days. Even other members, most of who know a heck of a lot about Northstars, get a bit snarky once in a while when someone asks the same question that was answered last evening.

    I'm not bitching - but this set of Forums is like Webster's Unabridged: very large, but the information is in there to be found. All of it.
    Yeah - I know, Sub, and I agree with you, and I am not criticizing you. I'm tired of seeing the same questions all the time, but let's face it - it's not going to change. I'm just suggesting that it might help all of us old guys to be less crotchety if we try to remember when we were the newbies.

  15. #14
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
    Automobile(s): 2002.5 F55 STS/65500mi, 2004 Ford F150 SuperCab4x4
    Join Date
    Feb 2006
    Location
    MD Eastern Shore - Kent Island
    Age
    74
    Posts
    45,006

    Re: PCV oil catch can, intake sludge

    Fer the luvva' Pete, who the devil is crotchety ???

  16. #15
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    66
    Posts
    73,836

    Re: PCV oil catch can, intake sludge



    Which begs the question: Does the orifice type of PCV vacuum metering contribute to lessened oil consumption ? What say you, 2000+ Northstar owners ???
    Good question and it make one wonder why they switched to that system, but I have no answer. Mine does not seem to get very dirty, but then again, I clean mine every spring.

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.
If you do not want to register, fill this field only and the name will be used as user name for your post.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Bookmarks

Cadillac Posting Rules

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
Read about Lincoln | Buick | Kia Forte Forum
Need products for your Cadillac? Check out your options at the links below:

custom floor mats | Cadillac Chrome and Black Chrome Wheels | window tinting