Register now to get rid of these ads!

Customs SBC TWIN TURBO SMOKING

Discussion in 'The Hokey Ass Message Board' started by 34ford 454, May 15, 2019.

  1. 34ford 454
    Joined: Aug 9, 2017
    Posts: 3

    34ford 454

    Can anyone HELP?
    I have a sbc 350 with twin turbos and a mild cam. It has a new Howards roller can with roller lifters and roller clam shell rockers, electric fuel pump. It does not use oil and I have no excessive oil leaks anywhere. No coolant loss either. I rebuilt it less than 100 miles ago with everything new. It is smoking out the exhaust pipes and I have done everything I can think of to stop the smoke. It has a reservoir oil tank with a scavenger pump to pump the turbo drain oil back to the fuel pump opening back to the pan. No pressure here, just steady stream of oil. I have disconnected turbo drain line and dumped into open can; I have removed the forced air turbo referenced connection to the hat; I have put PCV on one valve cover; I have vented the other valve cover to the air under car; I have disconnected both forced air tubes from the carb hat; Had a rocker stud broken and replaced with screw in stud and new roller rocker; engine cranks and runs good with no apparent issues other than the smoke. It is a blackish blue in color. I have reduced the amount of fuel by carb adjustment and fuel pump regulator to the minimum amount to keep the car running thinking that it was over fueling.
    STUMPED.
     
  2. squirrel
    Joined: Sep 23, 2004
    Posts: 42,268

    squirrel
    Member

    blackish sounds like rich mixture.

    put a wideband O2 sensor on it, see what's up with the fuel mixture?
     
    porknbeaner and VANDENPLAS like this.
  3. VANDENPLAS
    Joined: Dec 14, 2009
    Posts: 1,673

    VANDENPLAS
    Member

    Sounds like it’s rich
    Intake or turbo pipes oily indicating it’s eating oil?
    Vacuum / boost readings ?
    Leak down / compression test?
    I would start with that
    And with what @squirrel said about the wide band o2
     
  4. lippy
    Joined: Sep 27, 2006
    Posts: 3,934

    lippy
    Member
    from Ks

    What do the plugs look like? Lippy
     
    porknbeaner likes this.
    Register now to get rid of these ads!

  5. Does the PCV you installed have a good baffle under it? Mine did not have one and smoked. I made a plate/baffle inside the valve cover and all is well.
     
    Chucky and squirrel like this.
  6. badvolvo
    Joined: Jul 25, 2011
    Posts: 335

    badvolvo
    Member

    I had a turbo failure when I was playing with them in the 90's. It spooled up fine, but pulled oil through the seal while at idle. The smoke would clear once she spooled. But oil burns blue, fuel burns black.
     
    Bearcat_V8 likes this.
  7. Dyce
    Joined: Sep 12, 2006
    Posts: 1,761

    Dyce
    Member

    Is it a blow through system? Where do you have the pcv plumbed in? Manifold vacuum does turn into boost if the turbos are doing there job.
     
    porknbeaner likes this.
  8. sunbeam
    Joined: Oct 22, 2010
    Posts: 3,954

    sunbeam
    Member

    Do I understand you have a PCV and what is essentially a road draft tube. So you are pulling a vacuum on one valve cover and a open tube hanging under the car on the other not good.
     

Share This Page

Register now to get rid of these ads!

Archive

Copyright © 1995-2020 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Terms of Service. Privacy Policy.

Atomic Industry
Forum software by XenForo™ ©2010-2014 XenForo Ltd.