Crankcase evacuation system not work on a 489 cui Hemi Charger

Mopar Exhaust Systems

  1. Moparjack 489

    Moparjack 489 FBBO Gold Member FBBO Gold Member

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    Hi all ,
    Looking for some help about my evac. System on my 68 Charger with a Hemi.

    If I check my evac. System with disconnecting the breathers on the valve covers when engine in idle i not feel any vacuum , i Little Shocked because I feel the opposite , I feel the exhaust gases come out of the breather .
    Seems the check valve absolutely no work .... any idea ?

    The crankcase evacuation system is from Allstar and the Tube are welded in already from TTI when I order the HEMI625-218 Headers. The whole exhaust system is a 3“ from TTI with H-pipe and Flowmaster 50 series mufflers .

    Now I ask my self, what’s the biggest problem and why the check valve not work .

    Is the Flowmaster 50 series to restrictive muffler?
    What a muffler are the best non restrictive for using a evac.system?
    ( I know many people say an evac. System not work with a muffler exhaust , but I see and hear also the opposite )

    And is maybe the H-pipe also a Problem for an evac System ?



    Happy for any help!
     
  2. Lefty71

    Lefty71 FBBO Gold Member FBBO Gold Member

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    You mean Vac-U-Pan?? Any pix of the install, and the locations of the welded in wyes?

    They really are made for open header, high rpm. If you are testing them at idle, I'd say its not going to work well if open headers, and not at all with any muffler.
     
    Last edited: Sep 8, 2019
  3. Moparjack 489

    Moparjack 489 FBBO Gold Member FBBO Gold Member

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  4. HEMI-ITIS

    HEMI-ITIS STREETER on LI FBBO Gold Member

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    I push in breathers for many years with a pan evac system untill I started blowing the breathers off.I went to a moroso bolt in breather and 2 puke tanks.Works well,keeps any oil from entering the combustion chamber causing detonation

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    • snakeoil24

      snakeoil24 FBBO Gold Member FBBO Gold Member

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      If the evac into header is not angled right no luck also most vacum is at high speed
       
    • Moparjack 489

      Moparjack 489 FBBO Gold Member FBBO Gold Member

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      Interesting , you driving also with full exhaust system inkl. Mufflers?

      My breathers also blow off .

      That means you not go anymore over the headers for crankcase ventilation , just put a the hose from the breather to the puke tanks with ventilation on top ?

      That means for the beginning it ok I just disconnect my hoses from the headers and let it in the atmosphere ?

      It also means is not necessary to switch to a PCV - system ? Right ?
      Just let them breath ? No vacuum suction needed ?
       
    • 493 Mike

      493 Mike FBBO Gold Member FBBO Gold Member

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      Have you looked at the Wagner adjustable PVC valve. It gets good reviews.
      Mike
       
    • Moparjack 489

      Moparjack 489 FBBO Gold Member FBBO Gold Member

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      Thanks, but I want looking more for a good alternative to the evacuation system over the headers .
      Because it seems to me it not work with my full exhaust system .
      But anywhere I really wonder why the not work properly and I feel some exhaust gases came up from the headers collector to my breather into my valve covers ...,

      Anywhere

      I not really sure what the best solution on my set up . But I like the just breather solution maybe with an oil/air separator just to keep the engine compartment clean and oil free , and not suck in all the blowby vapors like a PCV it does .

      It‘ s a 489 cui Street Hemi and use 90% just on the Street and faster drives on the Highway in Germany .
       
    • Moparjack 489

      Moparjack 489 FBBO Gold Member FBBO Gold Member

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      Yesterday I check deinstall my checkvalve on the collector tube and test it. The air flow in both way means the check valve not working well.
      After I cut it apart I see the rubber flap full burned off.

      Any idea to fix this problem before install new check valves ?

      I had some old one and install it right now , but this time with a little bid Teflon around the thread before turn in on , for get the valves colder , don’t know it makes sense .

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    • 383man

      383man Well-Known Member

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      I have been told that evac system into the header collectors wont work very good with a full exh system on the car. So I never tried it on my street car as I just run a PCV system and it works pretty good for the cam I use. Ron
       
    • Moparjack 489

      Moparjack 489 FBBO Gold Member FBBO Gold Member

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      I can’t run and won’t run an PCV System on my Hemi.
      I just can switch to breather going in to a catch can . Like Hemi-ITIS do it, but on my Hemi i drive the original sheet valve cover‘s and can not use srew on Breather on it...

      Anywhere , before I switch to something like breathers with catch can first I want try to install a other muffler ... now I drive the Flowmaster 50 and read in a other conversation somebody talk about some Hooker muffler they are non restrictive and best to use for geht less backflow.

      I found these guys on summit , and he talk about this mufflers

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