Why no blue smoke if no catch can?

Discussion in 'SRT Hellcat Maintenance' started by Jungle Cat, Jun 22, 2016.

  1. Jungle Cat

    Jungle Cat Silver Member

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    Just curious for all you catch can fans. Why am I not getting gobs of blue smoke out the exhaust if so much oil is bypassing the rings neccesitating the catch can? Inquiring minds want to know. Engines with worn rings sure make some smoke.
     
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  2. ciphros

    ciphros Gold Member

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    Catch can is not for oil getting past the rings. It is oil VAPOR that is being recirculation int the intake system by the pcv valve.
     
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  3. Jungle Cat

    Jungle Cat Silver Member

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    The video posted about Motorweek. mentions the catch can is needed because of oil bypassing the new style piston rings.
     
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  4. Aarcuda

    Aarcuda Gold Member

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    did it say oil bypassing the rings or pressure causing the oil vapor to get suxcked up into the PCV system?
     
  5. Jungle Cat

    Jungle Cat Silver Member

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    I know he mentioned the rings but will need to watch again
     
  6. Jungle Cat

    Jungle Cat Silver Member

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    He is blaming sticking piston rings causing pressure. Not as clear where oil is coming from but if there is oil in the intake you would think it would find its way into the combustion chambers either way right?
     
  7. Paladin06

    Paladin06 Have Guns Will Travel Staff Member Hellcat Car Club Gold Supporting Member

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    Motorweek, :p:p:p:p:p:p:p
     
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  8. Aarcuda

    Aarcuda Gold Member

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    sticking rings make sence. the rings stick to the piston and dont hug the cyl wall. pressure escapes past the rings and pressurizes the crankxcase which forces oil into the PCV system that gets routed to the intake.

    i guess the oil gets hung up in the intake and doesnt drip into the cylinders so no blue smoke
     
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  9. Dragon

    Dragon Gold Member

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    I don't have very much oil in my catch can.
     
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  10. TallCool1

    TallCool1 Gold Member Hellcat Car Club Gold Supporting Member Nat'l Hellcat Tech Advisor HCC Charter Member

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    Don't just consider blowby, its also about oil flow top end and the creation of mist that isnt blowby. In combination with cc evac and route un captured mist travels if its escapes the rocker cover separators. Vacuum is another component, how much and when and how that relates.
     
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  11. ciphros

    ciphros Gold Member

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    20160622_204009.jpg

    I had just installed my catch can, this is what I found on the intake side of the pcv return line.
     
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  12. Mopar Magic

    Mopar Magic Hellcat Member

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    Because there's not enough oil all at once to produce enough smoke to be visible. The blow by is worst at WOT where the volume is highest. It doesn't matter if the source is directly from blow by or atomization of the oil from high pressure or something else. If oil is getting past the pcv valve it will end up in the intake and will be burned. Yes it may collect or pool for a while somewhere but trust me at WOT those pools get cleaned out.

    Having said that, I have yet to put a catch can on my car. I watch the oil level pretty close so I know it's not a significant amount on my car. I also don't race it although it still gets pretty regular WOT stints. :)
    I will likely put a catch can on my car at some point though...
     
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  13. Jungle Cat

    Jungle Cat Silver Member

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    Pretty much my view. Watch and wait. I am guessing if there is a real issue there will be a recall and Chrysler will add a factory catch system which I would rather have than some obtrusive after market blingidy bling. If they don't they would get hammered with warranty work on guys like me who will have warranty in effect for 7 years. Wirh almost a million defective auto gear shifters in Jeeps etc. I don't think they need anymore big issues.
     
  14. Jungle Cat

    Jungle Cat Silver Member

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    I know I know I fixed it.
     
  15. srtdusty

    srtdusty Silver Member

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    Catch cans have been debated for over ten years in the SRT community, to include live chats with the SRT engineers on different forums. Simple you want one get one. You don't want one don't get one.
     
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