[s-cars] Crank Case Pressure and Turbo Smoke?

[Mark Strangways]

I could see that happening, with a large volume of air the sudden discharge could very well create a positive pressure in that hose.

I don't have it connected, so I haven't seen that problem, YET.

Mark
  ----- Original Message ----- 
  From: Djdawson2 at aol.com 
  To: strangconst at rogers.com ; powellb at gmail.com ; s-car-list at audifans.com ; cpayne at bconnected.com 
  Sent: Tuesday, February 22, 2005 8:38 PM
  Subject: Re: [s-cars] Crank Case Pressure and Turbo Smoke?


  In a message dated 2/22/2005 6:32:27 PM Mountain Standard Time, strangconst at rogers.com writes:


    I have a diagram from alldata that shows the valve, a check valve and the 
    airflow routing thru the valve cover.
    During idle the air is routed to the VC and thru it, as it appears that it 
    has a pipe inside it. During partial load the pressure control valve allows 
    the engine to pull the crankcase air into it. At no point does it so the 
    crankcase being pressurized by the turbo inlet.



  That's entirely correct.  However, a big turbo, with a large bypass volume "could" send pressure back through the VC towards the crankcase.

  Put it this way... when I first installed my GT30 etc... I had huge smoke at every deceleration, and every shift.  Installing a PVC in line on the hose that goes from the VC to the turbo/MAF hose completely solved the problem.  My assumption here was that bypass air was pressurizing the crankcase, which causes smoke.
  Dave