PCV "flapper"

ferocity02 · 07-30-2014, 03:02 PM

Is the PCV "flapper" supposed to flow air in reverse? Mine flows in reverse a little bit, but flows relatively freely in forward. The part I'm talking about is labeled with an "L" in this picture. By forward flow I mean from L to R.

Also what is the part labeled with an "R"? It has a couple wires that go into it.

shawntech · 07-30-2014, 03:42 PM

mine does, there's a relief hole before the flapper... I did the same thing

Ingeniator · 07-30-2014, 03:47 PM

R is the PCV heater.

pwr hungry · 07-30-2014, 09:22 PM

Your valve is operating normally. The valve will suck shut when the manifold is under vacuum and the other pcv valves opens.

3000GT MR · 07-30-2014, 09:53 PM

The flapper is there for when your diverter valve releases air back into the preturbo inlet it doesn't back track into your pcv system in the event you build positive pressure

07-30-2014, 03:02 PM	#1
ferocity02 Colonel 538 Rep 2,084 Posts Drives: 2013 135is Join Date: May 2014 Location: USA iTrader: (8)	PCV "flapper" Is the PCV "flapper" supposed to flow air in reverse? Mine flows in reverse a little bit, but flows relatively freely in forward. The part I'm talking about is labeled with an "L" in this picture. By forward flow I mean from L to R. Also what is the part labeled with an "R"? It has a couple wires that go into it.
	Appreciate 0 Tweet Quote

07-30-2014, 03:42 PM	#2
shawntech The Wolf 256 Rep 992 Posts Drives: stuff Join Date: Oct 2013 Location: Midwest iTrader: (0) Garage List [0.00] 2019 BMW M850i conv ... [0.00]	mine does, there's a relief hole before the flapper... I did the same thing __________________ -2019 BMW m850i convertible -2021 Dodge Charger Hellcat Redeye Widebody
	Appreciate 0 Quote

07-30-2014, 03:47 PM	#3
Ingeniator Major 34 Rep 1,093 Posts Drives: 07 335XI(90) 09 135I(82) Join Date: Nov 2013 Location: Fort Mac, Alberta iTrader: (1)	R is the PCV heater. __________________ 07 335XI (A008006) 6AT ~94K miles JB4 G5 ISO VSRF DP's 09 135I M (VK80379) 6MT. Race Project car. 1) Install Cobb/piggyback? and Motiv 600 Kit[HTA3076R w/ tial .82] 2) JRZ or Moton suspension. 3) Build high flow intake manifold with multi-port fuel and relocate OFH 4) Build full cage 5) Complete staged twin setup with HTA4205R [w/Tial 1.16] 6) Complete dry sump system
	Appreciate 0 Quote

07-30-2014, 09:22 PM	#4
pwr hungry Banned 41 Rep 1,257 Posts Drives: 335 Join Date: Mar 2013 Location: Amer'ca iTrader: (2)	Your valve is operating normally. The valve will suck shut when the manifold is under vacuum and the other pcv valves opens.
	Appreciate 0 Quote

07-30-2014, 09:53 PM	#5
3000GT MR Major 265 Rep 1,392 Posts Drives: 09 335i/3000gt vr4 Join Date: Jun 2012 Location: Sav GA iTrader: (6)	The flapper is there for when your diverter valve releases air back into the preturbo inlet it doesn't back track into your pcv system in the event you build positive pressure __________________ Have a single turbo and/or tired of burning up O2 sensors? Ask me about the new ADV O2 sensor retro kits! 335i 2010 e92 M-sport Mods: VM Top mount 6466, Aquamist HSF4 w/custom direct port. VRSF IC + Exhaust 335i 2009 e90 665RWHP VFF900 ST RIP .
	Appreciate 0 Quote