Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB - View Single Post

86fun · 09-19-2018, 02:20 PM

I'm confused why there are two PCV ports on the block(s). Can someone explain why?

One is on the right half and one on the left half. The passenger side port goes to the intake manifold after the throttle body. The drivers side port is plumbed into the intake before the throttle body. Why are there two? and why would they vent back to the intake differently? Isn't the case a single space cavity inside the two block halves? I'm guessing there is a difference between the two, why else would they vent differently. Why is this?

I put this in the forced induction area because I want to understand how the PCV system works so that I can fully understand the implications of different kinds of forced induction will have on it (turbo, roots SC, centrifugal SC).

09-19-2018, 02:20 PM	#1
86fun Senior Member Join Date: Jan 2015 Drives: 2013 FRS Location: California Posts: 170 Thanks: 18 Thanked 69 Times in 39 Posts Mentioned: 8 Post(s) Tagged: 2 Thread(s)	How does the FA20 PCV system work? I'm confused why there are two PCV ports on the block(s). Can someone explain why? One is on the right half and one on the left half. The passenger side port goes to the intake manifold after the throttle body. The drivers side port is plumbed into the intake before the throttle body. Why are there two? and why would they vent back to the intake differently? Isn't the case a single space cavity inside the two block halves? I'm guessing there is a difference between the two, why else would they vent differently. Why is this? I put this in the forced induction area because I want to understand how the PCV system works so that I can fully understand the implications of different kinds of forced induction will have on it (turbo, roots SC, centrifugal SC).