for anyone that has crankcase pressure issues
yes, its FAR less baffled than the front side port. But its easy to put a plug on that rear port.
EvoM Guru
iTrader: (50)
Joined: Mar 2006
Posts: 9,675
Likes: 132
From: Tri-Cities, WA // Portland, OR
Here is a breather option that maintains the factory PCV flow, provides good crankcase ventilation, and does not require drilling the valve cover. The downside is that the PCV port is known to suck oil under hard acceleration, so the catch can could fill up quickly under those conditions, especially without a Kiggly HLA.
Last edited by mrfred; Feb 12, 2014 at 07:03 AM.
Here is a breather option that maintains the factory PCV flow, provides good crankcase ventilation, and does not require drilling the valve cover. The downside is that the PCV port is known to suck oil under hard acceleration, so the catch can could fill up quickly under those conditions, especially without a Kiggly HLA.

EvoM Guru
iTrader: (50)
Joined: Mar 2006
Posts: 9,675
Likes: 132
From: Tri-Cities, WA // Portland, OR
As long as an OEM PCV valve is used in the location I show, there will be no adverse effects of this layout. Also, the check valve needs to have the lowest possible crack pressure. I mentioned Boomba because I have one, and have found it to have a low crack pressure.
Mrfred so with the latest version of your catchcan setup the vta check valve opens under boost and the pcv closes due to boost and pulling vacuum it's reversed? And with a kiggly hla how quickly is quickly, I'm looking at this for a dd so I don't want to be loosing too much oil because I am passing cars on a long drive. Not trying to argue just understand the dynamics more.
EvoM Guru
iTrader: (50)
Joined: Mar 2006
Posts: 9,675
Likes: 132
From: Tri-Cities, WA // Portland, OR
At this point, I have not noticed any additional oil coming out the rear of the VC under normal driving or WOT straight line.
Here is a breather option that maintains the factory PCV flow, provides good crankcase ventilation, and does not require drilling the valve cover. The downside is that the PCV port is known to suck oil under hard acceleration, so the catch can could fill up quickly under those conditions, especially without a Kiggly HLA.


EvoM Guru
iTrader: (50)
Joined: Mar 2006
Posts: 9,675
Likes: 132
From: Tri-Cities, WA // Portland, OR
http://www.streettunedmotorsports.co...er_fitting.htm
anyone try this -12 fitting for the plugged hole when you delete your balance shafts? i just ordered one, and am going to try it out. but i cant seem to find any info on it here
anyone try this -12 fitting for the plugged hole when you delete your balance shafts? i just ordered one, and am going to try it out. but i cant seem to find any info on it here
So, from what I gather from the FP posts and there link it looks like they are running 2, -10AN lines from the VC to a sealed catch can and a -10AN line from catch can to air intake. Although the post that Michael from FP made says he made a "custom vent from the block" ......so maybe I am wrong.
So, any guesses as to how the PCV and/or check valves are run in their setup?
So, any guesses as to how the PCV and/or check valves are run in their setup?




