PCVs and turbos
The front vent is active when there is not much vacuum (more flow output and a larger hose), the rear vent is active during vacuum(has a smaller hose because of less output. The valve covers are connected together on the timing cover side by a hose.
You actually get most oil in the intake during idle because there is no catch. The factory midpipe has a catch but not really much oil droplets get through there like on the pcv valve side, so just putting a filter on the front valve is fine, the rear is the one we should worry about.
For boost I looked at pictures of how turboed supras are set up. The larger hose (front valve cover) goes to the turbo/sc inlet. You would have to use an adapter or special pipe. I ran a catch to intercept the pcv side and used this type of inlet on the turbo intake side. It's not the same exact one but you get the idea. You can make one with a fitting and silicone elbow, but it is not that important unless you get a bit of blow by. The one on the rear is what keeps the intake manifold clean.
You actually get most oil in the intake during idle because there is no catch. The factory midpipe has a catch but not really much oil droplets get through there like on the pcv valve side, so just putting a filter on the front valve is fine, the rear is the one we should worry about.
For boost I looked at pictures of how turboed supras are set up. The larger hose (front valve cover) goes to the turbo/sc inlet. You would have to use an adapter or special pipe. I ran a catch to intercept the pcv side and used this type of inlet on the turbo intake side. It's not the same exact one but you get the idea. You can make one with a fitting and silicone elbow, but it is not that important unless you get a bit of blow by. The one on the rear is what keeps the intake manifold clean.
Rear cover Im going from the PCV into the catch can INLET and OUTLET of catch can back into the manifold. This is the right way to do it from what I been reading. Please feel free to correct me if Im wrong.. Others maybe be getting less blow by gasses and may be fine with just 1 catch can for the rear cover PCV only.. but not in my case.
Try front valve cover to s/c inlet only before you invest in a 2nd catch can. Unless you are getting actual oil from the front cover there is no need for a 2nd can. The valve cover is baffled decently so you shouldn't be getting any oil there, just fumes. If you are getting oil, then go ahead with the 2nd can.
Try front valve cover to s/c inlet only before you invest in a 2nd catch can. Unless you are getting actual oil from the front cover there is no need for a 2nd can. The valve cover is baffled decently so you shouldn't be getting any oil there, just fumes. If you are getting oil, then go ahead with the 2nd can.
Saiko michi has a nice dual design http://www.saikoumichi.com/DC3_page.htm already working with them on a custom one for my setup. Cant beat their price and design for 2 catch cans.
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litch
4th Generation Maxima (1995-1999)
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Jan 4, 2024 07:01 PM