PCV Routing Help
Thread Starter
Le Mans Master
Joined: Oct 2006
Posts: 6,080
Likes: 0
From: Houston TX
PCV Routing Help
Tried searching on 5 different forums so don't tell me to use the search.
Need simple ( BIG ) pictures of how to route this. I have twin turbos and 1 catch can. Also, Since there is only 1 vacuum source on the front of the engine, where is everyone mounting:
Boost line
waste gate sources
blow off valve sources
Hobbs switch
Currently I have the waste gates run to where the PCV was and the blow off valve run into that T. I have ran the Hobbs switch t'd into the waste gate as well.
Help please. Internet stupid today
Need simple ( BIG ) pictures of how to route this. I have twin turbos and 1 catch can. Also, Since there is only 1 vacuum source on the front of the engine, where is everyone mounting:
Boost line
waste gate sources
blow off valve sources
Hobbs switch
Currently I have the waste gates run to where the PCV was and the blow off valve run into that T. I have ran the Hobbs switch t'd into the waste gate as well.
Help please. Internet stupid today
Le Mans Master
Joined: Oct 2005
Posts: 7,088
Likes: 1,829
From: Metro Detroit Michigan
What's common is to cut the brake booster line and insert a fitting with multiple small hose barbs for boost gauge, waste gate, blow off valve, Hobbs switch.
The PCV system can be run normally with the catch can inserted before the manifold, except that you need a supply air source (the normal supply from the throttle body must be capped) and possibly a check valve to keep manifold pressure from back-flowing to the crankcase under boost. Depending on which PCV valve you have, it may work fine as a check valve.
A well-baffled valve cover breather works well as the new make-up air source, and will also vent crankcase pressure under boost when the PCV isn't working. Some people run a hose to the air cleaner instead, but this may not have enough flow to adequately relieve pressure when it back-flows under boost, and I don't like the idea of routing dirty crankcase vapors through the intercooler.
The PCV system can be run normally with the catch can inserted before the manifold, except that you need a supply air source (the normal supply from the throttle body must be capped) and possibly a check valve to keep manifold pressure from back-flowing to the crankcase under boost. Depending on which PCV valve you have, it may work fine as a check valve.
A well-baffled valve cover breather works well as the new make-up air source, and will also vent crankcase pressure under boost when the PCV isn't working. Some people run a hose to the air cleaner instead, but this may not have enough flow to adequately relieve pressure when it back-flows under boost, and I don't like the idea of routing dirty crankcase vapors through the intercooler.
