Hello,

New to this forum. I have searched and read all applicable crankcase ventilation content I could find on this site. Very informative!

I am building a GEN 1 SBC small displacement engine purpose built for a roots-style blower. I am using a TBS 6v-71 blower.

I have constructed a deign for a crankcase ventilation system below. I do not have an MAF sensor. I do not want to use a PCV valve.

I think I have this setup correct. Please comment on the functionality of this system.

Your time and consideration is much appreciated!

• No PCV valves used
  • When the supercharger makes boost, a PCV valve could be forced shut
  • This could effectively close a crankcase ventilation system
• Route hoses from open fittings in the rear of each valve cover to “Y” connector
  • Baffles must be used inside valve cover openings, below fitting
  • In-line check valves used to limit directional flow out of engine
• Route a single hose from outlet of the “Y” connector to an air/oil separator inlet
• Connect air/oil separator outlet to breather tank inlet
  • Valve covers vent through the air/oil separator, and then through the breather tank
  • Allows the engine to breath freely while containing any oil that may be drawn up through the system
• Route a single hose from breather tank outlet to fuel pump block-off plate fitting
  • In-line check valve to limit one-directional flow into engine
  • Returns a combination of filtered crankcase air and fresh air back into the engine

 

Another suggestion: take a look at the PCV system used in turbocharged Volvos from mid 80s onwards for inspiration.
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It is not letting me edit the post, so

A is the hose to the intake manifold
B is a hose about the same diameter as E which goes to a port just ahead of turbo
C is only available with N/A cars
F is a kind of oil separator, hence the H hose.