Guy wants me to dyno a street blower engine 350 chevy. He has a PCV valve and vent cap on the engine. Was doing a little reading and several recommended a motorcraft PCV E5ZZ-6A666-A as it is set up for a boosted application. What do you guys use for a PCV in a mild blower engine?
I always used two vents on each valve cover or backfire valves in the headers.
PCV and a Blower
Moderator: Team
Re: PCV and a Blower
All pcv valves have a anti back fire safety valve inside.
So if you want you can bench test a pcv valve by applying compressed air to it and see with a pressure guage. how much applied pressure causes the pcv valve to close the anti back fire part of it....
If it does close within the blowers boost pressure. you can run it with twin valve cover vents..
Pot luck wether a oem pcv valve will provide the right flow at idle and at cruise with the blower..
May need an adjustable pcv or a simpler "fixed orrifice"type pcv
No experience with that ford pcv.
If the trans has a vacuum modulator. there is a GM diesel version for blown motors.
So if you want you can bench test a pcv valve by applying compressed air to it and see with a pressure guage. how much applied pressure causes the pcv valve to close the anti back fire part of it....
If it does close within the blowers boost pressure. you can run it with twin valve cover vents..
Pot luck wether a oem pcv valve will provide the right flow at idle and at cruise with the blower..
May need an adjustable pcv or a simpler "fixed orrifice"type pcv
No experience with that ford pcv.
If the trans has a vacuum modulator. there is a GM diesel version for blown motors.
Re: PCV and a Blower
On a supercharged engine it is imparative that effective oil separation valve cover baffling be used in the valve covers.. And if needed, a inline oil separator eliminate oil migration up the PCV hose. Especially if the PCV is connected at the carb(s), above the blower.
You want to avoid oil being sucked into a supercharged engine as it promotes detonation under WOT boost.
You want to avoid oil being sucked into a supercharged engine as it promotes detonation under WOT boost.