PCV Valve / Rocker Cover Breather
- Thread starter Aidan@EP-styling
- Start date
Gee
Member +
Haha.
Lots of people run catch cans, we know they are not 100% efficent, but I am not bothered.
I know my catch can setup is not 100% to the atmosphere like yours, but it has a breather on top, so some gases maybe caught by the catch can and some are escaping from the breather to the atmosphere?
But I'm changing the setup anyway.
Lots of people run catch cans, we know they are not 100% efficent, but I am not bothered.
I know my catch can setup is not 100% to the atmosphere like yours, but it has a breather on top, so some gases maybe caught by the catch can and some are escaping from the breather to the atmosphere?
But I'm changing the setup anyway.
KOWAL
Fresh Recruit
lads if somebody sort it up this problem, because I do the same mistake and could somebody put it here the photo how do that properly with my oil catch??
I don't have idea where can I put the houses, everybody say something different and I'm confused, now I suppose to do now??
I don't have idea where can I put the houses, everybody say something different and I'm confused, now I suppose to do now??
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munday
Member +
most people decided you can do it either way, plumb it back into the intake or vent the catch can to atmosphere, I've said what I would prefer, and others have given their opinions in the rest of this thread.
Oh and a quck point about the pcv valve...how can it let fresh air into the engine when it's a one way valve? LOL the inlet is under vaccum apart from when you are on boost, and if the pcv valve was open then to let 'fresh air' into the crank case you would pressurise it, so the pcv only vents the blowby gasses that create positive pressure when the inlet is under negative pressure
Oh and a quck point about the pcv valve...how can it let fresh air into the engine when it's a one way valve? LOL the inlet is under vaccum apart from when you are on boost, and if the pcv valve was open then to let 'fresh air' into the crank case you would pressurise it, so the pcv only vents the blowby gasses that create positive pressure when the inlet is under negative pressure
Hey John,
Beleive it or not, but i do get residue in the tank. Mushy, stinking stuff!
Also condensation which is innevitable.
Gee - No diffirence in function between them.
Only diffirence being, i run a line to the underside of the car away from the airflow, to act as a vacume. That setup is venting in the engine bay through the little filter. Id rather not have this, hence i run the line under the car.
so you did a t fitting between the pcv valve and the cam breather? then vented the other line?
PCV valve is a one-way vlave. It lets gasses out thats all
100 percent agree with these statement
azerty
Supermoderator
why don't we just have two tube lines coming of PCV and BOV breather going down the engine bay with two small filters so nothing can go up in. klung the intake entry (that was supposed to be connected to PCV).
this would be illegal yes. but no need to worry about oil catch can nor octane troubles.
wouldn't it be most efficient setup ?
this would be illegal yes. but no need to worry about oil catch can nor octane troubles.
wouldn't it be most efficient setup ?
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Dane_Bristol
Member +
Well i have just vented both of them to atmosphere. As recommended by Dave B and as he built the engine i trust his word so have forgot about the catch can altogether and i have mine venting under the car.
Dane_Bristol
Member +
Yes indeed
Rory
Lifer
Quick run through of what ive done,
Ive gutted the PCV valve, so it can breathe normal.
Ive routed the line from the PCV valve into the same line as the other breather point on the cam cover, with a T-Peice.
This then runs to the catch can.
Ive blocked the inlet manifold, where the PCV would attach.
On the other port of the can, i run a line under the car, pointing backwards, this acts as a vacume, and pulls gasses out, but leaves oil residue in the tank.
Also there is no contamination of inlet charge.
Rory
Well i have just vented both of them to atmosphere. As recommended by Dave B and as he built the engine i trust his word so have forgot about the catch can altogether and i have mine venting under the car.
This is the way they did it "back in the days"
Nothing wrong with it technically, but it is illegal and can be dangerous.
You'll be banned of the circuit if they see this as you'll leave oil on the track (OK, it's a very small amount but still)
That's why you won't see race cars with this setup.
It's exactly the same when you connect them to a catch tank with a big breather on. Downside is that you'll have to empty it frequently.
Dane_Bristol
Member +
This is the way they did it "back in the days"
Nothing wrong with it technically, but it is illegal and can be dangerous.
You'll be banned of the circuit if they see this as you'll leave oil on the track (OK, it's a very small amount but still)
That's why you won't see race cars with this setup.
It's exactly the same when you connect them to a catch tank with a big breather on. Downside is that you'll have to empty it frequently.
Its staying like that
Dane_Bristol
Member +
cor that inlet mani looks shocking dane, sort it out
The pictures wasint aimed a clean engine bay lol
Its going to get a proper clean once the new turbo goes on this weekend
Gee
Member +
Its staying like that
Might not let you on track come March like that..bring a catch can just in case
They might inspect the cars.