EFi Breather Setup
4 posts • Page 1 of 1
EFi Breather Setup
Blew my turbo up a while ago from overboost, fixed it and had everything patched back up again, but looks to have popped the bottom off the breather pot on the left hand side of the engine bay (as you look at it from the front). Or the pot was so old it fell apart. Whichever
I want to check I've got everything piped up properly, because I know I'm missing a couple of things that I want to put back on
The head vents to the breather pot. That's OK.
What looks like the crankcase breather or inlet vent comes through a small pipe, into a one way valve and into the breather. The pipe, running right to left looks like this: ----<----¦----- where the < is the one way valve. Is that facing the right way?
Also, there's a third take off from the breather which should go back to the air filter housing (I've got an aftermarket pipe and cone filter on). From what I've read, at high boost that's supposed to send fumes back down to be recirculated into the turbo. Mine's not currently on, it's just a straight pipe from air filter to turbo, the third pipe is punched through the breather (bodge) and vents to air at the moment
I cant seem to find a new breather pot so I'm siliconing up the one I have til I find something that works. Be handy if those in the know could tell me what's needed and whether the one way valve is the right way round as the car's run funny for a while
Cheers
Andy
I want to check I've got everything piped up properly, because I know I'm missing a couple of things that I want to put back on
The head vents to the breather pot. That's OK.
What looks like the crankcase breather or inlet vent comes through a small pipe, into a one way valve and into the breather. The pipe, running right to left looks like this: ----<----¦----- where the < is the one way valve. Is that facing the right way?
Also, there's a third take off from the breather which should go back to the air filter housing (I've got an aftermarket pipe and cone filter on). From what I've read, at high boost that's supposed to send fumes back down to be recirculated into the turbo. Mine's not currently on, it's just a straight pipe from air filter to turbo, the third pipe is punched through the breather (bodge) and vents to air at the moment
I cant seem to find a new breather pot so I'm siliconing up the one I have til I find something that works. Be handy if those in the know could tell me what's needed and whether the one way valve is the right way round as the car's run funny for a while
Cheers
Andy
Quantum 2+2 1640cc CVH EFi Turbo
- andyquantum
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Re: EFi Breather Setup

im not saying this is correct but the valve seems to point to the engine and to me that means it aint doing s**t but the pipe is to big when i swap the valve pipe over so it would seem that what i think is wrong is the only way it can go
the car still idles at 1500 and it was recently set up and that was the lowest it could go to ,,it was closer to 2000 when the bailey breather was fitted
hope that helped to pickle your brain lol
- mikeymikeyp
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Re: EFi Breather Setup
Oh bugger, cheers!
Mine idles around 900 rpm when warm with the one way valve pointing away from the engine
Seeing as I cant find any CVH breather pots that are listed for Mk3 Fiesta I'm going to try hunt down a noname 3 way breather pot on the bay and see if that makes a difference
Mine idles around 900 rpm when warm with the one way valve pointing away from the engine
Seeing as I cant find any CVH breather pots that are listed for Mk3 Fiesta I'm going to try hunt down a noname 3 way breather pot on the bay and see if that makes a difference
Quantum 2+2 1640cc CVH EFi Turbo
- andyquantum
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- Your car: Quantum 2+2
Re: EFi Breather Setup
Think I've found the problem
The car is a Quantum, so was originally a N/A CVH from a Mk2, wouldnt have had all these extra pipes.
The washer bottle is fouling the pipe that comes off the bottom of the breather, this should make it's way back to the air intake after the filter, before the turbo. What looks to have happened is that the air intake pipe has pulled the bottom off the breather tank, because the pipe that leads from the bottom of the breather back to the turbo was too tight
I *think* I'm OK to blank this as I'm running an induction kit.
What was happening was the air filter piping was bent up and round to try and get the aftermarket filter in onto the wheelarch.
I should be OK with just having a generic breather pot which will vent the head, I think? So just having the small pipe with the one way valve to a breather and then out the head to the breather and another outlet that vents to atmosphere?
And nutsack to the recirculation back to the airbox area.
If someone could confirm that's not going to melt my engine and bring back Jedward that'd be cool


The car is a Quantum, so was originally a N/A CVH from a Mk2, wouldnt have had all these extra pipes.
The washer bottle is fouling the pipe that comes off the bottom of the breather, this should make it's way back to the air intake after the filter, before the turbo. What looks to have happened is that the air intake pipe has pulled the bottom off the breather tank, because the pipe that leads from the bottom of the breather back to the turbo was too tight
I *think* I'm OK to blank this as I'm running an induction kit.
What was happening was the air filter piping was bent up and round to try and get the aftermarket filter in onto the wheelarch.
I should be OK with just having a generic breather pot which will vent the head, I think? So just having the small pipe with the one way valve to a breather and then out the head to the breather and another outlet that vents to atmosphere?
And nutsack to the recirculation back to the airbox area.
If someone could confirm that's not going to melt my engine and bring back Jedward that'd be cool
Quantum 2+2 1640cc CVH EFi Turbo
- andyquantum
- Poster

- Posts: 121
- Joined: Wed Jun 25, 2008 9:46 pm
- Location: Lancaster, Lancashire
- Your car: Quantum 2+2
4 posts • Page 1 of 1