Why isn't this PCV/Vent setup working!
11-21-2008, 12:19 PM
#1
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Thread Starter
Join Date: Jun 2007
Posts: 20
Why isn't this PCV/Vent setup working!
I'm tired of driving the car and smelling like oil, so therefor I want a working PCV system again.
If I leave the system attached as is I get pressure in my crank case that blows oil out the rear vent when i'm on higher boost (12+ psi). I've done a leakdown on the car and get anywhere between 3-5% and the compression is even (190) across the board.
When in boost the front PCV is snapped shut (pressure tested to 20+psi, no problem, no leakage) and pressure just builds so fast that I have to have more than just that rear vent for it to escape. It seems no matter what the throttle there is NO vacuum on the turbo intake hose. In fact it seems to trap the combustion gasses and compound the problem.
I want to know why there is no vacuum on that rear vent hose when I'm on the throttle....
If I leave the system attached as is I get pressure in my crank case that blows oil out the rear vent when i'm on higher boost (12+ psi). I've done a leakdown on the car and get anywhere between 3-5% and the compression is even (190) across the board.
When in boost the front PCV is snapped shut (pressure tested to 20+psi, no problem, no leakage) and pressure just builds so fast that I have to have more than just that rear vent for it to escape. It seems no matter what the throttle there is NO vacuum on the turbo intake hose. In fact it seems to trap the combustion gasses and compound the problem.
I want to know why there is no vacuum on that rear vent hose when I'm on the throttle....
11-21-2008, 12:51 PM
#2
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Join Date: Dec 2005
Location: Casper Wyo.
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Re: Why isn't this PCV/Vent setup working!
Since you have no vacumn between the turbo and air filter then congrates you have free enough flowing air filter.
As vor the pcv valve you may need a catch can setup, vacumn pump, or the to supra tt pcv setups.
The latter setups were discussed in this thread https://www.homemadeturbo.com/forum/...?topic=96426.0 the supra tt pcv was towards the end of this link.
For the catch can setup https://www.homemadeturbo.com/forum/...opic=41175.100 but the pictures are gone until you get to page 3.
Good look what is your setup?
What engine in what car?
As vor the pcv valve you may need a catch can setup, vacumn pump, or the to supra tt pcv setups.
The latter setups were discussed in this thread https://www.homemadeturbo.com/forum/...?topic=96426.0 the supra tt pcv was towards the end of this link.
For the catch can setup https://www.homemadeturbo.com/forum/...opic=41175.100 but the pictures are gone until you get to page 3.
Good look what is your setup?
What engine in what car?
11-21-2008, 01:13 PM
#3
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Join Date: Jun 2007
Posts: 20
Re: Why isn't this PCV/Vent setup working!
The engine is a 2.5L V6 fully built Mazda KL engine with a 60-1 Turbo.
My old KLZE didn't have this problem, but I also didn't give a ---- about that motor.
I had a CDM catch can on the car for a moment but took it off because I needed to drill out the opening as it was like a 1/4 in!!! I eleminated it for now until I could solve the current issue and then it'll be restored. For now I have the rear vent going into a Gatorade bottle with some duct tape so I can keep tabs on how much oil actually blows out.
Last time I had the system connected as shown above except the rear valve cover was just vented I manged to splooge oil all over the firewall after too pulls at 14psi. So that leads me to believe pressure just wasn't escaping fast enough.
EDIT:
I've already read that smog pump thread and it definitely is on my to do list....
My old KLZE didn't have this problem, but I also didn't give a ---- about that motor.
I had a CDM catch can on the car for a moment but took it off because I needed to drill out the opening as it was like a 1/4 in!!! I eleminated it for now until I could solve the current issue and then it'll be restored. For now I have the rear vent going into a Gatorade bottle with some duct tape so I can keep tabs on how much oil actually blows out.
Last time I had the system connected as shown above except the rear valve cover was just vented I manged to splooge oil all over the firewall after too pulls at 14psi. So that leads me to believe pressure just wasn't escaping fast enough.
EDIT:
I've already read that smog pump thread and it definitely is on my to do list....
11-21-2008, 01:51 PM
#5
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Join Date: Dec 2005
Location: Casper Wyo.
Posts: 0
Re: Why isn't this PCV/Vent setup working!
Originally Posted by radar
Do you have any info on the TT Supra PCV...I just see it mentioned, but nothing more.
But I'm leaning towards that setup for my twincharge d16z6 in eg setup.
11-21-2008, 02:27 PM
#6
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Join Date: Feb 2005
Posts: 258
Re: Why isn't this PCV/Vent setup working!
some people put another check valve in line with the pcv or go to a pcv from a forced induction car.
On my setup (5.0 mustang), I just vent both valve covers and the place where the pcv goes to oil separators and then to the turbo inlets.
Erich
On my setup (5.0 mustang), I just vent both valve covers and the place where the pcv goes to oil separators and then to the turbo inlets.
Erich
11-21-2008, 02:58 PM
#7
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Join Date: Jun 2007
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Re: Why isn't this PCV/Vent setup working!
the PCV is from a boosted car...actually the Millenia S (miller cycle) so I know it can withstand the pressure and flow enough. The valve has also been pressure tested and doesn't leak.
11-21-2008, 03:39 PM
#9
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Re: Why isn't this PCV/Vent setup working!
I'd like to daily drive the car some more and I can't smell like an oil change when I get to work which is the reason i'm looking into this.
I could always just vent them to air, but even with it routed under the car, the vacuum created by the windows being open (no a/c) will just suck the fumes back in.
I could always just vent them to air, but even with it routed under the car, the vacuum created by the windows being open (no a/c) will just suck the fumes back in.
