Crank case vent with turbo
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Car: 87 GTA t-top
Engine: L98 350 w/RMT
Transmission: 700R4
Axle/Gears: 9 bolt BW 3.45
Crank case vent with turbo
Is keeping the pcv valve recommended under boost, should the pass side be left hooked up to the TB or just get a breather?
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Car: 87 Iroc
Engine: Turbocharged 5.7 Pro-Fl-XT
Transmission: 700R4 for moment
Axle/Gears: 3.25 9 inch
Re: Crank case vent with turbo
On mine, I put a breather on the passenger side and left the PCV valve hooked up the way it came stock.
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Car: 87 GTA t-top
Engine: L98 350 w/RMT
Transmission: 700R4
Axle/Gears: 9 bolt BW 3.45
Re: Crank case vent with turbo
Im not leaking just thought I might need a breather on the pcv valve side.
I think the check valve is a good idea as well, I have seen setups with either or.
Which inline check valves would work, Im only finding regular valves.
Thank you
I think the check valve is a good idea as well, I have seen setups with either or.
Which inline check valves would work, Im only finding regular valves.
Thank you
Last edited by transamice; 06-15-2010 at 10:31 PM.
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Re: Crank case vent with turbo
For valves with viton seals check this page:
http://www.usplastic.com/catalog/ite...3369&catid=489
Use the 3/8" or 5/16" ones for PCV and CCP. And the 1/8" ones to keep boost out of other areas. Such as the EGR, cruise, AIR solenoids, and ??.
RBob.
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#8
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Re: Crank case vent with turbo
I may try to go back to a PCV system on my setup. Right now I have both valve covers vented into a catch can with breather on the can. I dont think its working as well as it should. Had some oil come out of the valve cover grommets but I'm not using baffles which could be the problem.
Stock PCV valve I could easily blow air thru it with my own breath, let alone 15+ psi of pressure. So I scrapped the PCV idea for now, but would like to investigate it further. Just need a strong one way valve and maybe a filter inline so i do NOT suck in oil thru the motor.
Stock PCV valve I could easily blow air thru it with my own breath, let alone 15+ psi of pressure. So I scrapped the PCV idea for now, but would like to investigate it further. Just need a strong one way valve and maybe a filter inline so i do NOT suck in oil thru the motor.
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Engine: 3xx ci tubo
Transmission: 4L60E & 4L80E
Re: Crank case vent with turbo
I may try to go back to a PCV system on my setup. Right now I have both valve covers vented into a catch can with breather on the can. I dont think its working as well as it should. Had some oil come out of the valve cover grommets but I'm not using baffles which could be the problem.
Stock PCV valve I could easily blow air thru it with my own breath, let alone 15+ psi of pressure. So I scrapped the PCV idea for now, but would like to investigate it further. Just need a strong one way valve and maybe a filter inline so i do NOT suck in oil thru the motor.
Stock PCV valve I could easily blow air thru it with my own breath, let alone 15+ psi of pressure. So I scrapped the PCV idea for now, but would like to investigate it further. Just need a strong one way valve and maybe a filter inline so i do NOT suck in oil thru the motor.
I tried one on a log manifold to record EBP and it only lasted less than 50 hours. Water/alky and condensation in general destroyed it, but it worked long enough to record the EBP via the ECM to compare against intake PSI, TPS, etc.
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Car: 87 Iroc
Engine: Turbocharged 5.7 Pro-Fl-XT
Transmission: 700R4 for moment
Axle/Gears: 3.25 9 inch
Re: Crank case vent with turbo
With my 9 psi setup I'm not seeing any significant problems with oil coming out. Certainly on the passenger side breather, there is no oil. There is a slight filming of oil on the valve cover around the filler cap that builds up over time. That's using a standard PCV valve. Perhaps you could use two PCV valves - one of those in-line types and then the stock PCV that goes into the valve cover grommet. What little bit of pressure leaks past the in-line would then be more easily stopped by the second PCV.
#11
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Re: Crank case vent with turbo
On my buddy's turbo Chevelle (blow-through carb system) we used Mopar-style breathers in both valve covers (that have hose nippes on the top) and then ran hoses from the beathers over to a catch can. Works flawlessly.
Never tried it with a PCV system, but if we ever did we would certainly look for some kind of one-way valve to put in the line. A standard PCV valve will DEFIN ITELY allow considerable back-flow into the engine. Just blow through one in the same direction that boost would be trying to go and you'll see what I mean.
And if it's a blow-through carbureted setup it would be air and fuel back-flowing into the crankcase. That risk didn't seem like a good idea to us which is why we went with dual breathers and a catch-can.
Never tried it with a PCV system, but if we ever did we would certainly look for some kind of one-way valve to put in the line. A standard PCV valve will DEFIN ITELY allow considerable back-flow into the engine. Just blow through one in the same direction that boost would be trying to go and you'll see what I mean.
And if it's a blow-through carbureted setup it would be air and fuel back-flowing into the crankcase. That risk didn't seem like a good idea to us which is why we went with dual breathers and a catch-can.
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Re: Crank case vent with turbo
If you had a cheap 2-bar map sensor on it you could tap in different areas to see how well it is working. If the map takes in a fair amount of oil then it may be destroyed or may just need to be cleaned out.
I tried one on a log manifold to record EBP and it only lasted less than 50 hours. Water/alky and condensation in general destroyed it, but it worked long enough to record the EBP via the ECM to compare against intake PSI, TPS, etc.
I tried one on a log manifold to record EBP and it only lasted less than 50 hours. Water/alky and condensation in general destroyed it, but it worked long enough to record the EBP via the ECM to compare against intake PSI, TPS, etc.
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Re: Crank case vent with turbo
Most OEM's put the outlet of the PCV breather into the inlet of the turbo so it can be sucked through. I personally dont like the idea from a performance standpoint due to the heat and potential detonation issues.
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