CCV is "closed," but how does it vent...? - JeepForum.com

 
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post #1 of 6 Old 05-24-2013, 12:13 PM Thread Starter
westnewton
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CCV is "closed," but how does it vent...?

PCV I think understand... One bank has an outlet and PCV under slight vacuum from the intake to "pull" gases out. AND, it has an inlet on the opposite bank that allows air in to top of the engine which creates a cross-draft-ish-type effect to pull gasses from both halves of the "V"

CCV is a closed crankcase ventilation. Obviously there are plenty of issues with sucking oil mist into the turbo inlet, which has been discussed in detail.

My question is: Where does the "inlet" part of this ventilation occur as it does with PCV systems? Since it is closed, I am guessing there is some sort of pressure diff on a boosted engine that helps push vapors out??

Either way, I am keeping the system "closed" by routing the CCV outlet into the bottom of the airbox, which will still provide a small vacuum.


07 WK CRD. GDE-Eco. DPF "Flow Improvement" MIA Resonator. CCV routed to airbox pre-filter. Black turbo inlet tube.
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post #2 of 6 Old 05-24-2013, 12:15 PM Thread Starter
westnewton
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Also... A large reason I have enough information and wisdom to even begin messing with my first diesel engine is due to this forum. Thank you to all who contribute!!!!!

07 WK CRD. GDE-Eco. DPF "Flow Improvement" MIA Resonator. CCV routed to airbox pre-filter. Black turbo inlet tube.
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post #3 of 6 Old 05-24-2013, 01:24 PM
suzieque
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I'm not sure what you are asking. The engine air input comes from the air intake itself to the front of the turbo where the air is compressed. During the combustion process, most of the gas goes out the exhaust pipe but some exhaust escapes past the piston rings, thereby increasing the crankcase pressure. The CCV allows the excess air pressure to escape the crankcase back to the air intake.

2008 WK "S" Limited bright metallic silver exterior, light graystone interior, 5 speed W5J400 transmission, June 18/2008 build, C213RE rear differential with 3.73 axle ratio, C200FE front differential with 3.73 axle ratio, 245/60R18 Goodyear Fortera tires (stock summer tires), NV245 transfer case, GT2056V turbo, 3.0L CRD (OM642.980)
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post #4 of 6 Old 05-24-2013, 03:32 PM Thread Starter
westnewton
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Maybe that blowby is it?

On all of the gas cars I have had (11), the PCV was on one side (or bank, or half) of the engine, and the other side had a fresh air tube to bring in outside air. This allowed the PCV pull air out one side of the engine while the other side let fresh air into the top of the engine and "flow" across both halves to pull out the blow-by gases.

Since the CRD is presumably a closed system, there must not be a fresh-air in, but rather they rely on the blow-by gases to create enough positive pressure to flow out the CCV valve.

Does that mean these rings let by enough air, or blow-by, that no fresh air source is needed?

07 WK CRD. GDE-Eco. DPF "Flow Improvement" MIA Resonator. CCV routed to airbox pre-filter. Black turbo inlet tube.
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post #5 of 6 Old 05-24-2013, 06:33 PM
suzieque
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Ok, I think I understand your question now. My understanding of forced induction engines is that they do not have an unvented/unrestricted air intake on their crankcases. So even a gas engine with a turbo or supercharger will not have an open breather on the opposite side of the engine. Have you started your crd and opened the oil fill cap while it's idling? If so you will see a mess quickly form around the oil fill hole as the crankcase pressure, even at idle, have a new way to escape and make a mess.

2008 WK "S" Limited bright metallic silver exterior, light graystone interior, 5 speed W5J400 transmission, June 18/2008 build, C213RE rear differential with 3.73 axle ratio, C200FE front differential with 3.73 axle ratio, 245/60R18 Goodyear Fortera tires (stock summer tires), NV245 transfer case, GT2056V turbo, 3.0L CRD (OM642.980)
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post #6 of 6 Old 05-28-2013, 07:21 AM Thread Starter
westnewton
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Thanks! My previous vehicles were NA and I'm still learning about the changes that come with a turbo.

07 WK CRD. GDE-Eco. DPF "Flow Improvement" MIA Resonator. CCV routed to airbox pre-filter. Black turbo inlet tube.
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ccv , turbo , vent tube breather

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