What is the large hoses coming from the rear half of the valve covers on a Titan? I have a 2014 Pro4X, although every Titan that I have saw had the same valve covers. I see the PCV fitting in the center of the valve covers but cannot find what the larger diameter fitting closer to the firewall is/does. Thx
Titan Valve Cover Plumbing
PhantomStranger
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What is the large hoses coming from the rear half of the valve covers on a Titan? I have a 2014 Pro4X, although every Titan that I have saw had the same valve covers. I see the PCV fitting in the center of the valve covers but cannot find what the larger diameter fitting closer to the firewall is/does. Thx
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The hoses that route from the mid-back of the valve covers toward the front? They are breather hoses - one each side, part of the PCV system - and connect to the air intake, after the MAF. That way, any air that is needed to ventilate the crankcase is measured, flows through the hoses you are asking about, and returns to the intake through the PCV valve.
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Yes, that is the hoses. I have read several posts about the oil catch can install but no mention of them. I am thinking of installing a OCC. If i tie both PVC hose together with a Y fitting them to the OCC then split it again on its way back to the PVC inlets, will that have any negitive effect?
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I would be splitting the hose again from the OCC to the fittings on the intake. If that makes sense.
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If I'm understanding, what you are proposing is the typical setup. Here's a good thread that shows correct hose routing. https://www.titantalk.com/forums/titan-general-discussion/347922-proper-installation-oil-catch-can.html. Search the forum for Oil Catch Can Install and you will find other threads as well.
You really don't need to do anything with the two breather hoses you were worried about, although you could add a second OCC to that path as well. I've seen Chevy V8 setups that run a second can on the "inlet" side. Probably overkill, since flow is normally into the crankcase on that side. Just needs to be a separate can if you go that route.
There are lots of good OCCs and there are lots of cheap ones that really aren't designed right. Do some research on the cans before you select one. There are three-port cans (usually two inlet, one outlet) that can save you one tee, as well.
Hope this helps.
You really don't need to do anything with the two breather hoses you were worried about, although you could add a second OCC to that path as well. I've seen Chevy V8 setups that run a second can on the "inlet" side. Probably overkill, since flow is normally into the crankcase on that side. Just needs to be a separate can if you go that route.
There are lots of good OCCs and there are lots of cheap ones that really aren't designed right. Do some research on the cans before you select one. There are three-port cans (usually two inlet, one outlet) that can save you one tee, as well.
Hope this helps.
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