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Is this a proper PCV system?
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04-30-2020, 03:50 PM | #23 | |
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This is what I have. Flapper valve to catch can to rear inlet On the PCV side I have the PCV delete fitting followed by external PCV. Ir goes to a catch can then goes to a T fitting on the vacuum line that connects to the throttle body. I’ve seen other run that set up but now I’m getting fuel mixture codes and I’m not sure if they’re related to the extra vacuum the throttle body line is pulling. |
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04-30-2020, 04:04 PM | #24 |
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First, lets try and understand not only what causes excess carbon build-up but ways we can minimize it, if not eliminate its presence all together. Often it is largely a factor of the way the ECU is programmed to inject the fuel into the cylinder.
We know that short distance driving causes extra buildup because the engine runs richer and internal tolerances are not yet perfect since metal expands once it reaches a certain temperature. Not only will lots of stop and go as well as aggressive driving increase this, but doing frequent short trips (turning the engine on and off many times in a short period of time is also known to cause buildup.) We know that aggressive driving CAN cause buildup because quality of fuel is poor which means an excessively rich air/fuel ratio. The reason why giving her an occaisonal italian tune up can help clear out carbon deposits (provided they are still fairly minor) is because 2-3 repeated pulls to near redline will heat up the intake ports enough to remove some deposits within the engine. The main reason; in my eyes is the oil being used. It boils down to what sort of additives are added to the oil supply which help combat the process of oil shearing once fuel begins to dilute the oil in your crankcase. So while the correct additives is key, its also important to use a sufficiently thick oil weight as this will help further limit the process of oil breaking down and also ensure a better seal between the cylinder wall and piston ring which is crucial at limiting fuel dilution - which consequently causes blow by... and carbon buildup. Lastly; let's not forget that the oil also passes through the turbocharger which means it is being subjected to an insane amount of stress and shearing force. this highly increases the need for good quality oil of a sufficient weight. |
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05-26-2020, 03:17 PM | #25 | |
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Think I finally did it right
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05-26-2020, 04:02 PM | #26 |
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Nice! It is a lot cheaper if you block the head ports rather than the PCV delete I used.
I’ve had my system on for about 500 miles. I can’t notice anything different. The other day smoke was coming out of the exhaust for some reason. Hasn’t smoked since. Odd. The PCV catch can is catching oil. The inlet catch can isn’t catching much I think. |
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05-26-2020, 04:35 PM | #27 | ||
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Personally I kept my flapper valve to rear inlet stock as I'm running the RB external PCV setup. I could do a high side catch can for catching blow by while in boost but from what I've seen from others they don't catch much oil, if any. Just don't know if it's worth the $150+ for a high side catch can to catch negligible blow by
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05-26-2020, 05:45 PM | #28 | |
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This was my first engine rebuild ever so I took my time and learned a lot. I just overlooked/forgot to take care of the PCV system properly. I am currently (2 weeks now) running 22lbs of boost on TD04-17T turbos and it has not blown up yet, so I must have done something right. |
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05-26-2020, 06:21 PM | #29 | |
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05-26-2020, 07:52 PM | #30 |
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I mean the the 6 little passages that feed oil down from the valve cover to the 6 intake ports. I think that may also be what you are describing. I now run an external PCV. It is literally between the stock cap I cut and added a barb to, and the oil catch can. I have each end of it shoved into the two hoses that go between the valve cover and can.
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05-26-2020, 08:06 PM | #31 | |
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It is definitely not worth a $150.00 catch can, which is why I bought one for $19.90 that is just as good as the other ones. |
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05-26-2020, 08:45 PM | #32 | ||
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05-26-2020, 11:33 PM | #33 | |
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Have you caught any oil on the high side catch can? Last I checked, I was about 100 miles in and the high side was bone dry and the low side had some oil in the catch can. I haven’t blown anything yet at 18-19 psi so it must too be working! I know you asked JonE, but I’ll share what I did and what I used. I made an in depth install video that still has to be edited if anyone is interested in viewing it, I’ll get on that. 2’ of 3/4” hose from auto parts store. ~$11 5’ of 3/8” fuel/vapor hose from auto parts store. ~$17 Pack of various T fittings for 3/8” hose -$6 VTT PCV delete fitting $40 RB internal PCV valve(used externally) $40 Low side catch can $20 https://www.ebay.com/itm/Cylinder-Al...72.m2749.l2649 High side catch can. Was $20 when I bought it. https://www.ebay.com/itm/Billet-Alum...4AAOSw0~5en-~C Then some hose clamps and aluminum plate I had to mount it. Yikes, added up quickly! This set up didn’t require plugging the head ports, but still bypasses them. If you have your VC off, then JonE’s way would be cheaper because you’d save on the VTT PCV delete. Looks like this now.
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05-27-2020, 06:10 AM | #34 | |
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That way the occ is not pressurized each time the intake man sees boost.
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05-27-2020, 12:50 PM | #35 | ||
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05-27-2020, 09:26 PM | #36 | |
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The first link, which would be the side catching most of the oil came with a dipstick to check oil level and the various fittings it came with accommodated the 3/8” hose needed for the TB vacuum line and the PCV valve. I used this set up because I didn’t want to take the valve cover off and plug the head for now. |
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05-28-2020, 10:53 AM | #37 |
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Hmmmm. That may be a good idea. I assumed it was good to have it as close to the crankcase as possible but if it doesn't matter then after the OCC would be a good idea.
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05-28-2020, 10:55 AM | #38 |
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(Serf27) I like the location of the front can with a bracket off the manifold. I may do that. My low side can is still just tie strapped in while I decide where to permanently mount it.
P.S. to the question of how that hose will hold up to boost. I am not sure it will last forever but I like being able to SEE the oil before it gunks up my valves. It collapsed under vacuum but a long spring inside the hose took care of that. Last edited by JonEQuest; 05-28-2020 at 11:06 AM.. |
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05-28-2020, 11:44 AM | #39 | |
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I drilled a hole in the stud that holds the stock air box. The spring in the hose is great! I’m probably going to add a clear hose too. Cleaning those valves was a pain. |
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05-28-2020, 12:23 PM | #40 | |
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05-28-2020, 12:32 PM | #41 | |
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I cleaned them the same way you did. It took a while and made a bit of a mess. I let the cleaner sit overnight then used a soap bottle pump to pump out any cleaner. I then blew air into the valves while using the wet vac to suck up anything blowing out. Left them clean but what a pain. Hopefully these catch cans help out! Last edited by Serf27; 05-28-2020 at 01:18 PM.. |
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07-09-2020, 01:23 PM | #42 | ||
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03-12-2021, 12:19 PM | #43 |
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I changed my oil the other day.
It’s been about 8k miles with the catch cans, I think, I didn’t keep track. Both cans have been catching oil, even the rear which I was told would do nothing by my friend. The rear inlet can didn’t have much. The front can attached to the throttle body and pcv had a lot. I’m not sure if I should be concerned with how much it caught or if it’s normal. The stock diverter valve vacuum nipple on the intake manifold is now being used for a bov. The line to the bov is clear. Itlooks like some oil/fumes are still making it into the intake by the looks of the clear hose. Here are some photos. First photo is can between rear inlet and flapper on the VC Second photo is of can between pcv and the throttle body vacuum line. Third photo is the dipstick from the front can with the screwdriver marking where the oil level was at. Fourth photo is of the clear bov line. I was also using the inline air filter for the bov line, it had oily residue and the small filter broke in half when I grabbed it. Probably due to the oil in it. I think oil is still getting into the manifold.
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09-15-2021, 10:22 PM | #44 |
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I had to pull my intake manifold off to replace the starter. I took a look at the valves and they look as if there isn’t any catch can in place or as if the pcv delete (which blocks off the passage to the head ports) is not working.
My catch cans are still catching oil, but the valves looked dirty and there was a trace amounts of oil in the charge pipe/throttle body. Now these valves, I cleaned very well last year. I didn’t Keep track of the mileage, but I’d say this is about 10-15k worth of miles. What gives? |
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