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PCV (Positive Crankcase Ventilation) - saga continues :)
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04-20-2011, 06:28 PM | #23 |
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After much thinking some decisions I've made:
1) capped off cv#3, no more blowby in intake manifold on decel/cruise/idle. Also no chance of crankcase being pressurized due to a possibly leaking cv#3. Really would be nice this cv was replaceable so we could upgrade it to eliminate a chance of leak. This is the mode of operation the car is in 90% of the time so it should really help with carbon build up. I'll clean the intake valves this weekend to start fresh. 2) Relocate OCC to driver's side so no 135deg bend and use widest possible tubing to/from it. 3) No VTA, recirculate back from OCC to intake to take advantage of vacuum there. Tap the BSH OCC with another outlet and tap the front intake tube for additional vacuum... 4) Hope that exhaust based scavenging isn't required. 2 reasons: if I get blue smoke out of tailpipe ever I want to know that there's an oil leak and not be misled into thinking it's blowby burning off. Other is smell and puffs of blue smoke..if it was a dedicated race car I wouldn't care, but it's not. 5) Definitely try to get a boost gauge on the crankcase somewhere to be able to monitor at least temporarily and go further from above setup if required. Question: what pressure should the crankcase see under idle/cruise/accel/decel ideally? Would whatever the engine sees when running stock boost be the goal OR would say a constant vacuum of 10-15inHg under any/all conditions be best (eg. impossible without an additional say belt driven vacuum pump).. Last edited by dzenno; 04-20-2011 at 06:35 PM.. |
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04-20-2011, 07:27 PM | #24 |
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Plumbing to exhaust is brilliant. Vibrant is located in the GTA (Mississauga) so access to parts to make this happen would be doable.
Dzenno, let me now if you need a hand with this project. |
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04-20-2011, 08:08 PM | #25 | |
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burn that extra oil off!!
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04-20-2011, 08:32 PM | #26 |
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Oh no way that's in my hood lol I'll have to at least try it out then...since I have a dual/split exhaust what do you think I install duals for extra vacuum? as long as these bumgs can be capped off later if I decide not yo use it I'm game...calling them tomorrow
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04-20-2011, 08:38 PM | #27 |
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Wow, Vibrant has a ton of stuff, never knew about them, and they're local! I have to try this lol
http://www.vibrantperformance.com |
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04-20-2011, 08:54 PM | #28 | |
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my 90 degree short radius cast aluminum elbow which has the ICV bung welded in the bottom and my Aquamist meth injection bung in the top. I have their silicone hoses and silicone vacuum lines all over the car as well. their ultra quiet resonator is great too, small and really helped smooth out the drone in my exhaust. its in the videos that I posted.
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04-20-2011, 09:01 PM | #30 | |
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see if they can modify one for a BMW fitting, would be perfect so you can then put it to your exhaust
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04-20-2011, 09:06 PM | #31 | |
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thats on the wastegate spring. There is no exhaust scavenging going on on this dyno so what you see is what you get. no smoke. I dont have a current picture as I have eliminated my McKinney catch can. You see the 3/4" heater hose coming off the front drivers side corner of the valve cover? Thats the stock location. In this pic its then going to my catch can and then to a modified m5 cylcone seperator which dumps oil back into the oil pan via the dipstick. It lets all air pass through and then its plumbed to my exhaust. Now its straight from the valve cover to the seperator (which doesnt do much but does help get some oil out) then to my exhaust. hope that helps. I am going to reintroduce my catch can after the seperator and locate it next to the tranny so its out of sight. Hoping that will eliminate any oil vapors altogether into the exhaust. I have not run the car with a OCC and the exhaust setup. For now though....its very liveable as is.
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Last edited by Sniz; 04-20-2011 at 09:22 PM.. |
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04-20-2011, 09:25 PM | #32 |
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So that dyno pull, was that with the OCC in place? Looks great!
I'm thinking OCC + tee off from the OCC to both exhaust pipes..what do you think? Would that make for higher vacuum? I'll talk to vibrant to see if they can fab an oil cap scavenger as that'd help me at least put a gauge there and see how the setup is doing crankcase pressure wise as boost is raised |
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04-20-2011, 09:31 PM | #33 | |
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yes I would T it with a AN fitting to get the full flow. Ask Vibrant though, i'm sure they have seen that type of setup.
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04-20-2011, 10:00 PM | #34 |
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I think this sounds great, and should be no problem blocking off CV#3 and just routing the blow-by to another vacuum source like your exhaust. How do you propose to block off #3 since its built into the valve cover?
When you tap into the exhaust, make sure you do it with a bung into the exhaust at a 45° angle, that way you get the most scavenging from the venturi forces. |
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04-20-2011, 10:46 PM | #37 |
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hey Dzenno: http://forums.bimmerforums.com/forum...hlight=vibrant
there is some gold in that thread for you
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04-20-2011, 10:55 PM | #38 |
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Hey Dzenno, can't wait to see the end product and any testing. How much vacuum is available by exhaust scavenging at low flow? Stock setup has high vacuum off boost from manifold. Looks like there's plenty of options under boost, and high exhaust flow, but this is different then stock. I'm sure many cars operate like this and it's no prob, but it would be nice to have confirmation. Reading cc pressure/vacuum is very important to prove this i think. Any luck rigging a gauge?
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04-20-2011, 11:13 PM | #39 | |
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04-21-2011, 07:27 AM | #40 | |
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Once I have some results on stock "limitations" only then I'll start making changes..really want to know where the car stands in stock form first in terms of all of this, if there really is crankcase overpressure under high boost, if the cv#3 leaks under high boost, at what point cv#2 is restrictive, etc |
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04-21-2011, 07:47 AM | #41 | |
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04-21-2011, 10:45 AM | #42 | |
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I don't think you need to test the checkvalves now if you are measuring vacuum, pressure... you'll know by the readings if there could be something wrong. Transferring your oil cap to a stock car would give further confirmation. |
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04-21-2011, 10:47 AM | #43 | |
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04-21-2011, 10:54 AM | #44 | |
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