Silent Posted April 18, 2006 Share Posted April 18, 2006 alrighty, not sure of the techy term for it, but the vent tube at the top of the valve cover. i have seen people use aeroquip fittings {or fittings of their choice} for a better looking install. what size is this sucker anyways? Quote Link to comment Share on other sites More sharing options...
zguy36 Posted April 18, 2006 Share Posted April 18, 2006 It is a pcv breather tube. Quote Link to comment Share on other sites More sharing options...
thehelix112 Posted April 18, 2006 Share Posted April 18, 2006 I fought with this a while back as well. Noone could tell me what thread it was, and I went to over 6 plumbing stores. In the end I just brought an appropriate tap (1/2 BSPT rings a bell but I couldn't be sure) and tapped it out to a more standard thread. Dave Quote Link to comment Share on other sites More sharing options...
zercs280zx Posted April 18, 2006 Share Posted April 18, 2006 K&N model: 62-1340 If you want something different, or to compare to, the dimensions on that model are: 5/8" flange.........2" Filter diameter...........1 1/2" height it has a rubber bottom and chrome top... I found it at summitracing Quote Link to comment Share on other sites More sharing options...
Silent Posted April 18, 2006 Author Share Posted April 18, 2006 im looking to take the stock tube out, and put a aeroquip/russel/earls style fitting on it. the filter im not worried about. i get thats for 2 bucks all day long. Quote Link to comment Share on other sites More sharing options...
zguy36 Posted April 18, 2006 Share Posted April 18, 2006 Join Date: Jul 2005 Location: Melbourne Posts: 452 I fought with this a while back as well. Noone could tell me what thread it was, and I went to over 6 plumbing stores. In the end I just brought an appropriate tap (1/2 BSPT rings a bell but I couldn't be sure) and tapped it out to a more standard thread. Yours is threaded? Mine is just a hose fitting.... Quote Link to comment Share on other sites More sharing options...
zercs280zx Posted April 18, 2006 Share Posted April 18, 2006 I read that too quickly, I was thinking filter.... my pcv is threaded into the valve cover... one of mine broke, so I had to back it out... what exactly do you want to replace it with? It still acts like a pcv, right? It's not just a straight tube going to a filter, right? I wasn't sure there was an alternative to the old oem pcv valve... let me know if you come up with anything.... Quote Link to comment Share on other sites More sharing options...
thehelix112 Posted April 18, 2006 Share Posted April 18, 2006 zguy36, My hose 90 degree hose fitting unscrews. Can see the speedflow (-AN) fittings on there. Dave Quote Link to comment Share on other sites More sharing options...
dj paul Posted April 18, 2006 Share Posted April 18, 2006 the pcv valve in a perfect world creates a vacuum environment in the valve cover. ive read a writeup on this that i couldnt find (ill post it if i can). objects in a vacuum can move a lot more freely than in atmosphere so you want to vent this thing into either the intake or the exhaust. the latter being the better of the two because at WOT the intake no longer acts as a vacuum. as you will notice though, most stock applications will vent into the intake because its easier. (most of the time). ive seen tons of people just vent it to open air though, but i would vent it to exhaust. if you vent it to intake make sure you install a little catch can. but whatever you do. do NOT plug the vent, your valve gasket will most likely fail. Quote Link to comment Share on other sites More sharing options...
Silent Posted April 18, 2006 Author Share Posted April 18, 2006 zguy36' date=' My hose 90 degree hose fitting unscrews. [img']http://ozdat.com/forum/files/turbo-z-bay_209.jpg[/img] Can see the speedflow (-AN) fittings on there. Dave the fitting in the valve cover, exactly in that pic is what im lookin for! is it an 8 or 10? guess it really doesn't matter what thread it is, since i believe you have to tap it anyways Quote Link to comment Share on other sites More sharing options...
Tony D Posted April 18, 2006 Share Posted April 18, 2006 The hose is a 15mm CONDUCTIVE rubber hose. -8 will work fine for it if you need it, -10 would be an appropriate size (and technically correct, as well). Tap the hole, it's easier, the thread on it is a very fine obscure metric equivalent like the banjo bolts in Weber Carbs or the water lines on the turbo.... But a nice NPT runs right down there and solves that problem. So does any of the positionable MS-Jamnutted fittings, as well! Quote Link to comment Share on other sites More sharing options...
Silent Posted April 18, 2006 Author Share Posted April 18, 2006 thank ya Mr Tony Quote Link to comment Share on other sites More sharing options...
Dan Baldwin Posted April 18, 2006 Share Posted April 18, 2006 For the record, the pcv valve goes between the intake side of whatever throttle(s) you have to the crank case. The thingie on top is only a vent, it's not acting to draw a vacuum inside the valve cover, which would do nothing for you. A vacuum in the CRANKCASE, however... Quote Link to comment Share on other sites More sharing options...
JMortensen Posted April 18, 2006 Share Posted April 18, 2006 Really? What about that big ol' hole in the front there where the timing chain goes. No pressure gets through that big hole? I agree that the crank vent is the one that should get vacuum if one of them is going to, but to say that the valve cover vent is TOTALLY unrelated is false IMO. Quote Link to comment Share on other sites More sharing options...
Dan Baldwin Posted April 18, 2006 Share Posted April 18, 2006 That "big ol hole" does not go to the crankcase, only to the space between the front of the block and the timing cover. Quote Link to comment Share on other sites More sharing options...
Dan Baldwin Posted April 18, 2006 Share Posted April 18, 2006 Then again, when you pour in oil, I guess it's gotta get into the crankcase SOMEhow! Quote Link to comment Share on other sites More sharing options...
thehelix112 Posted April 19, 2006 Share Posted April 19, 2006 The large drain hole at the back of the head perhaps? Dave Quote Link to comment Share on other sites More sharing options...
Dan Baldwin Posted April 19, 2006 Share Posted April 19, 2006 Ah yes, the large drain hole in the back of my head... Quote Link to comment Share on other sites More sharing options...
zguy36 Posted April 19, 2006 Share Posted April 19, 2006 You don't want too much vacuum in the crank case as it draws air in through the main seals. This is very bad since it brings dirt with it chewing up the seals and contaminating your oil. The stock location for the breather tube works well, which in reality just went into the air inlet tube after the AFM. This is the inlet for the pcv and should be able to draw air in through this hole. To see what I am saying, pop off the hose and put your finger over the hole. You will feel it pull a vacuum.... Quote Link to comment Share on other sites More sharing options...
Mr.INSANE Posted April 19, 2006 Share Posted April 19, 2006 As long as you dont put just a filter you will be good take in mind valve cover filter breathers are also illegal but im guessing theres already illegal stuff on your car Quote Link to comment Share on other sites More sharing options...
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