Finally, no more smog checks on my car, finally I will rid my car of all that junk(smog crap). I 've been busy, but, what happened today gave me the willpower to engage this job ASAP!
I have all the smog crap connected, even my Weber 32/36 without the Weber air filter, but with that cacerole of the stock air filter...(It is a genuine air filter by Datsun, no offense, but no place when performance and efficiency is sought)...on it, what an insult to the Weber carby!
I have not been using my Datto too much this summer, using the jeep instead(hot weather, time for no doors cars!)...well, this morning, while starting my Datto, proud as I am about it, in front of some pedestrians, to my horror, I see a cloud of blue smoke comming out of the pipe, man!, I though, it can not be, this is not water vapor(as in a blown gasket)...never a problem , what is this about? turned the engine off, back on again, and the puff was gone.
Drove the Datto, and, no problems, everything oK, what happened was that the car was parked in an incline, so the oil that enters the intake manifold via the PCV valve, which accumulates on the bottom of the manifold,after long time(not a lot, but there is some always) due to the inclination of the car, overnight, moved towards the front cylinder, so, at starting the engine, it got sucked into the combustion chamber, making all that scene, embarrasing, my powerfull Datsun puffing out smoke like a coffeepot. Never again. I already bought on my way home a Weber air filter, and later on will rid my car off all the unnecesary crap, including the PCV valve, both valve cover and engine exits will go into a breather box, with its own reservoir for blow by oil stuff.
No more trash into my engine. Both hoses into a breather tank , breather tank has its air filter, so that clean air can go in, bad air can go out, and oil stays trapped in the box.
JAime.++++++++++++++++

you must park on quite an incline. I've never had oil run up into the air intake.

supposedly, the PCV also helps the rings seal better, and definitely doesn't hurt anything.

The PCV valve will keep your oil cleaner. If you wanted to replumb it so that your oil problem doesn't happen, that'd be cool but I don't think I'd remove it altogether. 'Course you could just use a road draft tube and spew the blowby all over the underside of your car. That's what we did with rigs before the mid 60's.

Hy. The only reason the PCV valve exists is to not allow blow by bad air and oil go to the atmosphere,...( which is a good thing for the enviroment, I do not advocate to have no PCV systems, all new cars must have them, but we Datsun fans are a small number, we will not make a dent in the pollution problem)...instead it is sucked into the intake manifold, and burned within the combustion at the pistons. For efficient combustion, the cylinder needs good spark, clean cool air and vaporized gas, oil, bad oxigen depleted air is not requiered nor healthy for proper efficient ignition/combustion. On the other hand, the hose from the rocker cover to the carburetor is sending(at low vaccum,like at full throtle,full speed, when the PCV valve is closed due to this low vaccum at manifold that can not open the PCV valve , thus blow by from crancase can not exit engine via PCV valve into manifold )...trash, oil, hot oxigen depleted air into the carby due to the fact that this bad air has to go somewhere, when the PCV door is closed, it exits the engine via this connection to the air filter, making your carby less efficient, dirty and hot. This is a pollution concern, not a engine efficiency one. Race engines have this exits connected to breather boxes like I mentioned before.The oil will not flow off from the car onto the road at all, that is why there are breather boxes, it is a box , with the air filter element on top, to allow clean air in, the bad air out, but the oil(oil mist)... will remain inside the box, box which would have to be cleaned accordingly as maintenance every once in a while. You mentioned that the PCV valve is good, and I agree, if the ventilation of the engine is going to be closed(recirculating pattern as in the PCV system, yes, it makes sense, but the open system(as in race cars)is better for the engine, you do not need to recirculate bad air, it just goes out of the motor, and the reservoir/box stores the oil.The engine breathes naturally, the engine needs no PCV valve, it just needs to breath, but if the plan is to recirculate this stuff, send it into the combustion chambers, then, the only way to do so is to install a valve that will allow this stuff to go into the intake manifold.
What your engine needs is not exactly what the pollution guys have in mind.
About the incline, yes, it was inclined, and,it is not like there was a lot of oil, it only takes a small amount of it to be in the intake manifold, and a small amount to be sucked in into the piston(s) to create a small blue smoke, but think about it, what good is the oily, hot, heavy air going to do for your efficiency and performance, all your car needs is cool clean air and vaporized gasoline.
If performance is the goal, PCV has to go, if not really concerned with efficiency and performance, the PCV system is just fine.
JAime++++++++++++++++++

Quote:

love that reasoning.

so if everyone walks around thinking "i'm just a small part of the problem" then we'd be back to square one, wouldn't we...?

you're lucky, you have an ozone layer so you can enjoy your summer sun and stay oblivious to the rest of the world. so how about helping stop this hole becoming bigger and killing aussies in the process and refit your pollution controls huh?

I don't believe you're going to have a measurable difference in power between no PCV and a PCV. If you're getting that much oil up top, I think you've got other issues like rings or valve guides or a blocked line. An engine is nothing more than an air pump. All the air that goes in, has to go out. It moves around in the crancase too. A good PCV, good baffles and a good filter will do wonders and it will be virtually trouble free. Llike 240 said,no need to blow a hole in their ozone. That's my 2 cents anyway. Stepping off my soapbox now...

Pro240c:
I knew I was going to find somebody bringing the pollution issue on. I am not here to talk about pollution, but about performance of an engine. When I wrote that which you quoted, I meant it, because all cars today are manufactured with PCV systems, and I agree, first, because we got to keep the air clean( the Ozone layer problem is due to other reasons btw, like freon gas)...and also todays technology made these engines(modern) with this pollution devices taken into account. Todays cars are powerfull, because the pollution devices where considered in the building process, minimal effect on performance. Our cars are from the past early seventies, engines which were designed and built with technology pre/smog pollution devices, these devices where added on, hindering on performance. Here in Ca, US, the amount of devices added is impresive, and the detrimental effect on the performance of the engine is incredible. Added to that, there are no new factory made replacements for these parts, so, cosmetically, you might think the engine has all its devices(pollution) in place, but those parts, after 30 or so years,are just a metal egg shell, inside, the function is very deficient, is any at all. When I wrote we Datsun fans, I meant it, how many 1200 or B210's do you think you can find on the road today? out of all those, how many are kept efficient and checked by an enthusistic owner? I can assure you I am probably the only B210 with open (as known in the racing world)...ventilation system driving around the county, if not the state, that is what I mean by no dent, and like I mentioned before, I am not advocating to rid all cars of PCV systems, only fellow Datsun fans with older 70's cars who share the passion of performance and efficiency with their small powerplants. I would not advice the owner of a 350Z, Subaru Imprezza, Corvette, Mazda RX8, Ferrari, Porsche,(or any other new car model) etc to rid their cars of pollution devices, not only because it is not right, but because it would be unnecesary performancewise, those cars perform excelent with those devices in place.It is not needed, either enviromentally nor performance wise. My advice is just that, advice for a Datsun built in 197something, if you do not like it, do not follow it, but do not turn this into what it is not, I am not a pollution monger or anything like that. Do not twist my insight.
Thanks.______________________

Let's face it. A 1200 in perfect tune, with all the emissions gear on and in working condition, pollutes 100 times more than a new car. So really, pollution is not an issue for any of us or we wouldn't have a 1200 ... well except for boltman. His 1200 acheives zero emissions (and actually runs).

Jaime, I'm interested to know how much performance you expect to gain by deleting 3-4 ounces of PCV and adding a couple of pounds of other gear. Give me a number, as in horsepower.



As I said before, I really doubt it will be measurable, neither in performance or efficiency but I'd like to hear your idea.

actually, how many new cars a running around with duffed out catalytic convertors because their cars run too rich? ULP is more noxious to the atmosphere (without a cat') than leaded fuel is. these things never get replaced because it's assumed they're working fine cause "it's a new car".

i would peg that a well tuned 1200 would produce the same pollution as, if not less than, most shopping trolleys out there. why? coz we give a sh1t, that's why.

and i'm not twisting your insight. just upset at the reasoning behind your decision to remove the pollution gear. a PCV valve removed won't make ANY difference to your power output - just your oil consumption and effectively engine life.

my advice is run a higher octane fuel, a bit more advance to compensate and a stronger spark and you will have both more power AND cleaner emissions after a proffesional tune.