What exactly is the metal tube coming out of the shroud on top of the engine. I assume it isn't a pvc since it blows air out instead of sucking it in. what is the purpose of it attaching to the air filter.

Joseph Bates
1963 700
Corryton, TN

The tube makes a Positive connection to the air cleaner housing.
The air blowing out is pressure from the Crank case.
This is a Venting system.

Positive
Crank case
Venting

Or PCV PVC is a plastic used for making pipe and stuff.

Junky
Hurricane Utah.
Home of the "Red Desert Corvair Sanctuary."



62 wagon under construction.(Taking all my time and $$)
61 lakewood parts car.
half a dozen parts cars n trucks
20x40 garage full of greasy parts



Edited 1 time(s). Last edit at 02/21/2012 02:16PM by 62corvairjunky.

So if I change breathers, do I need to somehow attach it to the one or can I reroute it somewhere else without issues

Joseph Bates
1963 700
Corryton, TN

I recommend running it to your new filter system.

Junky
Hurricane Utah.
Home of the "Red Desert Corvair Sanctuary."



62 wagon under construction.(Taking all my time and $$)
61 lakewood parts car.
half a dozen parts cars n trucks
20x40 garage full of greasy parts

Ok. what is the reason for it to recycle back through of it is releasing pressure, I'm just curious

Joseph Bates
1963 700
Corryton, TN

Back before PCV, about 1959, the crankcase had a tube that usually came out the top back of the block, this tube curved down and vented to the atmosphere and dripped oil to mark the spot it was parked at. Along comes the desire to eliminate the oil droppings and associated smell. so they moved the vent into the air filter. This gummed up the carburetor. So an additional line with a small restriction hole was run into the intake, this sucked the crankcase vapor into the engine past the carb. This is how most EM's and some LM are set up. It was found that this setup was not adequate at higher power settings so the small bleed hole was replaced with a PCV Valve that opened more when needed. Most new PCV systems pull air from the filter, through the block, then through the PCV Valve and into the intake.

Back in the good old days before PCV when the engine got some wear on it the crankcase vent would puke oil and a smell just like the Corvair heater with leaky push rod tubes. Just you would smell it outside the car.

Nothing like that smell and leaded exhaust had a smell all its own. Remember it well. Maybe that is the reason I am the way I am???



Edited 1 time(s). Last edit at 02/21/2012 03:56PM by Mountain Pilot.

Several reasons.

Combustion pressure is sealed from the crank case by the piston rings. This seal is not perfect so crank case pressure would build up unless it is vented. Also these "gases" react with oil causing sludge and such.
The better the gasses are evacuated the longer you engine lasts.

On a corvair, if you just let it vent into the engine bay, the fan will suck the vapor from the vent and put it into your heater system and into the cabin.

using a positive venting system evacuates the gasses more thoroughly for engine life.
It keeps the emissions down by burning the gasses in the combustion chamber.
It keeps the heater from polluting the cabin.

Junky
Hurricane Utah.
Home of the "Red Desert Corvair Sanctuary."



62 wagon under construction.(Taking all my time and $$)
61 lakewood parts car.
half a dozen parts cars n trucks
20x40 garage full of greasy parts

whatever this system is called I NEED ONE!!!! I need the metal tube and any related parts. I can replace the hoses if necessary. I need the system that fits a two air cleaner set-up not the one that goes to a central air cleaner (64 and later?)

The crankcase produces blow-by gases; low at idle, high during high engine loading.

At low rpm, engine vacuum is high and gases are sucked directly into the intake manifold through the PCV valve. During periods of high load, engine vacuum is low so gases flow past the PCV tee and directly TO the air cleaner.

During periods of low blow-by, the PCV valve sucks more air than what's coming from the crankcase and the extra air comes FROM the air cleaner. That's why it's important to provide clean, filtered air for the PCV.

Why are blow-by gases controlled? 1) Blow-by gases smell bad (and in the case of a Corvair vented above the shroud enter directly into the heater system). 2) 50% of the engine's unburned hydrocarbons come from crankcase blow-by. 3) Ventilating the crankcase with clean air removes moisture that produces sludge and acid. 4) The system places a slight vacuum on the crankcase, which aids in reducing oil leaks.

Craig N. Coeur d'Alene ID.
66 Black Monza 4-dr, 4.2L V8 49k
66 Monza 140/4 EFI 60k
65 4-dr 110/AC/PG (project)
61 Rampside
62 Rampside (almost done!)
64 GB -CrUnChEd (donor)

20 Tons of parts in boxes

Cool. you learn something everyday. I have an idea of how I'm goin to route it back the cleaners.

Joseph Bates
1963 700
Corryton, TN

I have no photos but I have used the flexy stainless steel gas line that is used to hookup gas appliances, to connect things like this, just cut off the pipe fittings on each end. They are available in all kinds of lengths and look good.

I'm thinking something along those lines, maybe a slightly longer piece of tubing like the original that I can tuck behind the system

Joseph Bates
1963 700
Corryton, TN

this past weekend i finally connected a hose from my crank case vent to the air cleaner (61 lakewood -- no pcv). before a hose was present, oil would be present surrounding the vent after driving -- obviously it was coming out of the vent.

after adding the hose and driving around the block, oil had leaked out of the oil filler tube.

sign of bad rings? or can i just try for a tighter seal on the filler cap?

------------------------------------------------
san jose, ca
61 lakewood 4-spd
64 spyder

SB.... please attach a pic of your engine.... please!!


A '61 would have a road draft tube...

IF you have a 1/2" tube on top of the fan shroud... you need a PCV system... or switch to a road draft tube.

And yes.. sounds like worn rings.. or the oil is too thin...

---

MODERATOR
Somewhere between Sea Mountain and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
............v8........................................PG...................................Turbo

i'll take a photo later when i'm at home.

------------------------------------------------
san jose, ca
61 lakewood 4-spd
64 spyder

Just to be plain & clear, is the oil coming out the Oil Killer or the Dipstick Tube.

If it is from the Oil Filler tube, then the gasket is shot or the brass spring ring has lost its "push". Fix the cap and see what happens. If the cap is off even on a great running engine, it will spray oil all over.

in this car (lakewood), the filler tube IS the dipstick tube.

maybe i should switch to a road draft tube (out of the shroud?) and ignore the nipple on the air cleaner?

------------------------------------------------
san jose, ca
61 lakewood 4-spd
64 spyder

Showes you that I have never owned a Lakewood or Greenbrier... Learn something new every day...

Yup.. Wagons use the same pieces as FC engine.


SB... you are missing another hose / pipe with a Tee...


I'll let the Wagon owners get you straightened out..

---

MODERATOR
Somewhere between Sea Mountain and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
............v8........................................PG...................................Turbo

you mean for a PCV? not on a 61 non-california lakewood, i don't think. but please, i'm all ears!

------------------------------------------------
san jose, ca
61 lakewood 4-spd
64 spyder