crankcase press

[Ranchero50]

Yeah, but as so many folks on here asking questions realize, what it's supposed to be and what it is have a tendancy to not be quite the same. It's a simple test.

Also note that if you are running a better sealing ring package like the Total Seal gapless rings they recommend a restrictor plug in the pvc port with a 1/16 or so hole in it. That is supposed to reduce the amount of air flowing through the motor because the blowby is so much less.

Jamie

[Tweetie69]

Ye old road draft tubes ouch. The early small block V-8s had them as did the 144, and 170 I6. I had a 63 Falcon 170 I-6 that had pcv but a friend with a 62 Falcon and 144 did not. By 65 my friends with Mustangs had PCV but my factory racer 67 390 fastback had two breathers from the factory and a friend that had a Factory 68 Torino racer with 428 also had 2 breathers.

Two breathers were a mess as all engines breath a little oil out so it was all over the valve covers and was part of the daily clean wax tune that kept the factory racers as super sleepers on the street.

This is a rough sketch of the little breather system I saw on horsepower TV today on my engine. Yeah, it is a pretty fantasic depiction of my motor, i know. Anyway, I thought it was a pretty cool idea that I'm planning to use on mine in place of the PCV system. The hoses run into a reservior to catch all that messy oil film while still allowing pressure to escape out the top through a regular breather filter.

[fordman]

for that to work on our engines it needs to have a in and an out. you cant have two outs. so it will have to be routed different with those hoses. one hose has to go in and the other has to out to catch the oil that may build up in the bottom of that bottle.

[Tweetie69]

I think the idea is to hope you're not pumping staight oil out the vavle cover so the canister only catches that small amount of oil film that would otherwise end up on the valve covers and down the side of the block. The "out" is the filter on top of the bottle. I'm pretty sure if it's so bad that you'd need an oil return line out of the bottle, you may have other problems. Either that or mine is out of oil or gave up on pumping it to the top of the motor.

[Ranchero50]

When I got my '93 stang the PO didn't understand that 6psi of boost requires 93 octane on a stock motor. RIng lands were missing from two cylinders. Did that basic setup, catching a quart of oil every 60 miles... Get to work, lift the container and drain the oil back in, get home, repeat. Forget and the oil would streak between the hood and fender...

Jamie

[cdeal28078]

It seems like too me that once the hoses and bottle all equalize to the same pressure then nothing would go anywhere.
That is just the way I see it not saying it won't work.
I am having a little trouble with the oil film on the 460 in my 71 F100 so I am interested. I just think I don't have the right PCV valve OR my filtered inlet cap is saturated and or not sealing like it should. I can let it idle hot and get absolutely no smoke or mist out of the left hand valve cover.
On a rebuilt or engine in good shape I just don't see why you wouldn't want to run a normal PCV system. Now I understand if you engine is getting tons of blow by and you are just trying to get a few more miles out of it then that set up might just work,.
clint

[Dragon]

My engines (several FEs) Seem to always breath more than the PCV system takes in. I have a new rubber donut at the PCV valve and still it seeps a little with no filter at the other end. The hose goes no where and slowly adds a film under the hood as it breathes out. Not a pulse like something is wrong I just feel my valve guides are a little worn.

I was looking at a catch can on Summit and then I was going to put a hose off the top with a breather about 12 inches above it. So the oil vapor would come off the Driver's side oil filler and run down to the catch can which I will mount it low and by the radiator. So the oil vapor has time to cool off dropping to the can then to it's bottom and any stuff still warm enough to try and go out will have to cool down more on the way up to the breather. Also it will help me tell if gas is present in the oil because only gasoline fumes should be able to travel that path. Every so often set it over the oil fill hole and open the drain.

[fordman]

that bottle is the out yes. but where is the in for the air to help evacuate the crankcase? you have to have two seperate lines. not one merged together.

[Tweetie69]

Fordman, I think one of us is confused. I'm assuming that because you are 100% FORDified and have almost 22000 posts, you might have a little more experience than I do in FE's, so more than likely I'm the one that's confused. Would the gap in the rings that allows pressure to sneak by into the crankcase not be the in you're talking about. I don't know. This is about how it was set up on my magic picture box, but then again, you can't believe everything you see on TV. If I'm wrong in my thinking, PLEASE, tell me. I joined this sight to learn, and try to spead the little knowledge I have.

[Dragon]

The TV is not wrong on this case the engine must have air coming in at some time. The engine breaths out as it warms up and breaths i when it cools down. A normal engine always breaths in and out as it runs for the PCV to work. A lot of engines breath out when running due to ring blowby and valve guides leaking, Mostly exhaust. Because those hoses do not contain PCV valves or a check valve anywhere the engine will breath in and out. If there was one PCV inline in the hose after the Tee or at the tank then the engine could only breath out.

You don't have to have a PCV valve. It performs 2 functions when hooked to the manifold. It allows the engine to suck the oil fumes out and burn them. It stops a backfire from blowing into the engine and destroying every gasket and seal. So if it is not hooked to the engine and not hooked to positive pressure then it does not need a PCV valve. Boy is PCV(Positive Crankcase Ventilation ) hard for me to get out. I work with PVC (Poly Vinyl Chloride) pipe for wiring. Just today I typed PCV instead of PVC in the accounting system because I have been reversing my letters for this conversation.

[fordman]

if the rings are bad compression air and gases can get into the crank case. the pcv system on our trucks is a cycling system. it is kind of a non ending loop. in our trucks the air gets brought into the enigne via a valve cover breather. on the other valve cover is the pcv. is is hooked to manifold vacuum. the manifold vacuum sucks the air out through the pcv. the fresh air for the pcv is sucked into the crankcase by the other valve cover breather. so if you were to run both valve covers to one hose and then into a jar can or bottle you would have a road draft type of set up kind of. which the road draft set ups were even more dirty than a pcv setuyp. and the pressure would not be sucked out it would be pushed out of both valve covers. and anyplace else it wanted to push it out of. like the dip stick tube or a leaky oil pan gasket or a valve cover. one valve cover needs to be open to get air into the system so to make it cycle. up and outinto the jar. or a suction hooked into the jar to suck the pressure out. the crank case really needs this in and out type of system. i dont have tv anymore. could you point me to the show on the site you saw. which episode i mean. then i could check out wht they were trying to say.

[Dragon]

On a race motor you don't want a PCV valve, You don't want the crankcase fumes messing your jetting and vacuum up.