454 oil consumption (Cherry truck LOOK)

[Jason4x4]

http://www.aa1car.com/library/pcv.htm

open or closed is strictly a emissions deal.


The Positive Crankcase Ventilation (PCV) system reduces blowby emissions from the engine. About 20% of the total hydrocarbon (HC) emissions produced by a vehicle are blowby emissions from gases that get past the piston rings and enter the crankcase. The higher the mileage on the engine and the greater the wear on the piston rings and cylinders, the greater the blowby into the crankcase.
Before PCV was invented, blowby vapors were simply vented to the atmosphere through a "road draft tube" that ran from a vent hole in a valve cover or valley cover down toward the ground.
In 1961, the first PCV systems appeared on [COLOR=blue ! important][COLOR=blue ! important]California [COLOR=blue ! important]cars[/COLOR][/COLOR][/COLOR]. The PCV system used intake vacuum to siphon blowby vapors back into the [COLOR=blue ! important][COLOR=blue ! important]intake [COLOR=blue ! important]manifold[/COLOR][/COLOR][/COLOR]. This allowed the HC to be re-burned and eliminated blowby vapors as a source of pollution.
The system proved to be so effective that "open" PCV systems were added to most cars nationwide in 1963. An open PCV system draws air in through a mesh filter inside the oil [COLOR=blue ! important][COLOR=blue ! important]filler [COLOR=blue ! important]cap[/COLOR][/COLOR][/COLOR] or a breather on a valve cover. The flow of fresh air through the crankcase helped pull moisture out of the oil to extended oil life and reduce sludge. The only drawback to these early open PCV systems was that blowby vapors could still backup at high engine speed and loads, and escape into the atmosphere through the oil filler cap or valve cover breather.
In 1968, "closed" PCV systems were added to most cars. The breather inlet was relocated inside the air cleaner housing so if pressure backed up it would overflow into the air cleaner and be sucked down the carburetor. No vapors would escape into the atmosphere.

 

[4X4HIGH]

Yep, all of that is true except that the PCV system is there for far more reason than to just keep vapors from the atmosphere.

The road draft tube system only worked when the vehicle was moving at a decent speed to draw air past the tube and create a vacuum which sucked the vapors out of the crankcase and into the atmosphere. This system wasn't very effective and that's why the maker went with an "open PVC system" which once again wasn't effective enough which brought the advent of the "closed PVC system" that is on almost every car and truck and piece of equipment today.

 

[trevmountain]

I'll get the pcv system dialed today run it for a bit and then proceed as needed. I'll give Wally's a call over in IF to see if they've got a leak down tester and knowledge of using it if truck continues to use oil. Thanks for the tip Eric.

Thanks again

 

[Jason4x4]

http://www.aa1car.com/library/pcv.htm

open or closed is strictly a emissions deal.



In 1968, "closed" PCV systems were added to most cars. The breather inlet was relocated inside the air cleaner housing so if pressure backed up it would overflow into the air cleaner and be sucked down the carburetor. No vapors would escape into the atmosphere.

if it doesn't have the tube to the air cleaner, it is only an emissions problem.

 

[trevmountain]

Got the parts ordered today. It'll consist of a oil cap that nearly looks the same as the K&N breather but will be sealed up except for a little nozzle to tap a hose to it. Should be fairly easy and will only cost about 15-20 bucks. Regardless of the debate I'll hook it up this way and run with it.

Here's another pic for entertainment purposes. Gave her a bath.

 

[4X4HIGH]

if it doesn't have the tube to the air cleaner, it is only an emissions problem.

I'll let you believe what you want although i know otherwise.

Why do you think EVERY car manufacturer changed to a closed system?

 

[yellowK20]

No offense to 4x4high you do seem to be very knowledgeable.

But too the rest of you guys: Could you kiss his ass anymore??? I mean really he's not the only good mechanic in the world , and for you guys to treat a new member like that is pretty messed up . just because someones been on the site longer does not mean they should get treated better or get away with things that a newer member cant.

We should treat each other with the same respect . newbie or old hat this isn't pirate4x4.com

 

[yellowK20]

Oh and to the O/P awesome truck good luck with your problem

 

[AJMBLAZER]

wannabe did a pretty good job of going around and crapping on 4x4HIGH's posts lately. Dunno what his issue was. I just hate these silly dramatic good bye posts.


trev, SHECKSY!

 

[4X4HIGH]

Just to clarify, i did not bring anything into this about how long either of us has been around here.

 

[82355]

You CANNOT have any type of open air breather on either valve cover.

Huh, why???

Martin

 

[yellowK20]

Just to clarify, i did not bring anything into this about how long either of us has been around here.

No not you man just making a general statement about attitudes around these parts

 

[4X4HIGH]

Huh, why???

Martin

Well, i guess you can if you like oil leaks.

Crankcase blowby if not vented properly (closed PCV system) will blow rear main seals, timing cover seals, valve cover gaskets, intake manifold end seals, and any other area that is sealing the crankcase. This becomes worse with an engine that is high mileage and has rings that don't seal as good anymore.

 

[Jason4x4]

I'll let you believe what you want although i know otherwise.

Why do you think EVERY car manufacturer changed to a closed system?

I guess I was wrong, all hail 4x4high!!

 

[throttleissues]

I'll let you believe what you want although i know otherwise.

Why do you think EVERY car manufacturer changed to a closed system?

Hmmm, let me think...FEDERAL EMMISSIONS STANDARDS. Yep, that was it.

I guess I was wrong, all hail 4x4high!!

Yep, open end of PCV system is just that, open, whether it's a breather filter or a hose to the air filter housing. It allows airflow in or out that end. I assure you it does not have vaccum applied to the end in the air filter housing.

 

[82355]

I guess I was wrong, all hail 4x4high!!

Ask him about tapered cam lobes . . . . .

M<artin

 

[lectric80]

Yep, open end of PCV system is just that, open, whether it's a breather filter or a hose to the air filter housing. It allows airflow in or out that end. I assure you it does not have vaccum applied to the end in the air filter housing.

I am wondering if you worded that right? You have to know that there is vacuum in the air filter housing. How else would air be pulled through the filter into the carb? So, a PCV system that has a hose connected to the air cleaner is in fact under vacuum.

 

[throttleissues]

I am wondering if you worded that right? You have to know that there is vacuum in the air filter housing. How else would air be pulled through the filter into the carb? So, a PCV system that has a hose connected to the air cleaner is in fact under vacuum.

You apparently don't understand how the PCV system or flow dynamics really work. Flow without restriction does not cause a vacuum, just as flow in hydraulics does not constitute pressure until there's a restriction. The stock arrangement even has the vent tube enter outside of the filter, preventing even the restriction of a dirty filter from affecting it. That vent is to let air into the crankcase as the PCV pulls vapors out, and it allows pressure out when the PCV isn't drawing vapors (as in WOT) or when it's overloaded by blowby. Having the hose in the air filter housing just means that the vapors pushed out go into the carb instead of out into the atmosphere, which is why I agreed with Jason that it is an emmissions issue.

 

[lectric80]

I see what you are saying, inside the filter since the filter acts as a restriction there is vacuum. However, where the vent enters there would be no vacuum or very little vacuum since it is outside the restriction.

 

[throttleissues]

Exactly! Keep in mind that a clean filter wil cause little, if any, restriction anyway. My smogger stuff has the hose to the filter housing, and my exempt stuff doesn't. That way the air filter lasts longer on the old ones by not getting oily.