Oil Catch Can

ha ha ha ha....
might be useful for checking vacuum after installing can but more practically make a brake line vacuum bleeder.

 

I'm confused .... I understand the need for cleaning the oil and contaminates ... but, Years ago they used a replacable "PCV" (positive crankcase ventilation) filter in line to pick up some/most of this crap. It was supposed to be changed at intervals. Now this is not used on the vehicles ???

 

I signed in to like this poast.

 

You are confused.
The thing that they used to change on your old car was a Positive Crankcase Ventilation Valve. It wasn't a filter. It was a check valve to stop the possibility of air/fuel being sucked into the crankcase. They changed it because it would plug up, stopping the crankcase vapors from being drawn into the intake system.

 

Yes you are correct - but the hose from the PCV Valve went to the carb air filter metal container - and the plastic hose connector had a fiberous filter within. During tune ups we'd check the PCV valve and change the hose connector/filter on the metal air filter container ....

Something like this ...

https://www.cjponyparts.com/ford-pcv-valve-screen-5-0l-1986-1995/p/HW1964/

 

I stand corrected. You are correct. It's been so many years since
I've seen one, I totally forgot about the filter in the air cleaner. Thanks for the refresh.

 

His logic sucks because we’re adding not subtracting.

 

No PRoblemo ... Also the PCV Valves themselves were designed vertically and mimic the oil catch cans in this thread and also allowed the fluid in the fumes in the valve to drip back into the valve covers.

 

That, I did not know.
As my daughter says, "every day is a school day".

 

LOL That's why I'm here too - to read and learn.

As I said earlier I don't understand why these current engines do not have a similar design (oil catch and drip back with a replaceable filter. )

 

Geez. Logic:
OEM = two legs
Two possible mods... add a leg or subtract a leg.

If you add a leg, the quality will not be OEM as it is aftermarket and inferior. It will add weight causing loss of efficiency, prematurely fail, but will be popular at the mall and with the ladies.

If you remove a leg, you increase efficiency by reducing mass but... you also reduce leg life by half as it has to work twice as hard to accomplish the same amount of work.

To conclude, the OEM engineers who designed it originally with two legs jnew exactly what they were doing.

 

I’ve always wondered about these. I know what they do, and I’ve even run them on a past car, but won’t do it again. I just don’t get why. We own trucks that go 1/2 a million miles without this. Wouldn’t you think Toyota would add one if it was necessary or important? Or do all the 500,000 mile trucks have one of these??

 

The oil no longer makes its way into the intake. Caught in the "Catch" can.

 

They do make an air/oil separator that allows the condensed blow-by to drain back into the crankcase..
https://www.lingenfelter.com/produc...V System Oil Catch Can | $199.95#.XlUi8G5FzIU

 

Does anyone read product information! This oil catch can is used by Lingenfelter to prevent oil from getting into the intake system because of Turbocharged or Supercharged engines that can create excessively high crankcase pressures and in the right conditions, can blow oil into the intake! How much boost are you running on your 3.5L engine to require this device?


Now if you think about this, this reason shows that combustion gases get passed the rings on the power stroke. So that means oil can and does get passed the rings on the intake stroke. Do you have a catch can for that oil too?

 

Maybe Toyota didn’t think it all the way through?






Lol jk

 

Or just burned in the cylinder instead and never making it to the cats with no extra parts.

 

And where do you think the exhaust goes? Oil does not burn like gasoline. Gasoline does not have zinc in it. The zinc additive in the oil that protects your valves coats your Cat plating making it ineffective.
This is why oil manufacturers have lower zinc content.
I see no reason to put one on a vehicle that does not have extensive crank case pressure but as your engine wears and crack case pressure goes up and more oil is getting burnt you can prevent cat damage. If you put one one when you buy the vehicle and monitor level rise over life of engine it will give you good indication on how much blowby you are getting. If you keep your vehicle's for 100,000 miles or less i don't think it is worth it.

 

I know exactly where the exhaust goes. The same thing creating the pressure in the crankcase (blowby) is what is going out the exhaust in the first place. Unless you think the tiny amount of oil vapor picked up by blowby in the crankcase is really going to hurt the cats.

 

Exactly how much oil are you burning between oil changes?