Catch Cans

[Dapepper9]

Lol. Yes

lol cool we’re on the same page now.
I haven’t used the separator personally to tell you that it solves the problem on track 100% but there’s no doubt it would certainly help minimize it

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[PoCoBob]

I've only ever built my own catch can systems from cheap ebay/Amazon baffled cans. The one I currently have has ss wool as the baffle media and works very well. So well in fact that over the winter on e85 I neglected to check it as often as I should have and it nearly completely filled with water after only a couple months. I used -10an fuel hose to route the lines to a mounting point away from engine heat as the catch cans purpose is to condense blow by gases and oil Vapor so keeping the can and baffling as cool as possible is key.

I'm curious about the moisture staying in the can. What type of driving were you doing during those months, did you let the engine completely warm up?

I have no interest in putting a can on my Mustang but I just put one on my 2016 Edge, it only has direct injection and I'm trying to avoid carbon build on the valves. I would have guessed that during an extended drive any moisture from the crankcase would separate from the oil inside the can and vent out the pcv system. Does anyone know if this does happen?

 

[Gfswindle]

I'm curious about the moisture staying in the can. What type of driving were you doing during those months, did you let the engine completely warm up?

I have no interest in putting a can on my Mustang but I just put one on my 2016 Edge, it only has direct injection and I'm trying to avoid carbon build on the valves. I would have guessed that during an extended drive any moisture from the crankcase would separate from the oil inside the can and vent out the pcv system. Does anyone know if this does happen?

The moisture staying in the can is the intended purpose. It caught oil Vapor as well but since the can was far away from heat sources, excess water vapor from e85 was also condensed and not allowed to enter the manifold. It filled up with about 6oz of water in about 2 months and maybe 750 miles. My drive is very short however to and from work at only 6 miles one way.

 

[PoCoBob]

The moisture staying in the can is the intended purpose. It caught oil Vapor as well but since the can was far away from heat sources, excess water vapor from e85 was also condensed and not allowed to enter the manifold. It filled up with about 6oz of water in about 2 months and maybe 750 miles. My drive is very short however to and from work at only 6 miles one way.

Thanks for the reply. We don't have E85 where I live so I know nothing about it or how much water is in it. But I would think the short commute to your work would add to how much water the can collected.

I saw something somewhere (?) that an engine takes much longer to warm up then the coolant takes. So even if the temp gauge says it's warmed up the metal parts still may not be up to temperature. And it takes about 1 hour of driving after everything has completely warmed up for all the moisture to evaporate out of the engine. It suggested a long drive about once a month would be a good idea.

 

[Gfswindle]

I only think the e85 contributes to the water vapor. I sure seemed to have alot more exhaust steam on cold mornings with e85 vs gas. Either way, the caught water vapor from the crankcase tells me the oil is getting hot enough to drive off moisture.

 

[CrazyHippie]

The reason the drivers side can never catches any oil is because that side is to allow air into the block in the event of a vacuum build up. So the airflow is going the other way. If you look the other end the hose attaches to the air intake tube between the air filter and the throttle body. So it's allowing filtered air into the block. Only the passenger side is made to allow air pressure to escape out

The reason the drivers side can never catches any oil is because that side is to allow air into the block in the event of a vacuum build up. So the airflow is going the other way. If you look the other end the hose attaches to the air intake tube between the air filter and the throttle body. So it's allowing filtered air into the block. Only the passenger side is made to allow air pressure to escape out of the block.

I thought that that the intake pulls air through the driver side PCV under a vacuum and that the catch can hose has a check valve in it to prevent reverse flow. The position of the hose connection on the engine side of the air filter is to keep crankcase oil from fouling the filter. Because of the intake vacuum, air is always pulled into the crankcase from the driver side PCV except when the crankcase pressure is pretty extreme, for example when pushing the car very hard at the track. Am I misunderstanding the way this works?

 

[PoCoBob]

I thought that that the intake pulls air through the driver side PCV under a vacuum and that the catch can hose has a check valve in it to prevent reverse flow. The position of the hose connection on the engine side of the air filter is to keep crankcase oil from fouling the filter. Because of the intake vacuum, air is always pulled into the crankcase from the driver side PCV except when the crankcase pressure is pretty extreme, for example when pushing the car very hard at the track. Am I misunderstanding the way this works?

This guy explains it the same way as I understand them to work.

 

[CrazyHippie]

This guy explains it the same way as I understand them to work.

Ok, I see! I was missing the fact that when the passenger side PCV opens due to crankcase pressure, relief air that's pulled in through the driver side PCV is not passive - it's filtered. I Thanks for helping me better understand!

 

[PoCoBob]

Ok, I see! I was missing the fact that when the passenger side PCV opens due to crankcase pressure, relief air that's pulled in through the driver side PCV is not passive - it's filtered. I Thanks for helping me better understand!

I think what confuses people is there should never be a vacuum inside the intake tube between the air filter and the throttle body. If there is a vacuum it means the air filter is plugged or simply not big enough to handle the air flow.

 

[80FoxCoupe]

I think what confuses people is there should never be a vacuum inside the intake tube between the air filter and the throttle body. If there is a vacuum it means the air filter is plugged or simply not big enough to handle the air flow.

You need to do some more research Bob.

 

[PoCoBob]

You need to do some more research Bob.

Research into what? Air flowing through a tube is not vacuum.

 

[Gfswindle]

There will be a small very slight vacuum from the venturi effect at WOT on the clean air pcv port and slight restrictions from filter, intake elbow ect, but on an n/a application, no real vacuum between tb and filter.

 

[80FoxCoupe]

Research into what? Air flowing through a tube is not vacuum.

You continue to prove my point.

 

[SheepDog]

You continue to prove my point.

Lol, I just can't anymore...

 

[GregO]

Time to post up “PCV 101” again ?

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