Why you want an oil catch can

[gixxer]

so I was going to be testing some more additives but now that I’ve had my oil catch can in for over a year now and use top tier fuel along with the ocassional PEA cleaner. I also have the exit line of the catch can venting to the atmosphere.

I took some before pics to see how effective the next fuel system cleaner I used.

Cyclinder 1 and 2 respectively.

They look pretty good less some speckling build up in cylinder 2 in the middle to bottom left of the image.

I am assuming that I am no longer getting any trace of oil vapor into the engine. My intake looks a lot better as well.

My fuel mileage during the summer has been 13.71 L/100 km or 17.16 mpg and that includes pulling a small steel trailer with a motorcycle on it.

 

[huntergreen]

Nice pics. Thanks for posting.

 

[Wild one]

so I was going to be testing some more additives but now that I’ve had my oil catch can in for over a year now and use top tier fuel along with the ocassional PEA cleaner. I also have the exit line of the catch can venting to the atmosphere.

I took some before pics to see how effective the next fuel system cleaner I used.

Cyclinder 1 and 2 respectively.

They look pretty good less some speckling build up in cylinder 2 in the middle to bottom left of the image.

I am assuming that I am no longer getting any trace of oil vapor into the engine. My intake looks a lot better as well.

My fuel mileage during the summer has been 13.71 L/100 km or 17.16 mpg and that includes pulling a small steel trailer with a motorcycle on it.

View attachment 142168

View attachment 142169

How do you not have a massive vaccumn leak if you've vented the exit line to the atmosphere.The catch can should be a closed system,if it has an open line vented to atmosphere,it should be sucking in air unless you've got some sort of check valve to prevent the vacumn from pulling in atmospheric air

 

[Wild one]

You're pistons look a lot blacker then the tops of my pistons did. Post #4 are pic's of my piston tops,and my piston tops look a lot lighter then yours do.https://www.ramforum.com/threads/how-to-4th-gen-hemi-cam-installation.82531/

 

[muddy12]

To add to what wild one asked,
Does the hemi pcv valve function differently than the older style(ones that were in the valve covers)?

The older style used a combination of crank case pressure, spring tension, and engine vacuum to control the opening and closing. By venting, you have eliminated the engine vacuum from the equation.

Also, by venting, you have nothing “pulling” the vapors out. You are relying on crank pressure and thermal expansion to “push” the vapors out.


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[HammerHead]

To add to what wild one asked,
Does the hemi pcv valve function differently than the older style(ones that were in the valve covers)?

The older style used a combination of crank case pressure, spring tension, and engine vacuum to control the opening and closing. By venting, you have eliminated the engine vacuum from the equation.

Also, by venting, you have nothing “pulling” the vapors out. You are relying on crank pressure and thermal expansion to “push” the vapors out.


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Can you post pics of your setup? Please.

 

[Ramm5.7]

so I was going to be testing some more additives but now that I’ve had my oil catch can in for over a year now and use top tier fuel along with the ocassional PEA cleaner. I also have the exit line of the catch can venting to the atmosphere.

I took some before pics to see how effective the next fuel system cleaner I used.

Cyclinder 1 and 2 respectively.

They look pretty good less some speckling build up in cylinder 2 in the middle to bottom left of the image.

I am assuming that I am no longer getting any trace of oil vapor into the engine. My intake looks a lot better as well.

My fuel mileage during the summer has been 13.71 L/100 km or 17.16 mpg and that includes pulling a small steel trailer with a motorcycle on it.

View attachment 142168

View attachment 142169

So if your exit of the catch can is vented to outside air, where is the hose to throttlebody? Also vented/pulling in air?

 

[muddy12]

I have a traditionally plumbed catch can setup, but with a much larger than normal can. It’s an industrial dryer tank that I salvaged and repurposed.
The can I used:

It also has internal baffles.

It’s mounted to the passenger side of the core support and is currently plumbed with flexible hose. I’m planning to make some aluminum hard lines to give it a more professional look.

Sent from my iPhone using Tapatalk

 

[gixxer]

How do you not have a massive vaccumn leak if you've vented the exit line to the atmosphere.The catch can should be a closed system,if it has an open line vented to atmosphere,it should be sucking in air unless you've got some sort of check valve to prevent the vacumn from pulling in atmospheric air

The PCV acts as a check valve. I originally ran it from the can back to the intake manifold and tried this without issues. I’m relying on internal pressure to open it up.

I realize this isn’t as efficient without the vacuum but as long as I keep on my maintenance I don’t foresee any issues other than the oil needing to be changed more frequently which I monitor with oil analysis. I wouldn’t be doing this if I had forced induction.

 

[gixxer]

You're pistons look a lot blacker then the tops of my pistons did. Post #4 are pic's of my piston tops,and my piston tops look a lot lighter then yours do.https://www.ramforum.com/threads/how-to-4th-gen-hemi-cam-installation.82531/

The Borescope is pretty cheap and the light isn’t that bright. If you look at my one post testing fuel additives, it’s a lot cleaner but for these pics I was in a dark garage.

 

[gixxer]

So if your exit of the catch can is vented to outside air, where is the hose to throttlebody? Also vented/pulling in air?

The opening after the throttle body is capped off.

I have the 4.7 and not the hemi.

 

[Ramm5.7]

The opening after the throttle body is capped off.

I have the 4.7 and not the hemi.

Ahh, rodger that!

 

[gixxer]

Ahh, rodger that!

I’m open to hearing everyone’s thoughts as I don’t want to miss anything.

There was little info online as to setting this up. Mostly turbo guys which is not our application.

 

[Wild one]

I’m open to hearing everyone’s thoughts as I don’t want to miss anything.

There was little info online as to setting this up. Mostly turbo guys which is not our application.

Turbo set-ups are a little different. On your set-up as stated,you're relying on crankcase pressure to push the vapors out,which is not an ideal set-up.You want a little vacumn in the crankcase to help seal the rings,and pull the vapors out.I ran a catch can on my old 4.7,and it was plumbed in with a line from the pcv to the can,then from the can to the intake.The PCV is gonna to trap the vapors in the crankcase,until there is enough pressure to overcome the pcv's valve,which is not an ideal set-up.If you're going to do it that way,you'd want to remove the pcv entirely and stick a breather tube with a filter on the end of the breather tube,or else plumb your open vent line into the exhaust system after the muffler,and use the exhaust to create vacumn in the crankcase,aka a crankcase/pan evac system similar to a drag cars set-up.