[buckwam]

I installed a mishimoto catch can set this summer and had very little to empty in the warmer months, but yesterday I checked and one was full. I guess the colder weather is to blame.

[bishopts]

Originally Posted by buckwam

I installed a mishimoto catch can set this summer and had very little to empty in the warmer months, but yesterday I checked and one was full. I guess the colder weather is to blame.

Thank you for the reminder

[Scargoes]

it must be the moisture in the air. The catch can on my LTG has filled twice with water with a couple drops of oil. My LT1 doesn't do this. I was freaking out. But it's plain water, not coolant or anything else.

[ctrlz]

Originally Posted by buckwam

I guess the colder weather is to blame.

Catch can is cold and condensing water vapor. Water is both in the air and a byproduct of combustion. There will be some blow-by in the crankcase.

[bishopts]

Looks like I've got a little moisture in mine.

[DeuceCam]

Yeah this can happen in cold weather. Short drives--when engine doesn't reach operating temp--and catch can location--if it's in a spot where it's not exposed to engine bay radiant heat--will exacerbate the issue. The catch can lines can also get clogged with congealed oil/water vapor.

This is why air/oil separators often have a coolant circuit, to keep the can warm.

[bishopts]

I'm running with my pcv blocked off and only ccv is open. So that's probably not helping.

[bishopts]

This pcv path bypasses all but mishimoto catch cans. So i just ran a old head bolt from a gm 2.4 into the port to block it off. Its been working fine and i noticed it doesn't smoke at idle anymore.