Oil catch can question?

[NDFong]

Hey guys

I did some research and I didn’t see anyone with a check valve with their catch cans. Question do I need it?

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[360glitch]

Most would tell you that you don't even need a catch can. I've ran one myself and it did little to nothing. The money can likely be better spent elsewhere.

 

[NDFong]

Did you catch anything?

 

[SDAlexander8]

Catch can will catch a couple ounces every few thousand miles. I seem to get more gas in my catch can than oil, which may indicate that enough gas is getting through the pcv to keep the intake valves free of significant buildup.

I’ve also seen pictures that show the injectors are aimed at an angle where they spray gas on the edges of the intake valves as they go down into the cylinder. I think this was done in an effort to keep the edges of the valves clean enough to prevent valve float in the long term.

I use a mishimoto catch can and CRC turbo/intake valve cleaner every 10k miles just because it makes me feel better. Until I see somebody shove an oscilloscope down into the intake of an Si with 75k-100k miles on it with no preventative measures taken, i’m gonna keep running it. The catch can is catching some oil.

 

[saiko21]

Catch can will catch a couple ounces every few thousand miles. I seem to get more gas in my catch can than oil, which may indicate that enough gas is getting through the pcv to keep the intake valves free of significant buildup.

I’ve also seen pictures that show the injectors are aimed at an angle where they spray gas on the edges of the intake valves as they go down into the cylinder. I think this was done in an effort to keep the edges of the valves clean enough to prevent valve float in the long term.

I use a mishimoto catch can and CRC turbo/intake valve cleaner every 10k miles just because it makes me feel better. Until I see somebody shove an oscilloscope down into the intake of an Si with 75k-100k miles on it with no preventative measures taken, i’m gonna keep running it. The catch can is catching some oil.

CRC turbo/Intake cleaner is it any good or is it just snake oil ? I saw some STP stuff in Autozone yesterday when I was helping my friend to fix his car. I wanted to use that but I felt it was expensive at $40

 

[jayy_swish]

These engines run relatively clean, but I still run a catch can. I bought a mishimoto replica off eBay so I think it was money well spent. Literally same design minus the brand name. None the less running E85 blend I seem to catch a good amount of condensation now. Does the engine need it? Not really, but I rather catch some of the crap in my catch can than it being sent back into my engine to gunk my valves. To each their own

 

[jayy_swish]

You don’t really need a check valve since the PCV valve is already a one way valve. It only opens when there’s enough of a vacuum from the intake to begin pulling the blow by in the crank and the pcv system needs to operates on a vacuum so there’s really no chance of it reversing, as once the vacuum pressure is gone the pcv valve closes back up blocking anything from going back into the crank

 

[SDAlexander8]

CRC turbo/Intake cleaner is it any good or is it just snake oil ? I saw some STP stuff in Autozone yesterday when I was helping my friend to fix his car. I wanted to use that but I felt it was expensive at $40

A can of CRC is 12$ last time I bought a can. Just make sure you follow the instructions carefully. It’ll seem real sketchy the first time you use it. There is no noticeable difference if your car is low milage, just preventative. It’ll smell like rotten eggs coming out of your exhaust though. Idk if that means it’s working, or if that’s just what the stuff smells like when it burns and passes through the cat

 

[jayy_swish]

They’re work to an extent, but it’s not night and day where it completely flushes the system and leaves it spotless obviously. It just cleans spots here and there

 

[shibles]

In my mind, a couple bucks to keep the engine cleaner in the long run (even if it's not much) and keep the intake mixture consistent is worth it.

 

[NDFong]

Thanks for all the feedback guys. I only have 58 miles on the car. I just want to have a cleaner running engine. I’m going with a oil catch can without the upr check valve! Thanks again!

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