Catch can setup

[wowzers9930]

Okay so after discussing catch can setups with a new buddy of mine I've devised a plan but need info on one thing. My plan is to delete the PCV valve by blocking it and running the rocker breathers to the can which is the normal setup with a vented catch can (Live in PA no fucks given). Anyhow my buddy said since he has a rb26 he has a spare oil drain to the block that he used to vent his bottom end to the catch can as well. He said he noticed a huge relief on the engine when doing this, it revved more freely and sounded healthier. He mention on the rb25 to vent my bottom end there was a freeze plug I would be able to tap into? Would anyone else happen to know a trick or where this freeze plug he spoke of would be? The trick to it is, you cant have any oil flowing past this vent because it will blow oil into the catch can...

[jr_ss]

Why would you ever tap into a freeze plug?

Perhaps you should search a bit more, there's a pretty long thread about catch cans.

[wowzers9930]

Ive read them all, none cover the venting of the bottom end... Im not pulling vaccum from the turbo intake because I don't care to vent my can and blocking my PCV will get that nasty oil/gas out of my intake which I have heard of power gains from doing so.

[unwtdhero]

If you remove the amount of freezeplugs you have you raise your chances of cracking the block if the coolant (given was able to freeze) froze those plugs pop allowing the freezing water's pressure to escape. Also they are good for accessing the coolant ports. Past that i do not see any potential use. Again maybe you misunderstood your friend, search some more.

[wowzers9930]

I know most of the freeze plugs are for coolant, and that they shouldnt be tapped into... This is the message I got "I know theres one on the 26 block that goes right into the top of the sump. its actually on the side of the crank girdle.. perfect to pull out n tap a nippe to... maybe look up the factory service manual n see where each freeze plug goes. any one that goes into the sump is good. just make sure you get the right one. some freeze plugs go into oil passages and water passages."

[Kingtal0n]

venting the valvecover is the same as venting the "bottom end" the two are connected, collectivelly known as the "crank case" thus the meaning (and origin) of the word: Positive CRANKCASE ventillation- which takes place at the valvecover from the majority of factory engines for various reasons. Best not to [email protected]*#(& with those reasons and keep it simple.

[codyace]

I'd suggest stop listening to your friend before you end up with bigger issues.



With that said, what engine are you personally working with, an RB/KA/SR???

[wowzers9930]

Rb25 series 1

[Darius]

You cannot just connect the valve covers to a can and run the can to the crank case. It is not "venting" the pressure anywhere. If your friend did it properly, he ran the can drain back to the block to return the oil that is captured to the pan, but his catch can should have had a vent filter on it. If it did not, do not take advice from said friend again.

You have 3 options, vent the can to atmosphere, vent the can to the intake ahead of the turbo, or vent the can to the exhaust preferably downstream of the O2 sensors.

[wowzers9930]

yea, after talking with him I learned a bit more. I was over thinking the whole thing. A catch can setup is easy when you say fuck the environment and just vent to atmosphere. I plan on blocking off the PCV, and running the valve cover 2 lines to a vented catch can with the filter removed and just a line ran straight to the ground.

[Darius]

That's how I have mine :)

[mpapers22]

Also "freeze plugs" are not freeze plugs. They are core plugs and are only there to fill the holes left over from the blocks casting. Theyre not designed to push out in the case of the block freezing. Usually if it gets that cold and on the off chance they do pop out, the water jackets will be cracked as well.