i was planning to do some mods to my 22re and was wondering whether i whould perform the pcv catch can mod or just disconnect the hoses, plug them, and place breathers on the valve cover. anybody got any input on which ones better and what are the benefits? THANKS!!

 

There is atleast one....probably more....thread on this that I can think of. As I recall, some using the breathers noticed quite a bit of combustion odor from within the cab. Very intolerable.Then, there is the enviromental impact issue, if that is a concern to you at all. Your choice on that.

Personally, I'd do the catch can. That way, both your concerns and the benefit of the world at large are addressed at the same time. (No moralism here. My EGR is bypassed at the moment for economic reasons. Need a new valve.)

However..... if you're getting excessive blow-by, that will have to be addressed sooner or later and neither mod will fix it. You may be able to keep out of the intake, but oil will still get into the combustion chambers eventually fouling your plugs and oxygen sensor/s. And, the by-products only make the condition of your rings worse. Viscious cycle.

 

see next post

 

the catch can will stop the oil blow by from the pcv valve and help with the oil consumption/burning a bunch. if you do the can put a new pcv in place when you add on the can. or you can just put the breather valve on.
the can, can do wonders on oil burning, made a BIG diff on my old GSR integra. i am running the small breather on the air inlet nozzle (the hose with out the pcv, the one from the air filter or hose) due to the weber carb.
so you could run both breather on inlet and can after the pcv valve.

 

I can see that. It's atleast not being recirculated through the intake and back into the cylinders, but it's still doesn't entirely keep it out. Afterall, that's where it's coming from.

I dealt with blow by for a while. Finally just put new rings in and had the head rebuilt. Should be a none issue, now....

 

I did this on my 99 32V Mustang Cobra. I just placed a breather there and it wasn't too bad. But whenever your PCV valve is hooked up to your intake like from the factory, any excess oil vapor gets into the air stream (obviously). The problem with this is that usually it is unmetered air as well as when it combines with fuel, it lowers the overall octane fairly significantly. PCV is a nasty little device if you ask me.

 

What does the catch can mod look like on a toyota?

 

thanks everyone! got a list on materials i should purchase to do this mod?

 

I'd say do a can, not a breather. Reason is, a breather isn't "positive" ventilation. Without the positive ventilation you can get a buildup of sludge inside your engine.

See here for more info:
http://www.yotarepair.com/Sludge_Zone.html

Here's the main point in the link:
Pic of my catch can, made with parts from Home Depot:

 

looks great! what will i need and where can i get it?

 

just route your PCV line into your intake somewhere, breather or no. as stated above its called POSITIVE crankcase ventilation for a reason. When you hit the throttle your intake will produce a vacuum which creates a low pressure area and causes any excess air in the crankcase to be drawn into the intake resulting in more effective ventilation.

 

really? makes sense but wouldnt the catch can remove harmful deposits?

 

Yes it would. But, I don't think he's saying not to do the catch can.....just that the breather is not a good idea.

 

oh yeah that makes even more sense! where can i purchase these materials?

 

I don't know.

Mt. Goat where'd you get your parts?

 

It's just an air line dryer for a compressor and assorted fittings screwed together to fit the huge PCV line on the 5VZFE (hose barb fittings on the ends. I can't remember what the 3VZE line looks like but I'm thinking it is smaller. In never hurts to take a small section of your hose with you when looking for hose barb fittings at the hardware store. Oh, also I removed the filter part of the dryer. It all came from Home Depot.

 

I should probably mention something that surprised the heck out of me. I have yet to "catch" anything in my catch can. Yep, not a drop of anything. I suspect its because this is a very low mileage engine (less than 30k miles). When I first posted about the lack of "stuff" in my can someone mentioned I needed to put something in the can to help "catch" the oil in the can, or help the vapor condense in the can. So, I rolled up some alumiunum window screen material and put it in the can, but so far its still clean as a whistle. I'm not complaining about it, at least I don't have to empty it. I've heard getting the truck at extreme angles during wheeling can fill a can up quickly, but sadly I haven't been wheeling since I added the can.

 

great for your engine!

 

what i would do if you want to avoid making a catch can is to rout it into the airbox before the filter. the filter can stop the crud from going into the intake again and it will still provide some vacuum though not as much as in the intake piping itself.

 

My 4runner blows a lot of oil thru the PCV and back into the combustion chamber. I'm wanting to do this mod and was wondering what you'd do with the oil that gets caught in the can? Put it back in the motor if it looks clean? I go thru about a quart of oil every 800 miles i think. It's costly and annoying having to constantly check my oil level and buy oil to refill my engine back to a full level.