would it be a dumb idea to recycle it :O? haha

 

If you actually accumulate enough to add it to your oil you drained from the engine, then sure recycle it.....

 

thanks for answering my questions Vlaze! +coolness for you

 

Since the whole point of oil catch can is to prevent oil getting into intake.
Why can't we just cap it?
Just wondering....

 

Equalize pressure.
If you ever cap it at the filler neck and start the car, run it for a bit then turn it off.
Then remove the oil fill cap, you'll hear the excessive pressure bleed out.

 

i love my weapon r just because of bling factor ___

 

Ah, thanks~
I just installed oil catcher recently(with breather, not routing back to intake).

Another question is, in the DIY it mention about try to keep the filler cap higher than the entry port to the catch can so the overflow will run into the can with gravity.
And my entry port of the catch can is actually higher, would it matter?

Thanks in advance.

 

Debatable...
Some will tell you that the catch can needs to be lower so the excessive oil will flow into the can.
My thought... who cares?
If the can is higher than the filler neck, the vapor gas will end up in the can, while the heavier fluid will likely just flow back into the oil pan.
Personally... I wouldn't worry about it too much.

 

Engine needs to breathe

 

Yesterday again, I notice oil in my intake. I am thinking of making a temp catch can until my real one comes in (couple of days). I am going to plug the intake, and re-direct the tube from the oil-filler neck and have it drain into a container without a breather filter. Can I do without a breather filter for a couple of days? Does it just vent gases and over-flow oil, or does it also suck in air as well?


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Yeah, you can do without the breather.
What ever you decide to run the tube into, just make sure it's not perfectly sealed and you'll be fine.
Just make sure the hose can't come out.
Maybe just make a second hole in the top for venting?????


You sure you aren't overfilling?

 

Not overfilling. I checked the oil level and it is a little below the full mark on the dip stick. Seems like blow back. Had to clean out the oil through out the whole intake, throttle body, and part of the opening of the upper intake manifold (couldn't get all the way in there without taking the whole thing apart).

Update:

Here is my temp catch can. It's a minute maid plastic bottle There is enough space around the tube and it isn't sealed. Seems to be ok and is wedged in tightly between the window fluid container and the metal brace. I've driven around a bit, and so far no oil. I sure hope the oil isn't coming from the other two tubes on the intake.

 

^^ it'll take some time and long drives for better results

 

My Raceroots catch can came in and I installed it. Is a breather filter really necessary seeing as the oil filler neck tube it's just exhausting oil vapors? Or does it suck in air as well? I was thinking of just leaving it open without a filter if it only exhausts vapors.


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Would be fine.
I only put one on as I found one that was a fairly decent color match.

https://www.rx8club.com/attachment.p...7&d=1231622849

 

Decided to put on a K&N to filter out any dust from entering the can. Plus it looks cool

Here's my completed catch can setup:

 

^Looks clean. Nice job

 

New to the forum and new rotary owner. Been thinking about doing this mod. I was looking at your setup and was just curious about one thing. I thought the catch can was supposed to be mounted lower than the hole from the oil fill tube. From the looks of it, and it might just be the picture, but it looks like the catch can is higher.

 

My can is slightly higher, but I think that's a good thing. Any small amount of oil that enters the tube will drain back into the oil-filler neck. It will require a substantial amount of blow-back oil to get into the can.

Having the can lower does nothing but drain more oil into the can, as any oil entering the tube (even a small amount) will be drained into the can.

 

nice, but it must be remove on every oil change to take the oil filter off correct?

 

No. My catch can is by the brake master cylinder. The oil filter is behind the upper intake manifold. You can easily remove the oil filter without touching the catch can.


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I see what you mean. Makes sense. So in theory I could just have a tube with an upward facing L and a breather on the end. Since the point is to have it drain back down. No can required?

 

Yes in theory. I was thinking about doing that a while back. Problem is, if it's not high enough it may not be able to stop a large blow-back, leaving your breather filter dripping with oil. With a catch can, you avoid all of that.

.

 

Um,

About exposing the catch can inlet to atmosphere through a breather. I did it just that way. Turns out it is a bad idea, at least when you run all 3 to a catch can. I just finished a few session of MM tuning. The first thing he said was I have bad news, there is a huge vacuum leak. All the fuel trims are adjusting for it.

While it is true that those lines do not see vacuum, they do flow a lot of air. That air ends up in the combustion chamber. If you vent to atmosphere, that combustion chamber air never flows across the MAF, and the car runs lean until it gets sorted out. That may be why cars idle like crap after the battery dies. Mine used to, does not now. Much less to re-learn.

I could not hear the leak with the can installed, but once I disconnected the line, I could hear it. I routed the line back to the intake and the car immediately started to run different, then started to smell rich, then settled out a few minutes later.

So, if you have only the oil fill routed, you are probably good. If you did the others, to prevent a bad check valve from filling the intake with oil, you better run the air source back to down stream of the MAF.

 

Think you hit the nail on the head, you ran all lines to the can and not just the one.