oil catch can [Merge]

[Rice Burner]

I just ordered my intake and K & N filter from Dejon and now I'm looking for a Catch Can. Does anyone know where I can get one of these? I have looked on some web sites with no luck, with the exception of (i think) Machv for $99.

Any help would be appreciated.

Also does anyone know if any one sells the rubber window trim that goes on the door for the window. You know the one at the top of the main part of the door on the outside. The black coating has pealed off and looks pretty bad.

Thanks in advance!

 

[KeltonDSMer]

I am not a regular poster, but I'd lke to share my opinion.

First, Oldman is awesome for taking the time to explain all this.

Here's how I think about it:
-The crankcase always needs to vent blow-by
-The PCV is the main exit for pressure at idle because it has a vacuum behind it
-The PCV is closed under boost becuse the boost pressure will always be greater than the blow-by pressure
-This means blow-by can only exit through the breather hole under boost
-The intake pipe has the most vacuum under boost (when there is the most blow-by that needs to be expelled)

There always should be a vacuum on the crankcase to expell blowby. The IM provides this at idle through the PCV and the breather provides this under boost through the intake pipe.

Either the IM is plugged and there is no PCV, or the breather needs to be routed back into the intake. Weather you have a catchcan or not will not change the fact that the motor always needs to expell blowby (especially on an old engine). The PCV does that at idle becuse of the vacuum in the IM and the breather does it under boost because of the vacuum in the intake pipe.

I highly disgourage crankcase ventilation without a vacuum behind it.

 

[daren_p]

I'm looking for an oil catch can, the problem with most of them such as the Greddy or Cusco is the size. I want something smaller, like 6" tall by 3" in diameter. Also want a drain, don't really care about the sight tube & don't want a filter on it (needs to be sealed design). JM Fab makes a nice one but like I said the problem with it is I dont want the breather. Can anyone give me some recommendations? I saw this one on Ebay and it looks to be what Im looking for, just not to sure about the knock off stuff. If anyone is using this what do you think?

http://cgi.ebay.com/ebaymotors/OIL-...ewItemQQcategoryZ46098QQitemZ8045774468QQrdZ1

 

[fourreGsixty3]

Looks to me to be a good deal. If it has everything that you want and a low @$$ price like that then I personally would go for it. The seller also has a lot of positive feedback, and seems to be reliable and trustworthy, and name brands just add on to the price. Some people will only buy name brand...then some like me will buy name brand for certain things and go no name for others, all depends on how important the part is. Sorry about getting off topic at the end

 

[DGajre777]

Not bad, that looks good.

 

[daren_p]

Maybe I should read my own post, the one I posted doesn't come with a drain by the looks of it Shouldn't be that hard to drill and tap some threads to install one. They try and throw you abit with the cheep price of $15 but then charge $25 for shipping in the US and $30 to CAN. Normally I wouldn't buy a knock off product but all the name brand ones I've seen are too large for what I want. My only concern with one of the knocks offs is if it will be sealed properly, I need one without any leaks.

 

[kwaliph]

Here is a pic of one I fabed up just to give you some idea on what a custom oilCC may look like. And you can't beat free .

You must be logged in to view this image or video.

That's about 1 hour of work. Man it pays to work at a muffler shop .
$.02

 

[madman]

I highly disgourage crankcase ventilation without a vacuum behind it.

Can you explain this?



As I read it, the PCV is too match the vacuum in the IM to help in venting. If you plug the IM and the turbo inlet, why would you need a vacuum if you are just venting into a catch can with a breather.

 

[KeltonDSMer]

I don't quite understand your last post, but I discourage not having a vaccum "pulling" pressure out of the crankcase.

It's sipmle; the blowby is removed from the crankcase easier when there is a vacuum pulling it out.

The PCV is useless under boost and the intake pipe has the most vacuum under boost.

The factory set-up was designed for a reason. The fact that there is no catch can off the breather is probably because of maintnence and maufactoring costs.

 

[madman]

The PCV is useless under boost and the intake pipe has the most vacuum under boost.

Did you read this?

http://www.autoshop101.com/forms/h63.pdf

It states that if the PCV valve cannot flow enough blowby during extreme load conditions, then the excess leaves out of the breather. It doesn't say that vacuum from the intake pipe pulls out blowby. Under high load / low vacuum the PCV vlave is open at it's greatest to allow the most blowby out into the IM. If there is low vacuum then isn't the blowby being pushed out by crankcase pressure more so than being pulled out by low vacuum?

Yes there is vacuum pressure inside the IM, that is why there is a PCV vlave, to help regulate the amount of blowby that is allowed during different loads / different vacuum pressure. If there wasn't a PCV valve then at idle, I would think that the vacuum pressure in the IM might pull oil through the line rather than just gasses.

This is all in efforts to get blowby into the IM to burn off, again, becuase it has to go somewhere and the manufactures are not leagaly allowed to expell it into the atmosphere.

If you have a catch can then why do you need to route blowby back into the IM? I don't think you do.

 

[daren_p]

Well I didn't end up going with an ebay knock off, just couldn't bring myself to do it . I ended up going with JM Fab, they will make their catch cans without a filter if thats what you want. Thanks for the input

 

[ZiggysDSM]

Well I didn't end up going with an ebay knock off, just couldn't bring myself to do it . I ended up going with JM Fab, they will make their catch cans without a filter if thats what you want. Thanks for the input

all catch cans are basically the sam 2 outlets ant a some have a sight glass so i personally think the ebay one is better for the money i bought it and it works great

 

[mavisky]

Well I didn't end up going with an ebay knock off, just couldn't bring myself to do it . I ended up going with JM Fab, they will make their catch cans without a filter if thats what you want. Thanks for the input

You'll love Jim's attention to detail. I was going to tell you that you could just cap it off or tell him you don't want a breather on yours. He makes them all by hand so it's not too hard to leave the filter off of one.

 

[daren_p]

all catch cans are basically the sam 2 outlets ant a some have a sight glass so i personally think the ebay one is better for the money i bought it and it works great

Ya the catch cans are pretty basic & hard to screw up . My only concern was if I got one that didn't seal properly. Most of the Ebay ones are $40 or so when you add in the crazy price they charge for shipping, so for abit more I'm gettin a unit that is exactly what I want & I already know the quality

 

[olmytsi]

I have the JMFAB catch can and i love it. Bling Bling!

 

[antlip]

i have been looking into oil catch cans. i wanted to know what is the best way too hook one up? should i put the pcv valve into it also? if so do i leave the pcv valve in and go from there or use a brass barb? then block off the intake manifold hole. i know you put the nipple on the side of the vavle cover into there. so what is the way people do it and does this affect, tune, boost, anything at all?

i just ordered a oil catch can with breather filter on top, with a brass drain on bottom and two inlets.

 

[No_Skillz]

If you are running stock MAF, cap the filter and connect to the intake. Otherwise it will affect your tune.

 

[SpoolinTalon2]

ill take a pic of my home made one and put it up in this thread.

 

[DGajre777]

http://www.roadraceengineering.com/instructions/catchcaninstructions.htm

Courtesy of RRE.

 

[antlip]

great site, thanks. so if i understand this correctly, your suppose to leave the pcv valve in, run the hose from that and cap off the intake manifold hole. is this the better way to go with the catchcan? also how much of a difference will this make in my tune? i just had it tuned last thursday, i may have to learn dsm link and touch it up now.



also my car was tuned with just a breather filter on the side of the vavle cover, and the pvc valve still hook up properly

 

[turbo8765]

I wouldn't run the PCV to the catchcan unless you gut it.

I swapped the fitting on the intake mani and the PCV. Then run both valve cover fittings to the catchcan and cap off the PCV now attached to the intake manifold. This gives the best pressure relief under boost when you need it most.

 

[antlip]

I wouldn't run the PCV to the catchcan unless you gut it.

I swapped the fitting on the intake mani and the PCV. Then run both valve cover fittings to the catchcan and cap off the PCV now attached to the intake manifold. This gives the best pressure relief under boost when you need it most.

im not understanding what your doing. you took the pvc valve out and ran both nipples to the catch can. now the confusing part

" cap off the PCV now attached to the intake manifold"

are you installing the pcv vavle on the intake manifold?

 

[oldman]

I swapped the fitting on the intake mani and the PCV. Then run both valve cover fittings to the catchcan and cap off the PCV now attached to the intake manifold. This gives the best pressure relief under boost when you need it most.

The stock route gives the best pressure relief on or off boost, catch can simply gives you a clean intake tract but everything comes with a price.

 

[antlip]

so should i leave the pcv vavle alone then? is that little bit going into the intake manifold not hurting anything?

 

[No_Skillz]

It's a dilemma... if you want to hook up the catchcan to your PCV, you need the breather on the catchcan. However, if you're running stock maf then your catchcan should also be routed to your intake, which does not like the breather on it. I would just leave the PCV alone until (if) you upgrade to a gm maf or something.

 

[kmoore]

I'm not trying to steal this thread or anything but where is the PCV Valve? Is it on the Intake Manifold or is it on the back of valve cover? Also, this might seem stupid but what does PCV stand for?