[DIY] Oil catch tank

[D7zul]

Hi bro zul. Actually what I have discovered are differ from yours.
PCV valve will always open when there is vacuum from intake manifold, not open only if got high pressure.

I've confirm this, when I unplug PCV valve from cam cover (with vacuum hose attached and engine running) I can heard whistling sound came from PCV valve. Which mean PCV valve operate without any pressure.

Please correct if I'm wrong

I don't know exactly how it works. Mayb its a 1way valve

Anyhow, i think caarzee should check that valve 1st. Mayb its not working

 

[Caarzee]

hi D7zul,

Here's the layout and the sample image of the PCV. It has a valve but I don't know if it operates when there is high pressure inside the crankcase or whenever there's a vacuum pull from the intake manifold or both. Engine is Nissan QR20DE for 2.0cc or QR25DE for 2.5cc. Car models - XTrail and Sentra year 2004-2007.

Here are some self test, provided the valve is on the hose.
http://www.dummies.com/how-to/content/how-to-check-and-clean-the-pcv-valve.html
http://www.oreillyauto.com/site/app/newsfeed/detail?article=800567427

Thanks.

 

[Civic Type R]

DIYed mine yesterday.. But i buy the wrong filter,the Wira one.. Sighs.. Gotta get an Iswara one later.. :argh:

 

[D7zul]

DIYed mine yesterday.. But i buy the wrong filter,the Wira one.. Sighs.. Gotta get an Iswara one later.. :argh:

i think it's ok.. any model should work..

the difference is only the design.. nothing else

 

[Civic Type R]

i think it's ok.. any model should work..

the difference is only the design.. nothing else

Haha.. Thanks bro.. But the design is not the same as the Iswara's.. :hmmmm:

 

[alex_khoo]

i think this picture would be easier to understand bcoz my engine have a hydrogen generator

put the oil catch tank between the yellow lines..

bro dzul....im using svt too!! tat is isawara FUEL filter? and how many mm hose needed?tq

 

[D7zul]

bro dzul....im using svt too!! tat is isawara FUEL filter? and how many mm hose needed?tq

yup.. iswara fuel filter

u need same size hose as ur original hose

 

[blackcolour]

I got a friend which DIY and put a stainless steel bottle which they always use for bicycle drinking bottle make 2 hole one for engine piping goes in and for for return back to engine. At the top ofDdrinking bottle he put a mini airfilter for breathing. All the used oil will goes into the bottle and extra air goes back to the engine. No idea if this will increase the hp or hurt the engine or not. Sifu give some clues

 

[Izso]

I got a friend which DIY and put a stainless steel bottle which they always use for bicycle drinking bottle make 2 hole one for engine piping goes in and for for return back to engine. At the top ofDdrinking bottle he put a mini airfilter for breathing. All the used oil will goes into the bottle and extra air goes back to the engine. No idea if this will increase the hp or hurt the engine or not. Sifu give some clues

It will do nothing except catch the oil vapour. No increase anything and no hurt anything

 

[cvkit17]

Bro Izso, the pic showing your myvi oil catch tanks seems not right...the inlet should be the bottom and the outlet should be top. There's an arrow on top that indicates the flow direction. Doesn't really do any harm I suppose...just wana highlight. Awesome DIY btw. Thumbs up

 

[Izso]

Bro Izso, the pic showing your myvi oil catch tanks seems not right...the inlet should be the bottom and the outlet should be top. There's an arrow on top that indicates the flow direction. Doesn't really do any harm I suppose...just wana highlight. Awesome DIY btw. Thumbs up

Thanks for that. Will go back and make the changes!

 

[cvkit17]

Thanks for that. Will go back and make the changes!

Haha no need la..I think not much different as it is air that pass through the filter and the oil concentration should be not much..change when you change the filter haha. I just installed mine 2 days ago. Total cost: filter RM5, clips RM8, hose RM4/ft. Finding the best place to position the filter with my dog keep on disturbing me: priceless

 

[sarled]

Been reading all the posts. Very interesting. But no one mentioned that the PCV is just that - Positive Crankcase Ventilation.... i.e. it relies on the vacuum generated in the intake system to suck gasses/air out from the crankcase (the place where all your oil and bearings are). If the paper chokes up (due to heavy oil) you lose that vacuum almost imediately. It is only called "positive" because there needs to be a definite suction from the intake system. If there's no suction it won't be called positive.... it may be called ACV (atmospheric crankcase ventilation). So guys, be very careful. If your crankcase isnt ventilated by this suction, all your blowby gasses and heat generated by the engine has no where to go and end up generating oil leaks in many places. Also, a pressure in the crankcase will mean reduced oil return from your bearings (basically means less oil flow to your bearings).

A proper OCT has none of this paper stuff, so no risk of choking up and blocking the vacuum.

 

[D7zul]

Been reading all the posts. Very interesting. But no one mentioned that the PCV is just that - Positive Crankcase Ventilation.... i.e. it relies on the vacuum generated in the intake system to suck gasses/air out from the crankcase (the place where all your oil and bearings are). If the paper chokes up (due to heavy oil) you lose that vacuum almost imediately. It is only called "positive" because there needs to be a definite suction from the intake system. If there's no suction it won't be called positive.... it may be called ACV (atmospheric crankcase ventilation). So guys, be very careful. If your crankcase isnt ventilated by this suction, all your blowby gasses and heat generated by the engine has no where to go and end up generating oil leaks in many places. Also, a pressure in the crankcase will mean reduced oil return from your bearings (basically means less oil flow to your bearings).

A proper OCT has none of this paper stuff, so no risk of choking up and blocking the vacuum.

i agree with u..

i've been using the fuel filter to replace OCT.. but it doesn't catch any oil..

the oil get stuck on the tube b4 the filter..

so, now i need to search a cheap OCT to replace it

 

[Izso]

My fuel filters don't have any paper elements in them. The kancil and Toyota ones do have paper inside.

 

[cvkit17]

Shouldn't be a problem if the OCT is changed regularly, like 5k - 10k km distance? If let there for 10 years..sure die lah

 

[vr2turbo]

My fuel filters don't have any paper elements in them. The kancil and Toyota ones do have paper inside.

Then what is filtering the fuel (if use for fuel that is)?

---------- Post added at 05:47 PM ---------- 6 hour anti-bump limit - Previous post was at 05:41 PM ----------

Bro Izso, the pic showing your myvi oil catch tanks seems not right...the inlet should be the bottom and the outlet should be top. There's an arrow on top that indicates the flow direction. Doesn't really do any harm I suppose...just wana highlight. Awesome DIY btw. Thumbs up

I did mine some time back and also using the same filter and was about to say the same thing.
Well, for me it does make a difference. If go in from bottom inlet the oil is caught at the bottom of the container, the filter paper acts as a filter. If the tube goes in from the top, the oil will damp the filter paper before it can go down the container.....

 

[Izso]

Taikos... m-o-d-i-f-i-e-d filter.



I used to own a OCT but stupid me sold it. Now I'm too scrooge mcduck to want to buy another one.

 

[sarled]

Then what is filtering the fuel (if use for fuel that is)?

---------- Post added at 05:47 PM ---------- 6 hour anti-bump limit - Previous post was at 05:41 PM ----------



I did mine some time back and also using the same filter and was about to say the same thing.
Well, for me it does make a difference. If go in from bottom inlet the oil is caught at the bottom of the container, the filter paper acts as a filter. If the tube goes in from the top, the oil will damp the filter paper before it can go down the container.....

No doubt it may trap oil. I don't dispute that. It's just the loss of vacuum that I worry is being overlooked. If your filter paper/element gets wet with oil, you lose vacuum. If your filter container gets filled with oil you will also lose vacuum. With this loss of vacuum your PCV system isn't really working to bring air/gasses out of your crankcase. This means your oil flow rate to your bearings is compromised. Your main and conrod bearings are probably suffering and you may not know it. Yes, your engine works but do you really know how well your bearings are doing now? Think about it - don't you think manufacturers would have added a RM6 filter for this system if there were no risks involved?

 

[Izso]

Well, if any of these DIYers are like me, I have about 15 of those RM6 filters at home and change every month or so. Other times I just pour out the oil. And since my filter doesn't have any paper elements, I think the vacuum loss for me is minimal or none.

Just recently I inspected the hoses and the filter and found that the clamp around the filter wasn't completely sealing the connection between the hose and the filter so I could hear some vacuum noises there. Seems the rubber hoses will crack and become brittle over time. Lesson learnt is buy good hoses.