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Author Topic: catch cans  (Read 4966 times)

BUC957

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catch cans
« Reply #30 on: August 10, 2012, 06:21:49 AM »
That's well and good and i have learn't more about it, but i still need advice on a cheap effective can with breather port and two inlet's to replace k factory one.

AGRORB

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« Reply #31 on: August 10, 2012, 08:31:40 PM »
Is it giving you headaches? Honestly, traces of oil in the hoses is nothing, a lot of its probably from vapour anyway.

Save yourself the hassle n money n keep it stock and tbh, if your car has that much blow-by, you dont need a catch can....

You need a rebuild.
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gtsr

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« Reply #32 on: August 10, 2012, 09:12:10 PM »
Best way is make your own catch tank. Below should give you an idea on how it should be designed if recirculate blowby like factory setup (emissions).

Be aware that most cheap intercept oil type catch tanks don't have a baffle plate to separate oil (oil can go back into intake). They are more show than function.

Some pull them apart and fit a baffle plate at top of catchtank, between fittings (oil / blowby enters catch tank and oil hits baffle plate and oil drops to bottom of catch tank. Then blowby goes under baffle plate and up, out the other fitting on catch tank) -

http://www.skylineowners.com/forum/showthread.php?t=170465

Edit: The baffle plate in link above has holes in it for blowby to go through, but should be a small piece of metal at top of catch tank, so blowby + oil has to do 90 degree or more turns thus separating oil from blowby.

If want to run catch tank similar to photo in Badhabit's post (vents gasses to engine bay), this catch tank in link below has no baffles or filter material inside, but does have a breather filter on top and two inlets (one from each camcover) and is cheap, 2 litre -

http://www.ebay.com/itm/2L-2-LITRE-ALUMINIUM-POLISHED-ROUND-OIL-CATCH-CAN-TANK-WITH-BREATHER-FILTER-/330658330734?pt=AU_Car_Parts_Accessories&hash=item4cfcc5b86e

Can buy it in NZ -

http://www.drivenperformance.co.nz/scripts/prodView.asp?idproduct=1443

Probably would need to replace 12mm, 15mm barbed fittings supplied with above catch tank with 16mm OD barbed fittings or AN fittings + adaptors, as stock breathers are 16.5mm OD and use 16mm ID hose. But probably are getting a smell in engine bay, as mentioned by AGRORB.

I think with over 2000cc engine it has to be 2 litres minimum for catch tank, so above catch tank should work. Probably would need to cut top off, fit baffle plate, weld back together if use for venting blowby gasses into intake (emissions). But be aware that some cheap catch tanks use thin metal, so might be difficult to weld back together.
« Last Edit: August 10, 2012, 09:28:26 PM by gtsr »

westybob

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« Reply #33 on: August 10, 2012, 11:11:29 PM »
I may be able to sell you a catch can - I have three and am using 2 on my car.

If you don't have major blowby you should retain the PCV valve in its stock configuration ( I have one of those too if you don't)

Then you need a catch can which you can open - some have tops and bottoms that screw on or you can cut the top off fit the baffles and weld it back on.

You don't want a breather. Apart from being illegal (unless you have a cert and a log book etc) you will get nasty fumes in the car.

So you want 2 16mm outlets and seal the top . Combine the 2 cam cover breather hoses and run them into one side of the catch can. Use the other as an outlet and run it into the inlet pipe. Weld a fitting on if necessary.

This is for your car with a small amount of blowby. For a track car pumping litres of oil out the top it will be different.
« Last Edit: August 11, 2012, 05:21:38 PM by westybob »

gtsr

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« Reply #34 on: August 10, 2012, 11:48:00 PM »
Best to keep PCV, especially if idling alot in traffic. Catchcan is on exhaust side to catch oil at higher rpm.

This is a cheap custom catch tank for CA18DET, but same design with baffle plate in middle and at top -

http://www.turbophile.com/technical/diy_catch_can.html

Instead of using filter as shown in above link, reroute back into intake via adaptor, AN fitting, 16mm ID hose that clamps onto 16.5mm hardpiping that goes to intake (on turbo engine).

BUC957

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« Reply #35 on: August 12, 2012, 12:45:43 PM »
Quote from: BUC957;603457
###hey guys i have a blocked factory pcv and catch can in another car.### am looking for a two port with breather port. anyone know where to get one cheap?


As stated its in another car not my skyline. to replace the system the intake manifold and everything associated bar the turbo has to be removed. I'm trying to eliminate the possible need to do again in the future with an aftermarket can and sdu up.

need two inlet ports and a breather.

westybob

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« Reply #36 on: August 12, 2012, 02:12:01 PM »
$40 posted.
Height about 200mm without breather diameter 80mm without fittings.
Has two outlets, sightglass, fixing bracket drain on bottom and (blue) screw top.
I'll throw in the Moroso breather which fits in the top with a rubber seal.
Top and bottom come off so you can just fill it with stainless scrubbers if you want.
The marks are where the label was but its aluminium so it will polish up if you're keen.
« Last Edit: August 12, 2012, 03:26:32 PM by westybob »