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Author Topic: catch cans  (Read 4926 times)

BUC957

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catch cans
« on: May 18, 2012, 11:38:58 AM »
catch can. do i need one? what does it do exactly and how is it hooked up?

BADHAB|T

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« Reply #1 on: May 18, 2012, 12:09:04 PM »
Unless you have blowby you don't "need" one
The plumbing method varies depending on the type of catch can you buy. They come vented and sealed.
It basically replaces the PCV system in the car

frost.motorsport

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BUC957

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« Reply #3 on: May 18, 2012, 02:44:43 PM »
I have a 20 de all that seems to be for turbo's

westybob

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« Reply #4 on: May 18, 2012, 03:10:03 PM »
If you needed one you would know. They are not a fashion accessory don't bother.

zifzone

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« Reply #5 on: May 18, 2012, 03:11:07 PM »
Nah fashion accessory would be using a v can or a redbull can :P
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BADHAB|T

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« Reply #6 on: May 18, 2012, 03:29:51 PM »
Quote from: BUC957;599081
I have a 20 de all that seems to be for turbo's


Definitely not a turbo specific thing, you can fit one to any engine :)

This is how mine is set up... I'm only using one because of the front facing plenum - it was in the "too hard basket" to replicate the factory PCV system, so I replaced it with a catch can


Harley

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« Reply #7 on: May 18, 2012, 03:30:39 PM »
your catch cans on the wrong side...

BADHAB|T

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« Reply #8 on: May 18, 2012, 03:41:34 PM »
lol I know it needs moving... but I need DE breather nipples to make that job easier
It doesn't "catch" anything anyway so I'm not too worried about where it is right now :)
« Last Edit: May 18, 2012, 03:44:33 PM by BADHAB|T »

Harley

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« Reply #9 on: May 18, 2012, 04:08:31 PM »
Lucky for some, I Had to install a drain back to the sump on my one!

BADHAB|T

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« Reply #10 on: May 18, 2012, 04:11:06 PM »
Quote from: Harley;599094
Lucky for some, I Had to install a drain back to the sump on my one!


Because it was filling up fast?
Ouch :(

Harley

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« Reply #11 on: May 18, 2012, 04:17:40 PM »
Quote from: BADHAB|T;599095
Because it was filling up fast?
Ouch :(


Yeah, i could have put in smaller restrictors into the block lol :)

rrcredline

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« Reply #12 on: May 19, 2012, 07:58:12 AM »
I have used two of the ones from SuperCheap. Neat little cans. One for the   R32 - RB30DE that I took all the breather plumbing off the top of the engine to have a clean look. The crank case breathing system has been rerouted out of the backs of the cam shaft covers via alloy pipes inside the covers from the splash shields and then to the catch can. Cert required me to plumb the catch can back to the intake. Which I did to get the cert. I noticed the other day however the pipe and fittings that went back to the intake have gone missing....don't know what happened there :>) It's just vents to atmo now.

Used the same Supercheap can on the R33 - RB25DE track car and same clean plumbing system and vent to atmo. This can get about 1/2 a cup full of oil every 3-4 track days as the engine rings are getting tired so a little more blowby then normal.

Worth having on any engine and by not sucking the crank case fumes back into the intake the intake stays nice and clean inside.

Just a note to on the oil restrictors between the block and head. I regret using them since I used the stadard RB25 oil pump on my RB30DE and the engine is not a high RPM application. I am not getting oil flooding in the head in the R33 track car that has factory restrictors so I do not intend to use special restrictors for the RB30DE engine when I build it for the R33. I will rather add the additional head oil drain back to the sump.

Nigel
« Last Edit: May 19, 2012, 08:03:51 AM by rrcredline »

westybob

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« Reply #13 on: May 19, 2012, 07:51:18 PM »
Quote from: rrcredline;599128
Just a note to on the oil restrictors between the block and head. I regret using them since I used the stadard RB25 oil pump on my RB30DE and the engine is not a high RPM application. I am not getting oil flooding in the head in the R33 track car that has factory restrictors so I do not intend to use special restrictors for the RB30DE engine when I build it for the R33. I will rather add the additional head oil drain back to the sump.

Nigel

My research and experience with the RB 30 with a high output pump (N1 in my case) tells me that the the head drain doesn't work. Some people think it acts as a sump vent but that is not good either as I think it just blows more oil out the top breathers. If you have a high output pump and run at WOT for extended periods (generally this will happen only on the track) you will need restrictors. I have hydraulic lifters and have two x 1.0mm restrictors.

If you are doing a new engine it is a good idea to drill out the oil return holes to 9.5 or 10mm and relieve the area around the other drains. What solved my excessive oil in the head problems as well as the restrictors was 2 x 20mm breathers from the sump going not to the head but to a catch can. The 30 crank whips up a storm and there is a fair amount comes out of those breathers (and its not blowby as I have done a leak-down test and it was fine).

I have one hose going to the top of the catch can and one to the bottom. As I do not have an extended sump (as really one should have for track work) I fully or slightly over fill the sump and under some conditions oil gets pushed out the breathers so the bottom hose allows it to drain back.

With this arrangement I have been able to complete a full track day without exiting in a cloud of smoke with oil coming out everywhere on top of my engine for the first time in ages.
« Last Edit: May 19, 2012, 07:53:58 PM by westybob »

frost.motorsport

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« Reply #14 on: May 21, 2012, 11:35:49 AM »
Quote from: westybob;599152
My research and experience with the RB 30 with a high output pump (N1 in my case) tells me that the the head drain doesn't work. Some people think it acts as a sump vent but that is not good either as I think it just blows more oil out the top breathers.


I run a -8 from the front/right of my RB26 sump up to my catch-can.  Works nicely, though I have a Tomei sump baffle which helps stop the oil sloshing up there anyway...

I spent a long time investigating this issue while building my engine and came to the conclusion that the sump vent is the way to go.  

Interested to hear about other peoples experiences on this!
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