Oil Catch Cans

[ke30king]

hey guys, just wondering how many fellow Rolla owners have oil catch cans setup in there rollas. If you do can you post up a pic of it?

 

cheers, Lloyd

[Rolla__Boy]

Xany does

 

And I am about to...I am just going to run it from the pcv to the catch can and back to the breather

[demuire]

I do. Catches all sorts of ugly yucky stuff.

[Xany]

yup, i do.....

 

PCV valve - Catch can - back to breather.

 

however, i'm not sure if this would pressurise the can.....atm mine is just venting into the atmosphere

 

mine atm: PCV valve - catch can - Atmosphere.

 

i intend to plumb it back into the breather one day..

[Rolla__Boy]

It wont do any harm dude...I have seen it done before...

 

You intend to after I suggested it :D

[Trendact]

A lot of rally cars just run from the breather to the can to the atmosphere. A paint tin well do the job and it is cheap as (about $4 for a new un-used one from a paint shop), just drill a few holes in the lid so it can vent.

[Rolla__Boy]

See the problem with that idea is...it just doesn't bling :D

 

And it would need to have some sort of drift sticker wrapped around it :(

[Felix]

i just used an old small thinners tin. i drilled a few holes in the lid and made a filter out of a bit of foam to go under the lid. took me about 10 minutes to make it. with mine i just wrapped it with foam and duct tape. it just stuffs in the corner between my radiator and washer bottle, no mountings needed.

 

i found i had to drill the guts out of the PCV valve. it restricts flow to much at 8grand.

 

nothing flash looking, but has worked a treat for the last 5 years or so. :D

[Rolla__Boy]

I don't know that 5 years of operation is enough evidence for us dude...Let us know if it's still going in another 5 years :D

[Felix]

no nancy boy bling drift crap on my car. :D

[ke30king]

so this is how it should be done? where abouts are yours mounted?

[Rolla__Boy]

Then a line from the catch can back to the breather on the rocker cover. Cleaner that way

[Super Jamie]

i found i had to drill the guts out of the PCV valve. it restricts flow to much at 8grand

it's designed to :D but i'm sure you know how a pcv valve works

 

i am of the opinion that a catch can is pretty useless unless you plumb it back to manifold vacuum, i wouldn't just make an atmo-vented can on anything except a dedicated racecar, or at least something that gets its oil changed every 1000km or so

 

you really need extra help to suck the impurities out of the crankcase on a motor that's getting oil changes every 5000km or over, or you just chop the oil out way too fast

[Felix]

the pcv system normally works on vacuum. if you have a vacuum guage you will note that under full throttle there is no vacuum. crankcase pressure is at its worst at full throttle, when the pcv system works the least. at full throttle the crankcase pressure pushes the vapour out, not manifold vacuum drawing it out.

 

i had an oil leak problem when giving my old 4k an extended caning (ie, using the inbuilt rev limiter :D ). ended up it was not able to relieve crankcase pressure, and would lift the dipstick. gutting the PCV valve stopped it happening.

 

have you ever seen the crap that ends up in a catchcan? you don't really want to introduce it to your combustion process at full piss. oil vapour increases the risk/ onset of detonation, and is the equivalent of lowering the octane rating of your fuel.

[Super Jamie]

exactly the purpose of an oil air separator. to separate the oil from the air, and feed the air back to the engine