Do I Need A Catch Can?

[R338OY]

What is the benefit of putting a catch can on my RB25 with only light mods (intake/exhaust/boost)? Is there a point? A mechanic told me its a good idea but i'm not sure myself if there is a benefit with the engine staying around 200rwkw.

Any advice?

Thanks

[H@ME]

few topics on this atm, but i say it can't hurt mate!!

[The Mafia]

I'm running 300rwkw and I still don't have one.

[R338OY]

I'm running 300rwkw and I still don't have one.

Fair enough. I know my 33 can get by without one too, but is there a benefit? Is it only essential for big power?

Or is it being pedantic?

[H@ME]

well it recommended for cars with bigger power, however i cant really hurt having one installed, the other topic further down talks about positioning of them and what to hook up where any more advice in this thread would be appreciated!

[R338OY]

Well even on lesser power RB's do the oil vapours recirculating into the intake plenum have a negative impact on power making?

[H@ME]

/\/\ x2

[dmr]

catch cans collect the oil, moisture and gas that causes crap to build up in your intake. i think they're a great idea even on low powered cars

[R338OY]

catch cans collect the oil, moisture and gas that causes crap to build up in your intake. i think they're a great idea even on low powered cars

So really all you're getting is lowered maintenance intervals? i.e. throttle body cleaning

It's not a major issue for most Skyline owners i take it

[H@ME]

i just finished mine then in this thread http://www.skylinesaustralia.com/forums/Oi...ug-t129549.html

[R338OY]

i just finished mine then in this thread http://www.skylinesaustralia.com/forums/Oi...ug-t129549.html

Just saw it, left a reply.

I'm still 50/50 whether it's a necessary mod on a mild setup

Someone convince me

[limpus]

Oil vapour being injested can cause detonation...so if you can somehow reduce the amount injested by using a catch can or similar why wouldn't you...its not limited to high power cars...and its got nothing to do with lowered maintenance intervals...but with almost any mod...its not necessary...

Edited November 14, 2007 by limpus

[dmr]

So really all you're getting is lowered maintenance intervals? i.e. throttle body cleaning

It's not a major issue for most Skyline owners i take it

it's not a major issue as such, but it's a good upgrade with bling factor for a little extra health for your engine

[Fixxxer]

Don't know if this is true, but I have heard that the 'effective' octane of fuel is reduced by oil vapours, including reducing the amount of oxygen available to burn.

Don't think it can hurt to have one, but as to how much HP you gain, is up for debate.

Fixxxer

[FATAZZ]

wheres SydneyKid?

[R338OY]

Don't know if this is true, but I have heard that the 'effective' octane of fuel is reduced by oil vapours, including reducing the amount of oxygen available to burn.

Don't think it can hurt to have one, but as to how much HP you gain, is up for debate.

Fixxxer

That makes sense. I guess it would come into play when the oil gets HOT, when your redlining it.

That's pretty convincing from a performance POV...

They're going on Nengun yeh?

[dmr]

Don't think it can hurt to have one, but as to how much HP you gain, is up for debate.

performance gain would be next to nothing, even in high powered cars.

[paulr33]

it wont add any power at all

if you do fit one and it keeps filling up time to fix the source of the problem

some people fit them to catch heaps of oil in the intake, this isnt a fix its just masking the problem

it could be shagged oil seal on the turbo etc

[limpus]

^^^ Agreed...if a catch can keeps filling up then there is something more serious going on...

However...if for some reason you are getting some blow by and it is being ingested into the engine...then it might cause detonation...with a catch can in place...you will not get any performance gain at all...however...if you stop the blow by from being ingested...your detonation threshold might go up and you might be able to run more timing...hence getting a performance gain...the gain is not from fitting the catch can...but its from the catch can doing its thing hence allowing more timing to be added...

Edited November 14, 2007 by limpus

[Dose Pipe Sutututu]

IMO I believe they are worth fitting... it keeps your plenum nice and clean, no matter how new a motor a small amount of the oil will evapourate.