think ive discovered what my "secondary" catchcan is for!

[cantfindausername]

I would have been concerned about plumbing something into the exhaust. Would the exhaust pressures not be greater than the PCV? i.e would the exhaust not be pushing gases back into the engine?

[greeny]

Well if its the sump then it'd just be breathin through that can and back into the intake, same as the oem can does but just through the head/cam cover.

Not sure on why itd be connected to the downpipe?


If your engines healthy, with little to no blowby then id do away with it all and just put a filter on the cam cover/oem catch can.

[cantfindausername]

Having one on the sump too will just help to reduce the pressure in the engine. Just from the bottom of the engine as well as the head. Seems simple enough. Don't know why there is all this talk of downpipes though

[jimGTS]

i just mentioned exhaust, as i found that stuff on the US forums....


why would anyone want it hooked into the sump tho as well with another can?

is it all an emissions thing "only" you think?


when people say the sump, would the pipe be t-d off of another stock hose, if not, would the sump have to be tapped into in order for this pipe to exist? seems extreme.


ive got some cool new ramps coming today, big enough for 9.5inch tyres (unlike most small ramps), so will have a look on sunday for sure.

but keep the info/ideas coming.

[cantfindausername]

The way I've had it explained to me is that each time the piston moves, it has to displace the air beneith it. That is where the need to vent the Crankcase comes from. Venting this reduces the pressure against the piston allowing it to move quicker. I've heard of some people runninig dry sumps to a point of vacuuming the crankcase, essentially removing the resistance against the pistons.

I would think you'd need to have a new connection on the sump for your set up Jim.

Get under there and get loads of snaps.

[greeny]

i just mentioned exhaust, as i found that stuff on the US forums....


why would anyone want it hooked into the sump tho as well with another can?

is it all an emissions thing "only" you think?


when people say the sump, would the pipe be t-d off of another stock hose, if not, would the sump have to be tapped into in order for this pipe to exist? seems extreme.

The only reason i can see the need for another breather in the sump is if they were havin problems with crankcase pressures?

The only thing for emmisions related is the need to plumb them back into the intake afaik.

On the rev3's dont they already have two breathers off the cam cover anyways?

[greeny]

On a side note, wasnt it you that had problems with your dipstick popping out Jim, or am i getting confused

[jimGTS]

there is a pcv valve on the other side of the camcover afaik.
i checked it out the other day as i just wanted to know its purpose.
camcover to IL, no resistance
IL to camcover, some resistance, until i blowed hard and i must have closed the valve as i couldnt breath through it. so an guessing it closes at a set psi..

could i in theory then, now ive caught up of your comments, put 2 breathers pipes on there?? one for each can? and block 2 of the pipes to the intake?

then mot time, just hook it back up.
(tho am guessing im gona need to do more than that to get it through the emissions, lol)

[Bender Unit]

All seems a bit random to me, its definatley not a catch can as its not inline from the PCV so wont be doing anything there. Looks like it has a second outlet so until you know where it goes its all guess work.

[jimGTS]

All seems a bit random to me, its definatley not a catch can as its not inline from the PCV so wont be doing anything there. Looks like it has a second outlet so until you know where it goes its all guess work.

any more ideas considering the comments above from greeny and cantfindausername..

[Razor04]

jim why not route the stock catch can directly across into the secondary catch can, n bung up the left pipe on the intake? you can also run the stock can out into a bottle instead of using a breather filter, this is what you'd be effectively doin.

[steve b]

Why don't you just look where the pipes go rather that trying to guess, probably take all of 30 seconds and be done with it.

Back to sump could be the drain for the catch tank.

[Bender Unit]

Back to sump could be the drain for the catch tank.

But what is it catching? Its not inline form the PCV. If it is connected to the sump I would assume its a secondary PCV (working from the sump upwards) - which would imply that the engine is getting alot of blow by and they are trying to reduce the pressure build up in the engine?

[jimGTS]

BU, if that is the case, am i free to fit 2 filters, one on each can, and just block the 2 pipes they use on the intake?

i guess could indicate blowby, but in turn could be helping out the engine more than standard by releasing these pressures/gases at the sump end.

[Driftlimits Performance]

yeah Jim, just get under the car! Stop all the hypothetical guessing and maybe ifs.

[jimGTS]

i will, i will...

[simmo490]

i w ould say its just hooked in to the sump and doing exactly what the OEM catch can is doing but a more direct approach.

If thats the case the OEM one is sufficient for the whole job.

something mentioned above, were you having the dip stick push out???

[jimGTS]

on occasions very slightly yep.

[simmo490]

hmmmmm,

if that pipe is going to the sump, block it off and see what happenes? i.e does the dip stick now shoot out??

if so i wonder if for some reason your engine is breathing heavy and they have fitted it to overcome it.

weather it be a fault with the car or some kind of piggy back mod to overcome a performance part like pistons/rings with high blow by??

[Razor04]

if it is blowing into the sump that could be why your dipsticks poppin out?
gas has gotta escape somewhere hasnt it?

if its venting OUT of the sump then that explains the purpose of the secondary catch can