Mark's Catch Tank

[Doug_RS2]

Mark - Can you please remind me how you connected up your catch tank?

Can you take pics of the where the 2 hoses come from on the block that goto the 2 inlets?

Is that metal pipe going through the rocker cover not used at all?

Does your catch tank drain plug have a one-way valve in it for putting the oil back in through the sump plug - I'm not sure I understand how you don't get oil coming out of that ?

Myself and greg are planning on doing this and Greg has explained it to me, but I just can't picture it

[Greg_S]

Doug, to start with not going to use the oil drain, instead see how much oil collects in there before make the drain if need to.

Idea for the breather just seen though which goes from the cap of the tank.

Breather ]breather[/URL]

[Greg_S]

try this

http://200sx.kicks-***.net/album/alb...ame=miss_nismo

[S2 Ant]

Rahhhhh that looks awesome!!

[Doug_RS2]

That looks awesome - but how is that plumbed in? Is that just using the pipe in the rocker cover to vent off the top of a catch tank?

I wasn't planning on doing the oil to sump plug yet either - just wanted to know how it worked. I have seen a sump plug that has a valve that connects to a push on 1/2" connector - that would do the job - if we go that route.

[Greg_S]

yeah just using that one as a vent pipe, means it keeps the fumes away from getting sucked into the heater blower. But the pip that would norm connect on back of cam cover goes to catch tank and the one from side of block. then the breather cap would connect where that little filter is.

Greg

[blu_s2]

replacing the breather system with a catch tank was on my wish list as well after seeing Mark's motor. Can you guys keep me informed on how your doing this.
thanks in advance

[Greg_S]

Will post a how to guide up as i do it, just goto remember to take some pics as i go. Shouldnt be too difficult to do, and mark has offered to give me a hand with the drain etc if i need it.

Greg

[Doug_RS2]

Yeah - I'll take some pics as well.

Greg/Mark - Can you explain what hose we disconnect and connect to the 2nd input if the catch tank - and what happens to the other hose that will be disconnected - Still confused :confused:

[S2central.net]

AFAIK - a crankcase breather like that which vents to atmos will fail the MOT in UK. My old Coupe failed for just that many years ago. Think it needs to be a sealed system like MarkH in order to appease the testers... Not sure though !

I was wrong about the CO levels on ABY aged cars wrt MOT tests - so thats my disclaimer.

Cheers,

Paul

[Doug_RS2]

Originally posted by S2central.net
AFAIK - a crankcase breather like that which vents to atmos will fail the MOT in UK. My old Coupe failed for just that many years ago. Think it needs to be a sealed system like MarkH in order to appease the testers... Not sure though !

Do you mean we have to put a filter on it like Marks to pass an MOT?

[S2central.net]

@ DOug -

From the location of the little breather filter on that odd purple engine you showed, there is a pipe which runs inside the cam cover to a connection at the rear of the cylinder head. It is the pipe which normally attached here that goes to the breather input.... I think.

Idea being that you don't let the crankcase fumes and potential oil mist into the inlet manifold for combustive discharge.

The catch/breather tank should have a drain at the bottom which allows any oil blow-by to return directly to the sump and a filtered vent system that disposes of the crankcase gasses. Think Mark employed a spare hole on the inner wing for this purpose with an effin-big braided hose to the tank breather.

This is why Mark's system is MOT legal in deference to a dumb vent filter - the catch tank ensures that any oil is collected and re-used - it is not blown out to atmosphere.

That's how I remember it anyway - need the word from Marky boy himself.


Cheers,

Paul

[Doug_RS2]

Ok - I see what you mean.

Do they wave a gas meter around the engine bay during an MOT to detect leaks/gases ?

[Greg_S]

Just been had my car MOT'd, passed with flying colours once the cats where hot enough.

But on the subject of the breather mod, according to the MOT and legal side marks isnt legal either. To be technically correct it must vent back into the inlet. But it isnt part of the MOT to check that necessarily so could probably get away with it.

The problem comes on emmisions if engine is good that thats fine but if engine is getting worn etc it will probably fail on CO on the emissions if its not fed back into the system.

Paul is right on one of them pipes from back of rocker cover, the other comes up from side of the block.

@paul/martyn/mark H, have you got any diagrams laying out how the breather system is piped up as standard?

Greg

[martinjs]

heres a link to graham goodes site explaining breather systems,
i know its for cosworths but the basics are the same, quite interesting.
Graham Goode
choose breather system from menu

martin