Project: RS2 ABY

[Sonic]

The catch-tank runs from a new head-breather at the back of the cam cover and from the block union to a swirl-pot, which has a sump-return hose and a hose to the catch-tank. The catch-tank then has a hose back to the MAF hose.

The PCV (if i understand the part correctly) still runs as-stock between the hose to the throttle body and the inlet manifold.

[Jamo]

It's not mine, it's one based on JP's swirl pot setup - looks like a swirl and catch setup from the pictures and conversation I've had with Andy.

The problem area is the N80 & 1 way valve setup that attaches to the IM.

OK, the one valve shouldn't be a factor if it's been put in with the carbon cannistor feed going directly to IM I would have thought then.

Really need to know the details of how the catch tank and swirl pot has been put in then.

[Jamo]

The catch-tank runs from a new head-breather at the back of the cam cover and from the block union to a swirl-pot, which has a sump-return hose and a hose to the catch-tank. The catch-tank then has a hose back to the MAF hose.

The PCV (if i understand the part correctly) still runs as-stock between the hose to the throttle body and the inlet manifold.

The block union is where the pcv would be, so is the swirl port taking the feed directly of the union of off the pcv valve?

[Sonic]

Your PCV valve is probably shot.
The one that is a one way valve at the manifold... replace it.

Your intake MUST hold pressure.

Would this make any difference to the IM holding pressure though, as it's a contained system, running from the throttle-body hose to the IM, so it doesn't matter if it was open or close as long as its not leaking?

[Rusty]

Ditch the OE stuff and make it as simple as possible to avoid cockups

• Fit the N80 directly to the IM with some 8mm pipe.
• Remove the PCV and 1 way valve.
• Blank the OE head breather, as you now have the larger one.
• Run some 19mm hose round to the low pressure inlet hose.

The breather hose you describe should flow to the low pressure side and not the high pressure side by the TB. It has a 1 way valve to the IM that stops the breather system being subjected to pressure - if this is faulty or not correctly fitted then it will leak.

Break the circuit down to its most basic elements and make sure that it's not connected to anything other than the breathers and you'll be able to eliminate it. It should not pressurise, so this is worth persuing.

[Sonic]

OK so the PCV is not the silver thing that sits next to the IM, between the throttle-body hose and the IM?

I'm just trying to see if i have any pictures of it all, but i think not. I'll get some tonight.. sorry for not understanding my own car guys

[Jamo]

Rusty beat me during typing exactly that Sonic you should be junking the OEM stuff

[Sonic]

I'm pretty sure that's what happened and is what i've got.

[Rusty]

That silver thing is the idle valve

The PCV valve is the plastic 90 deg mushroom looking thing that sits over the crank case breather

Where are you based now?

[Sonic]

Was just getting a picture of it - thanks Andy

I'm based in Buckinghamshire now, just down the road from Milton Keynes.

[Rusty]

Ah, that's not as local as I'd hoped. Oh well.

Take a load of pictures of everything and we'll see what we can see That's best.

Bo had an issue with a pressurising breather when he fitted a catch tank years ago - I think that was 1 way valve related; either it was faulty or not connected up properly.

[Rusty]

Here's a diagram

[Sonic]

Yes spot on... with slightly different pipe dimensions

I'm just uploading some pictures of the build now which will hopefully help.

[Sonic]

Ok hopefully these help to show how its put together -



Head breather:



Swirl-pot:



Block-breather:



Sump-return:



Swirl-pot, catch-tank and head-breather:



Catch-tank line back into the MAF hose:





WGFV and DV:

[Rusty]

Those Forge 006s can leak from the joint, best to check

Make sure that fabric hose isn't kinked, crimped or holed.

Some of the pics aren't working...

Need one of the back of the engine, showing the pipework.

Other than that, it looks OK from what's showing.