Hi, recently put a 2.5 block in my P1 and its been leaking oil on idle, so I haven't bothered to drive it or have it mapped yet! Spent ages looking for the leak and couldn't find anything. Went away on holiday and when I returned found water in the oil, thought thats odd, but it had been raining really hard and the cars parked outside. Anyway had another good look last night and found the pipe in the picture below (really hard to see becuase the manifolds in the way). This pipe wasn't on my EJ20 engine and some how when putting the engine back in we didn't notice there was nothing attachtedto it so oil is leaking out and water is leaking in it! Can someone please tell what should go on it and where it should run to! Thanks

 

Just block it off.

 

The pipe in the centre of the block is a breather outlet which should be vented back into the induction inlet system or a oil catch tank .

 

cheers for the replies, but I got 2 different answers at the mo

 

I blocked of that breather on my 2.5 conversion.

 

Cool, what did you block it off with

 

I've been told by a guy in the know that its a balance pipe for the head breather pipes - I found a reasonable amount of oil comes out of that pipe so not recommend blocking off. I fitted the big crank and that pipe plus the headers all together and straight to an oil catch tank...works well, oil collects and nothing drips out of the filter at the end of the line in the wing.

 

What if you don't have an oil catch can?

 

Couple of choices really, plumb the pipework out the wing or under the car and fit a filter at the end (just incase it sucks air for some reason) or flow back into the pre-turbo pipe - depends on what bhp/boost you're running I guess as higher horses will mean more oil pushed up the pipes and you wont want that being sucked back into the inlet. I found my old engine with 350 horses had oil in the manifold, more than I was happy with. Or, buy a catch can, most professional choice but most expensive.

 

Depends what heads you've got.
If you have the later heads with twin breather pipes out of the top, then one off each head (think it's the rear ones) should be T'd into this block breather.
As you said, it's a balance pipe.
If you have not got those heads then you can either send it off to a catch can or block it off, it matters not.


Andy

 

Thanks for the advice people, we've already correctly connected the breathers from the original P1 heads, so I think I'll go with blocking it up until I can afford to buy and fit a catch can. Thanks

 

As long as the P1 breathers are connected to the block breather to the left of the one indicated, and the other blocked off, it will be fine.

I have done both of my classic conversions like this, no problems...

 

Mine doesn't have the dual breather pipes and I still get "flow" from the balance pipe (I could easily tell that as the hose I used wasn't a perfect fit and was leaking oil onto the block until I fitted a clip), I'd connect all of them but choice is yours!

 

Confused

 

Flip a coin m8, connect balance pipe to all or dont...doesn't seem to matter either way but I know which I prefer.

I wonder what the air "flow" through the inside of the engine is like with and without all pipes connected...guess you'd need to understand how each bit interconnects to figure that one.

 

Is yours not a 2.5 then...??

 

It sure is a 2.5L but not the new models, its a 2L car shell with a shed load of mods, my heads are 2L but with wild cams.

 

agree

it is the balance pipe for the 2.5 heads.. you don't have them so you can block it off, as long as crank breather is connected to other connection

 

Just block it off. It will be fine. no need to be confused.

 

Not to keep this topic going and going but just to add my two pence again, I've not got the balance pipe connections on my heads but I def get flow from that balance pipe - so, choice is yours, block or connect, I did the latter and happy with the results as the oil catch tank is collecting as it should.

 

That breather is right above the crank, so most of the oil is what is thrown up off the crank.

I also run a breather catch tank, but off the other breather.

I have never got any oil in the tank, and the engine never uses/loses a drop of oil.

 

better to keep oil in the engine than catch tank

 

lol, I'm only talking small amounts here...just confirms flow to catch is working correctly.

 

lol