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oil breather pipe

Posted: Mon Apr 08, 2013 7:44 pm
by taylorstattoo
been thinking about the oil pipe breather that comes from the rocker cover and it seems everone says when using the m50 inlet on the m52 lump this pipe is to be connected to the air filter boot, my only concern is that small amounts of oil stuff come out of this pipe and i dont want that going back in to the throttle,, Is there a reason this needs to go there or can it go elsewhere or leave it unconnected ??

Re: oil breather pipe

Posted: Thu Apr 25, 2013 7:09 am
by hash
My understanding from other engines is the best thing to do with the rocker breather is to put it on its own small filter, same as you I don't like it going directly back into the engine.
I may be wrong for the BMW though.

Re: oil breather pipe

Posted: Thu Apr 25, 2013 7:44 am
by Motorhole
I thought the point was that it did go back into the throttle? Could always employ the use.of a catch tank instead.

Re: oil breather pipe

Posted: Thu Apr 25, 2013 2:10 pm
by Green
Actually, what is the best course of action for this as I just plumbed mine in like this as it should be. I've also recently removed the oil filter on my sisters classic mini and plumbed that back in to recirculate so it wouldn't perspire oil into the engine bay and cause a mess.

So I thought that having it going back through into the tb would prevent oil loss, and possibly cause some other good? Ebay filters scream "This is bad!" and I tend to just ignore what they say now as most of it just a scam.

Re: oil breather pipe

Posted: Thu Apr 25, 2013 2:27 pm
by Motorhole
I'm probably going to end up getting something like this:

http://www.ebay.co.uk/itm/BMW-MINI-E30- ... 48419d2a96

Plumb one port into the breather on the rocker and either put a breather filter on the other or plumb it into the intake. When it fills up, you empty - simple as :)

Re: oil breather pipe

Posted: Thu Apr 25, 2013 6:32 pm
by Brianmoooore
taylorstattoo wrote: my only concern is that small amounts of oil stuff come out of this pipe and i dont want that going back in to the throttle
Why not?

Re: oil breather pipe

Posted: Thu Apr 25, 2013 9:20 pm
by taylorstattoo
wont it start to clog up in the throttle after time or work its way in to the engine through the intake instead of clean air??

Re: oil breather pipe

Posted: Thu Apr 25, 2013 9:42 pm
by Brianmoooore
It's just a minute amount of oil - it won't clog anything. More likely to lubricate it a bit.
Yes, it will go into the engine. It's just another paraffin, the same as petrol, but with a longer molecule chain, and will be combusted in the same way.
You're trying to solve a non existent problem.