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Ew10 Breather Setup - Catch Tank Over Fill Issue?


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45 replies to this topic

#1
sam jfm

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Morning All,

 

Can any of you shed some light on my problem?

 

I may have an issue with my gti180's breather setup.Yesterday whilst on an event. My best deduction as to what happened is the engine filled the catch tank, and then chucked about a litre of oil out of the top of the catch tank (oil everywhere,smoke, the works).

 

I am trying to get to the bottom of why it has happened, the catch tank is plumbed up as follows. Two inlet manifold breathers blanked off, cam cover breather and the breather on the side of the head connected together and plumbed into a catch tank. The catch tank then returns to the sump.

 

 

I am thinking have misunderstood how the breather setup works on this engine. Or maybe it was something stupid like overfilled with oil (although i still wouldn't expect it to lose containment in such a big way!)

 

All advice appreciated.

 

Sam

 

 



#2
dcc

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Sounds like you have a lot of piston blow by, but some is to be expected.

The breather / catchtank system seems sealed and you have no vent to atmosphere. Where does the build up of pressure go? Contually building by piston ring blowby. Personally I'd introduce a t piece back to your inlet for the release of pressure in the crank case, oil vapour would be burnt, else you'll just get compound pressure build up

#3
sam jfm

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Thanks for your reply,

 

The catch tank/can has a breather in the top to release any pressure buildup.(it's a Mocal one)

 

I can't figure out how I ended up with so much oil in the catch tank, and out of it - unless something strange happens at high RPM. I initially thought that it must be piston blowby, but the engine doesn't breath noticeably at all.

 

It's as though oil is getting stuck at the top of the head at high rpm maybe? or the oil is being forced up the return to sump pipe and out of the top?



#4
dcc

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Well the ew10 has 2 large oil return galleries, i have a few heads and block kicking round so will have a look later to see if anything obvious from your description, the only thing I can suggest is you have a lot of oil pooling at high rpm.

Potentially your system cannot offload the pressure quick enough.

#5
Tom Fenton

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Most breather filters are just not sized big enough. Why have you altered it from standard? To be honest you are probably better putting it back, as you are finding quite a bit of thought is needed to make a breather system work properly, part of it is separating the oil from the air efficiently so you don't blow it out of the engine, at the same time it needs a large enough bore breather. Most of these so called breather filters have a pathetic small bore of something less than 10mm at the smallest point be it breather rubber or hose stub. Just not big enough.

#6
sam jfm

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Thanks Guys,

 

The reason I changed it was because it was a mess, and I was trying to simplify. Reading around about fitting throttle bodies to the engine it was suggested that you could get away without using the inlet manifold breathers. so I did!

 

 

The breather pipes from the rocker cover and the head are half inch, which is the same as the standard hose.

 

I am intrigued to find out what is causing the problem and why. 



#7
dobboy

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Malc just had a similar problem, but not as severe sounding (but oil was filling up the catch tank and messing up engine bay), and it was a piston ring, on a charged XU10J4RS engine proved by a compression test.

#8
calvinhorse

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Is your catch tank mounted as high up as possible, does the oil have an easy return path to the sump?

#9
sam jfm

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Is your catch tank mounted as high up as possible, does the oil have an easy return path to the sump?

 

 

yes on both counts! As high as I can get it, and a 19mm id pipe back to the sump.



#10
calvinhorse

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19mm sounds very small, is the the size of the pipe into the sump?
Actually that's not terribly small

#11
sam jfm

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it's the same size as the drain boss on the sump



#12
dobboy

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Can you read the oil pressure from the dash/cockpit?

#13
RossD

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Have you blocked off the two circular breathers on the inlet manifold side of the head? As standard, there are drillings on the manifold which connect to the standard catch tank setup. If so, I suspect this is your problem, these relieve crank case pressure via the PCV valve on the standard setup.



#14
dudaionescu

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Hi Sam,
If I were you, I would immediately have an engine compression and leakdown test. Most probably you have a cracked fire ring in one of your pistons and there might be still hope you can save the engine. Forget the PCV, it's designed only for fumes, when you have liquid oil spurting out from there then you're in big trouble. One more sign: oil cap smelling strongly like gasoline.

#15
dcc

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Are you running vvt?

#16
welshpug

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Just what I was thinking now :lol:



#17
dcc

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Haha

#18
Schumi

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Are you running vvt?

Are you thinking its removed VVT but not fill the hole of selenoid ?



#19
dcc

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If you remove vvt you need to leave solenoid in place, problem you have is full oil pressure without restriction to head. This then fills the head with oil, the returns can return oil fast enough to sump. The beathers get used as a oil pipeline back to the sump, filling any breather set up. The head fills within seconds. Had personally seen it myself.

The cure? Leave vvt solenoid in place when removing the vvt pulley.

#20
sam jfm

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I believe that my VVT is still in place, how would i check to make sure?