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Water In Oil Catch Can


speedtripledan

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Not sure about this one, catch can is attached to the crankcase breather, then vents to atmosphere. My catch can keeps filling with water, no oil what so ever just water. Any ideas ? I.m not loosing coolant, nor am using oil, there is no emulsion on the filler cap etc so doubt head gasket. Strangely the water is not pink either (antifreeze colour) is this a by product of forced induction?

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It does sound like condensation caused by hot vapour from the breather causing condensation in the can.

Bit like a dehumidifier.

It's strange that once the can gets hot the water doesn't evaporate off though.

 

It might be worth conducting the chemical test using indicator fluid (just to confirm that there is no exhaust gas in the water). Indicator fluid is available from Frost Auto.

 

Supercharged air is colder (through intercooler if fitted) and hence is denser and in damp conditions could this carry more excess water vapour that is 'dropping out' (condensing) in the can? It'll be interesting to see the difference in 'dryer' conditions.

 

Or am I barking up the wrong moon???

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IMHO it will be condensation from the cold startups. Blown engines tend to

Have more blow by than NA engines. Seriously blown engines have to have a crankcase

Vacuum pump to prevent oil seals blowing out. The catch can won't get hot

Enough to to evaporate the water, it just needs to be drained occasionally

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I wouldn't bother with a catch can unless I was routing the air from the other side back to the inlet manifold. That causes positive crank case ventilation then. Without PCV a catch can is a pointless exercise IMHO. Just fit a breather filter and job done. PCV is common on force induced engines to protect seals and according to some reduce ring flutter. (In the engine not driver seat)

I am against routing back to the inlet manifold personally because it just puts dirty air into the clean side and cacks up the manifold and head. It's not however environmentally acceptable to vent to atmosphere apparently lmaooooooo. I would rather risk seals and vent to atmosphere.

The only upside to a catch can is that used your engine is suffering blow by you can get oil dripping from breather filter. Never had it happen personally tho.

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