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 Post subject: catch can
PostPosted: Thu May 17, 2018 2:57 pm 
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Joined: Sat Aug 01, 2015 4:37 pm
Posts: 6
Location: maitland nsw
Fitted a HPD catch can 4 weeks ago, Checked it to day and found water on the dipstick. Is this normal or should i be worrying?


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 Post subject: Re: catch can
PostPosted: Thu May 17, 2018 3:35 pm 
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Joined: Tue Oct 15, 2013 7:54 pm
Posts: 1929
Location: Darling Downs. Qld
There will always be a little moisture in the blowby gases. Don’t worry.

Tink


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 Post subject: Re: catch can
PostPosted: Thu May 17, 2018 3:57 pm 
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Joined: Sat Aug 01, 2015 4:37 pm
Posts: 6
Location: maitland nsw
Thanks Tink .


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 Post subject: Re: catch can
PostPosted: Thu May 17, 2018 3:58 pm 
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Joined: Sat Oct 12, 2013 5:36 pm
Posts: 1374
blinky
For every litre of petrol or diesel burnt in an internal combustion engine it creates approximately 1 litre of water in the combustion gas, ie, converts some of the hydrocarbon fuel into water when it is burnt with oxygen and H2O is created. Since it is in the combustion gas, some of which is called blowby as it passes the rings, the catch can will condense it.
If doing a lot of around town driving, the amount of water will be more than hot highway running of the same distance.
As tink said, it is normal. Always have a look at the engine oil on the dip stick to make sure there is no milky look to the oil which would indicate a possible leak of water into the oil. Pretty obvious if that is happening though.


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 Post subject: Re: catch can
PostPosted: Thu May 17, 2018 4:30 pm 
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Joined: Sat Aug 01, 2015 4:37 pm
Posts: 6
Location: maitland nsw
Thanks mydmax.


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 Post subject: Re: catch can
PostPosted: Sun Jul 08, 2018 1:53 pm 
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Joined: Sun Oct 13, 2013 6:51 pm
Posts: 774
Location: God's country
Here's what came out of my Provent catch can after 10,000km. A 75ml combination of water and oil.

Better it goes into this than my engine!

Image


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 Post subject: Re: catch can
PostPosted: Tue Jul 17, 2018 7:16 am 
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Joined: Sat Aug 01, 2015 4:37 pm
Posts: 6
Location: maitland nsw
Makes you wonder why a catch can isn't installed by the manufacturer.


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 Post subject: Re: catch can
PostPosted: Tue Jul 17, 2018 7:37 am 
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Joined: Sat Oct 12, 2013 5:36 pm
Posts: 1374
Oil coming out of the engine breather is lost to the sump anyway and if carbonizing of the oil in the intake manifold isn't a problem then the oil presents NO problem to the engine at all. In fact it lubes, to some degree, the intake valve stems and upper cylinder area where the rings have the least lube from direct sump oil from the oil mist in the sump.
Many people regard the oil as bad, it isn't, and until HOT EGR gasses making the oil mist entering the intake into GOO, there was never a problem.
Although things have changed in recent times, turbo diesel truck engines has ALL the blowby and it's oil running through the intercooler into the engine. Never a problem. Small turbo diesels pre EGR did the same, nil problems.
As for water in the mixture captured by a catch can, that is largely the result of short running, stop start cold start type useage. If it did all the kms with hot running, there would be practically no water in catch can contents, because all was hot all the time and no condensation of anything to accumulate and collect anywhwere.


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