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Water in oil (V7 II)

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motopete View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote motopete Quote  Post ReplyReply Direct Link To This Post Posted: 24 Aug 2018 at 17:02
Doh!  Funny how typo's can stare you in the face...Clown

Getting a photo on the bike's a bit tricky but I've attached a pic of my "collector tube" gadget (nothing more than standard plumbing fittings, sprayed black).

The contraption is (for now) tie wrapped to the LHS lower frame rail under the starter.
The oil separator pipe feeds into 'INLET'.
The one-way valve is still connected to the sump, but it's plugged to prevent any leak back.

Nothing comes out the 'VENT' port, so I assume the oil separator is vented OK by the airbox breather. Certainly the airbox breather inlet seems clear if I blow though it.

 I undo the drain every week or 2, usually collecting a dribble of water or water/oil emulsion.
If my sump level's at max it does collect a bit more oil, but that stops once the sump's down to about 3/4 max (where I normally run it).




HTH, Pete
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jefrs View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jefrs Quote  Post ReplyReply Direct Link To This Post Posted: 27 Aug 2018 at 11:29
Originally posted by Dave P. Dave P. wrote:

Cold damp weather & short rides often add up to water in the oil.RE Bullets are renowned for it.The "Mayonnaise" subject has appeared often on the Hitchcock's forum.The only time my bullet is totally mayo-free is when riding in Southern Europe in the summer.
  

The Enfield EFI engine has a peculiar system of weirs and dams inside the engine and a very high pump rate of oil. It has an oil catch pot and return inside the engine case so the breather is just a pipe to the airbox.  The older Enfield engines are more prone to breather problems and can have some real Heath Robinson solutions.

This is perhaps not the place to discuss the Enfield predilection for making mayonnaise but it has been done to death on the REOC/Hitchcocks forum, and may shed some light on the italian mayo.

The main source of water in the engine is as water vapour drawn in through the breather with air. Air has to go in and out otherwise we'd get a vacuum inside the case.
The breather must be allowed to eject water vapour, trapping it and draining it back into the engine as liquid is not a good plan.
Detergents in the oil will trap and emulsify water, that is its job and difficult to boil out once it has formed; this is the mayonnaise.
The oil must be allowed to get hot enough to vaporise water condensation. The V7.ii has a pair of 75kW knee warmers to adequately do the job even in the coldest weather. The engine produces about 50hp as mechanical work but wastes the rest, about 80%, as heat, 150kW waste as heat. That's a lot of heat, kitchen ovens run to about 5kW.
So running the bike up at idle 'in winter' is not a good idea, it needs a good run.

I ride the bikes all year, true not as much in winter, but I don't get mayo. We often get very good riding days in winter, bright and sunny if a bit nippy.
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Adam View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Adam Quote  Post ReplyReply Direct Link To This Post Posted: 27 Aug 2018 at 18:42
My trials bike gearbox oil can turn milky grey with condensation within one day if there's streams on the course. Especially in winter with a hot engine being plunged into icey water, I'm surprised it doesn't shatter. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jefrs Quote  Post ReplyReply Direct Link To This Post Posted: 27 Aug 2018 at 23:25
I used to marshal trials. They seemed to spend more time immersed in the water than out of it. I remember one competitor come up saying, "I've lost my bike", he'd dropped it in a pond and couldn't find it.
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