Author Topic: automating the air filter water drain pipe  (Read 480 times)

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Offline MohKraats

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automating the air filter water drain pipe
on: 03 May, 2021, 07:01:37 PM
Hello Biffers,

As I was attended by Art at the condensation water drain on my CBF

I noticed that the water drain pipe on the air filter can fill up quite quickly. :005:
Well, mostly since I am lazy,
but also because it can fill up in just a couple of days and I don`t want to empty the pipe every couple of days,
I have modified the pipe so it drains itself.

So, what we want:
- Keep dirty air from comming into the air filter housing
- Get rid of water from the air filter housing

I did take the original pipe, and drilled a small hole in there (3mm), say, made it leak.
Hole could be smaller too, I just happened to make it 3mm
Just the location of the hole is critical for the second part.

So that gets rid of the water.
Now keep the dirty air from getting in.

I took a piece of 1mm NBR sheet that I happened to have laying around.
Cut a small piece out of that, and tied it to the pipe with a tiewrap.
Done this in such a way, that the NBR sheet rests on the hole.
The location of the hole makes the NBR close the hole from itself.

When now the engine is running, the slight vacuum in the air filter housing will suck the NBR against the hole and keep it shut.
After the engine is shut down, the NDR is released, and remains just loose against the hole.
Any water will just seep out through between hole and NBR-

The thing could also be done with for example a piece of inner tube,
but that might not hold so long in the outside air, and would need replacement every couple of months ???
I don`t know how long the NBR is going to hold, but since many oil seals are also made out of NBR, I recon it will hold for quite a while.

Greez,

Moh
Last Edit: 03 May, 2021, 07:03:20 PM by MohKraats

#1

Offline Art

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Re: automating the air filter water drain pipe
Reply #1 on: 04 May, 2021, 04:59:12 AM
Mines never been a problem, I look at it when carrying out drive chain maintenance and it rarely has any water in it. It gets removed as part of my 4,000 mile interim service schedule for cleaning by way of a goodly spray of brake cleaner and a spin of a cotton bud. Its a topic that crops up now and again, the one that comes to mind is the forumite who came up with the solution of cutting the end of the pipe off and then took the time to recommend that as good practice.

Some folk shouldn't be allowed spanners :087:

#2

Offline iNCORRIGIBLE

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Re: automating the air filter water drain pipe
Reply #2 on: 04 May, 2021, 08:44:24 AM
Where do you suspect all this water is coming from  :027:
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#3

Offline MohKraats

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Re: automating the air filter water drain pipe
Reply #3 on: 04 May, 2021, 10:03:14 AM
Hello Incorrigible,

Well, could be from either,
Most common:
- Condensation from moist air cooling down.
After a ride, when the bike is still wam, but the air is moist, you park the bike, and everything cools down,
the air inside the filter housing will also cool down, and will get below dew point, causing dew (condens) on the inside of the filter housing.
The level of such condensation depends on the weather conditions.
This cannot be avoided. hence the water drain pipe.
If there is only little water in the drain pipe, that water will evaporate again when riding the bike.
It is wise to regularly check that pipe for water, and empty it when full.


Problems:
- Coulant leackage into the engine oil, giving water into the air filter housing through the Breather from the engine to the filter housing.
  Although in such case, the oil will have grey-isch slutch on top.
- Water from rain or spray leacking into the filter housing.
  This should happen only if there is a leak in the housing, or in case for instance when someone puts the water hose at the bike the wrong way around when trying to clean it.

Greez,
Moh

#4

Offline MohKraats

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Re: automating the air filter water drain pipe
Reply #4 on: 04 May, 2021, 10:50:41 AM
*Originally Posted by Art [+]
Mines never been a problem, I look at it when carrying out drive chain maintenance and it rarely has any water in it. It gets removed as part of my 4,000 mile interim service schedule for cleaning by way of a goodly spray of brake cleaner and a spin of a cotton bud. Its a topic that crops up now and again, the one that comes to mind is the forumite who came up with the solution of cutting the end of the pipe off and then took the time to recommend that as good practice.

Some folk shouldn't be allowed spanners :087:

Still, Art, don't take them their spanners away.
Them people are good for keeping up bike sales figures. :046:

Greez,
Moh
Last Edit: 04 May, 2021, 10:51:16 AM by MohKraats

#5

Offline jm2

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Re: automating the air filter water drain pipe
Reply #5 on: 04 May, 2021, 04:57:35 PM
Mine too is mostly clear each time I've checked it - my last note mentions it was bone dry.
I do remove it, and likewise use carb/brake cleaner to sort any/most of the oil stains.
My last two bikes have had the same arrangement and whilst FSH doesn't get them clean (I think I know why!), I do (at least dry).

I do wonder which canal you've been riding in or perhaps you are fruity with the jet wash; that isn't 'normal'.

You need to determine if it is mostly oil or water - not cutting ends off to make draining easier (that is the sympthom not the cause).
If it is oil I wonder if your pair valves are in need of a de-choke, if water I'd be checking your airbox isn't split somewhere.
 
Only do it right - no bodging please.   Keeper of the failed stator list.   John.

#6

Offline MohKraats

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Re: automating the air filter water drain pipe
Reply #6 on: 04 May, 2021, 05:04:02 PM
Hello Jm2,

Its water in there.
So looks like mainly condensation.
Well, it isn't quite dry here in The Netherlands.
However, it struck me too like being quite a lot of moist collecting there.

Greez,
Moh

#7

Offline Art

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Re: automating the air filter water drain pipe
Reply #7 on: 04 May, 2021, 06:10:52 PM
*Originally Posted by jm2 [+]

I do wonder which canal you've been riding in...

Me and the (used and abused) Bonne' do Sandon Brook at Little Baddow in Essex




#8

Offline iNCORRIGIBLE

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Re: automating the air filter water drain pipe
Reply #8 on: 04 May, 2021, 06:57:16 PM
Get the impression from other contributors that the level of water you are encountering in your air filter enclosure  drain is far from normal. I think you are also experiencing what you feel is extended cranking/start up  times. Looks like a possible link between the two phenomena. If the bike is trying to start normally with water saturated air it is pretty well bound to complain. Establishing the causes of such an apparently high level of water in the drain seems to be a reasonable approach Ed.
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Offline MohKraats

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Re: automating the air filter water drain pipe
Reply #9 on: 04 May, 2021, 07:47:41 PM
*Originally Posted by iNCORRIGIBLE [+]
Get the impression from other contributors that the level of water you are encountering in your air filter enclosure  drain is far from normal. I think you are also experiencing what you feel is extended cranking/start up  times. Looks like a possible link between the two phenomena. If the bike is trying to start normally with water saturated air it is pretty well bound to complain. Establishing the causes of such an apparently high level of water in the drain seems to be a reasonable approach Ed.

Yep, one would think so,
However, the bike starts normal after first giving it a very short start pulse.
That should not be possible if moist would be the reason.

Might I be the owner of a bike with multiple issues  ??

Greez,
Moh