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Motorcycle crankcase breather tanks.

Agemax

Agemax

Forum Guru
these have been discussed on the site before, some like them some don't, some think they are a good idea, some think they are a waste of time.

either way, you look for them on ebay or wherever and all you seem to find is car orientated tanks which are far to big for motorcycles.

so, i decided to design a motorcycle specific tank.small, but with a 200Ml capacity they are plenty enough for most engines,(unless you have serious engine problems.
they come in 2 variations, upright or horizontal,

100_1498_zps17b73b24.jpg


they have built in level sight glasses or the upright one can have an external level sight tube. there is a built in vent at the top and a drain at the bottom.
any amount of inlet fittings can be added (within reason)
mounting is easy, big jubilee clips, zip ties or make a decent bracket and pop rivet it on(see white one).
they are metal so can be painted,powder coated or chromed, which would look fab :)

100_1499_zps90bc0a19.jpg


drain valves are schrader valves with the guts ripped out so you can add extensions,angled adapters or flexi adapters to allow for easy draining.

what does everyone think?
 
Last edited:
John Kat said:
Looks great to me!
What would the dimensions be?
I suppose you need to add a breather kind of filter?
Click to expand...

they are 54mm diameter and approximately 120mm in length, they have a built in breather filter on the top but it can be replaced by a tube if you wish to fit a small k&n style filter on the top instead
 
Interesting and good looking project. Good luck with the marketing.

My '80 Honda XL had one from the factory. Not near as nice as what you have put together.
 
You might laugh, but I have a Coke bottle with a part of a rag and a big hole cut in it for breather filter. Been running it for 6 months or so and to my surprise the filter isnt even wet, some day I will buy a proper filter for it:cool:
 
gearhead13 said:
You might laugh, but I have a Coke bottle with a part of a rag and a big hole cut in it for breather filter. Been running it for 6 months or so and to my surprise the filter isnt even wet, some day I will buy a proper filter for it:cool:
Click to expand...

the filter should not get wet, if it does you are in BIG trouble. the filter is there to allow fumes and and pressure build up to escape.
the bottle is there to collect any moisture/fluid then gets blown out the engine
 
Adrian...I am not familiar with "ML" size..is this basically the size of a soup can I am guessing?
 
The reason I ask is this.

If you look at part 24 this is the breather hose for the TX I have. There are no fittings on the airbox for recycle like our GSs do.

So as a consiquence, it basically open vents right above the front flat area of the swing arm and oil splatters back onto the pipes. There seems to be some kind of plastic nipple broke off in the end but i can find any pics showing a vapor catch tank. This may be my fix for stopping the mess!!


http://www.bikebandit.com/houseofmotorcycles/1973-yamaha-tx750/o/m7788#sch219116
 
chuck hahn said:
The reason I ask is this.

If you look at part 24 this is the breather hose for the TX I have. There are no fittings on the airbox for recycle like our GSs do.

So as a consiquence, it basically open vents right above the front flat area of the swing arm and oil splatters back onto the pipes. There seems to be some kind of plastic nipple broke off in the end but i can find any pics showing a vapor catch tank. This may be my fix for stopping the mess!!


http://www.bikebandit.com/houseofmotorcycles/1973-yamaha-tx750/o/m7788#sch219116
Click to expand...

this is the exact reason these tanks are designed for Chuck, catch any fluid but vent any fumes or pressure build up.

All GS's have them as stock, it called the air box! ;)
 
As such that I stated...but what about the Yamaha TX? Why would there seem to be a broken plastic nipple in the end of the tube, but yet there isnt any catch tank in any of the fiches? This is what is perplexing me.

I will need a catch tank of some sort and your pictures have sparked some ideas.
 
I also should add that there are no obvious mounts or brackets that would suggest there was an OEM mounting for any catch tank.
 
chuck hahn said:
I also should add that there are no obvious mounts or brackets that would suggest there was an OEM mounting for any catch tank.
Click to expand...

are you sure it shouldn't go to a fitting maybe in the swingarm or frame maybe?
my only other guess is that the pipe is from a different bike, with the broken part still in the tube???????
 
Adrain...look at the fiche I posted...its the OEM tube...but where does it go at the open end is the mystery. And as i stated earlier, there is NOT a nipple on the airbox for recycle of the vapor/ oil droplets.
 
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chuck hahn said:
Adrain...look at the fiche I posted...its the OEM tube...but where does it go at the open end is the mystery. And as i stated eralier, there is NOT a nipple on the airbox for recycle of the vapor/ oil droplets.
Click to expand...

yes i have looked. i only asked because i dont know if it is the OEM tube you have fitted or just any old pipe off another bike.
i know you said there is no nipple on the airbox........what about the oil tank?

i dont know because i know nothing about this bike!!!!!!
 
There is a vent tube...which has nothing to do with the crankcase breather system. I also had sent an email to a bloke in the UK that he and his wife ride these..still awaiting a response.

The tube that comes off the breather also has a much larger ID than the little one off the oil tank itself...very confusing for sure.


Based on the fiches depiction and what i have in hand..i would say it is the OEM pipe ..right down to the very same spring around it.
 
I have added that to my FAVS for reference later. So it would seem I need a nipple and some modification to my airbox ( which has no such modification as pictured ) and revent the tube back to the airbox.


May add an inline filter as well to grab any globs of oil in the pipe. You sir may have solved the quandry!!!
 
chuck hahn said:
I have added that to my FAVS for reference later. So it would seem I need a nipple and some modification to my airbox ( which has no such modification as pictured ) and revent the tube back to the airbox.


May add an inline filter as well to grab any globs of oil in the pipe. You sir may have solved the quandry!!!
Click to expand...
:clap: :clap: :clap:
it would be very easy to fab up a small nipple as you call it to fit the pipe onto, or simply just drill a hole in the airbox and silicone the pipe in there
 
I gota refit the airbox into the frame once we get the engine back in and do some measuring..but you have set the path for sure.
 
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