Inline fuel filter for Crankcase filter?

[Adam R]

Now that I have pod filter, I'm thinking of using an extra inline fuel filter to filter the air going into the crank case.  Is there any issue with doing this that I should be aware of?



Thanks,

Adam

[JasonB]

buy a breather filter, thats what they are made for.

[galahs]

Hmmm, that seems like a really good idea.

I have had troubles getting a proper breather filter that will fit, but a $2 fuel filter would most likely do the job perfectly.

Probably have to change it every 10,000km's as it would clog over time with oil blow bye and debris, but for $2, big whoop!

[Wondertwin]

If you're on a ramen noodle budget, you can zip-tie a Red Bull can to the frame rail and route the hose into it.  Common streeetfighter mod, but you'll need $2 for a Red Bull if you don't like rooting through the trash...   Probably a longer section of hose as well.

However, you can get those breather filters at Autozone for $10, and I'd agree that's the best solution.

[werase643]

no need for a filter at all!!!!

pull that cover off of the valve cover
and you will see a big pile of SS steel wool...the filter...is in the engine
the hose is for positive crankcase venting...and it routes to the airbox to
burn the little bit of oil mist that might get past the filter

either route to a catch can....red bull is fine
or route a tube to rest on top of the air filter to suck any oil mist and burn it in the engine

unless you want bling factor that nobody can see.....

[galahs]

Not many autoshops here (South West Sydney) stock breather filters for such a small size hose.

I really think the fuel filter idea has some merit and I'll fit one today.

If there is a problem I'll remember to dig this thread up and report it.

[galahs]

Here is a picture of it mounted.




I put a longer section of 12mm fuel hose on so the filter would clear the lunch box air filter. If you wanted you could attach another piece of hose to the end of the filter and have it exit out the side of the bike (ie where the battery breather exits)

but I didn't.

Fit the filter so the flow direction marked on it points away from the engine.


So far so good 

[dgyver]

Another option is to cut a small hole in the lunchbox filter and add a fitting for the breather hose to attach.

[galahs]

Another option is to cut a small hole in the lunchbox filter and add a fitting for the breather hose to attach.

If you are emissions concious (and we all should be) that is a really good idea too 

[galahs]

Alrighty.

I returned from a long road trip (900km in one day!) and my bike had an oily mist from my breather hose (had an inline fuel filter on the end). The filter seemed to have become partially clogged too, so I wanted a new idea.

So I have decided to change my breather to feed a catch can.


I found a really small plastic orange juice bottle.

Drilled a hole in the lid that would fit a 10mm fuel hose.

Around the larger hole I drilled 20 smaller holes.

Inside the bottle I shoved a nylon orange netting bag to help condense the oil mist so it will collect in the bottle.



So the oily mist from the breather goes down the fuel hose into the bottle, the oil gathers on the netting and falls to the bottom of the bottle, the air pressure escapes out of the smaller holes drilled in the lid.

When I need to empty the bottle I can reach in between the frame, unscrew the top lid, clean out the bottles content, then screw it back on.

Easy peasy!

[sledge]

I am with kenny, I cant see a need for a filter. Its a vent to allow pressure to escape from the engine, not to enter. The racers use catch-cans and filters to stop oil drips getting on the track. If you put a filter in the vent line it will ultimately become clogged and restrict airflow out of the engine. This in turn will lead to an increase in crankcase pressure and the possibilty of a failed gasket or a blown oil-seal.

[galahs]

For those who are emission concious this may be a good option.

http://www.automotiveforums.com/vbulletin/showthread.php?t=469918

[galahs]

Today I replaced the nylon orange bag in my catch can (bottle) with some 60 cent stainless steel pot scourer.

(you include a mess object like this to increase the surface area so the misty oil gathers on the surface of the scourer and drips to the bottom of the bottle)

[scottpA_GS]

PIC's 

We need Pictures!

[ben2go]

If you position this contraption right the oil will drain back into the valve cover.
You will still need a filter.When the engine is cranking it has a tendency to suck air in.
Ask me how I know.

[CndnMax]

how do you know 

[ben2go]

how do you know 

I destroyed a dirt bike engine that way.Small particles (dirt) got in there an scored up the cylinder walls and piston.

[CndnMax]

aww thats not good 

[galahs]

PIC's 

We need Pictures!

I was waiting for that.

If I bothered to take a photo when I had my tank off you could have easily seen it.

now I can only take a photo through the frame.

[crispy5]

Another option is to cut a small hole in the lunchbox filter and add a fitting for the breather hose to attach.

If you are emissions concious (and we all should be) that is a really good idea too 

Has anyone actually done this?  Just curious since I'll be putting on a lunchbox soon.