Online: B0nes, FBUser19, Smokey61

Catch Cans

  • Jersey
    Jersey
    1 month
    Hey All,
    Pulled Air cleaner off the other day and said that's enough.  Black and shitty throttle body.  Also sick of oil dripping from Air Cleaner.  Fucken EPA.  Did a bit of Interweb searching and found quite a few photos of Carbon Buildup on pistons from recirculating crankcase gasses and how the resulting carbon buildup can change tunes and damage engine. 
    Modified a fuel filter and turned it into a Catch Can.  Took about an hour and the best $12 I ever spent.  I was really surprised to see how much condensation coming from motor as well.  I ride it at least twice a week and if not will just start it and get it hot.  Still heaps water vapour coming out.
    I reckon the easiest and cheapest way to improve Twin Cams and M8s.  Some dudes are quoting a couple extra HP as well once you get rid of the Hot Air and Oil going back thru intake.
    Jersey
     
  • steelo
    steelo
    1 month
    Are you sure?
    Post pics.
  • Jersey
    Jersey
    1 month
    Hi Steelo 
    I'm not usually sure of anything.
    What are you asking Sure of what ?  Condensation?  
    Yes.  Running a see thru hose and catch can and seeing more water vapor than I would have expected.  Hose is about 450mm long and vapor seen all the way into the the clear catch can.  Only about 50kms on it now and starting to see milky fluid coming thru at the top that normally would have gone to the throttle body.
    Jersey
  • binnsy
    binnsy
    1 month
    Be interested to see this set up you made 
  • fatbat
    fatbat
    1 month
    I know the external breathing can be put together with a few parts but if anybody wants an easy solution go to DK Custom website in USA. Sell a few versions for this. Def a good thing
  • Jersey
    Jersey
    1 month
    Hey Fatbat
    If my bike was newer I would have gone with the DK Catch Can.  Nicely machined billet and sell as a kit.  They have heaps videos on You Tube.  I looked at it and said I could make a cheap version today.  Bought a $4.99 Plastic Fuel filter at Supercheap and a couple 6mm 90 degree elbows and a 6mm tee from Bunnings.  Had 6mm hose in the garage which I will prolly change to Stainless Braid down the road.  I cut the tank end of the filter off and plugged it with a screw and some silicone.  Then drilled about 10 1/16" holes in the top.  Painted the top black and stuffed it back behind my starter.  Hard to notice unless your looking.  I'll just throw the filter out once a year.  This was easy on my bike but will be much harder on others with stock air cleaners or air cleaners with the stock breather bolts and spacers attaching straight to the heads.  My air cleaner eliminated the original breather bolts and spacers and ran hose into the back. They supplied new breather bolts that a tube or hose is easily attached to.  it also has just enough room for a 90 elbow to send the blowby down behind the Air Cleaner.  I know the spacers and bolts added structure and stability to the intake but this cleaner is half the weight of a stock one and has been good for last 6 years.  It is pretty solid.  Fingers crossed.  Some of the kits out there will require drilling and tapping to install but will maintain the structural rigidity of the OEM Air Cleaner and throttle body that HD intended.  My S5 phone is so Old I could not  download any photos tonight but will try again later.

    And your right No matter how you do it and there a bunch of ways, it is definitely a good thing. 
    Jersey

  • Jersey
    Jersey
    1 month
    Quoting steelo on 29 Aug 2021 10:23 AM

    Are you sure?
    Post pics.

    Will try again to get some photos later or tomorrow Steelo.
    Technology not my specialty.  Fucken old phone shuts off every time I turn camera on. 
    It is nothing special or hard, but glad I did it.  It will be much harder for dudes with Stock Air Cleaners or Aftermarket with Head to Air cleaner spacer bolts.  Plenty of kits out there.
    Jersey
  • paulybronco
    paulybronco
    1 month
    I was very naughty to the dolphins and vented mine to the atmosphere. Works a treat
  • Jersey
    Jersey
    1 month
    LOL
    All my Shovels did that and my sporty would would spew a couple ounces oil out on ground.
    Never thought anything of it back then.
    Part of owning a Harley
    Jersey 
  • fatbat
    fatbat
    1 month
    Good stuff Jersey, sounds like your home made one does the trick nicely. Thanks for the write up too as I might follow your recipe 
  • Krash Kinkade
    Krash Kinkade
    1 month
    have always just vented to the air.
    the old Harleys Shovels so on, vented from the cases, the newer one's twin cams sporty's, vent from the heads. if you don't ride a lot & the oil migrates from oil tank to crank case ( while bike standing a while ). when you start them, can get some oil come out the vent. Or if there is a lot of blow by in cylinders, can get some oil come out at higher rev's. but in general not bad. plus this does not need a filter, as it's breathing out, not sucking in. The problem with putting a small filter at end of the  hose is, as any oil builds up in the small filter, the filter works like a spray gun, putting a fine mist of oil over everything around it. I've just got my sporty vented to the air & no problems no pools of oil or anything.
    but Some Harley's can have a problem, like if crank case fill's with oil, while bike stands for a long time. when you fire it up. the pressure of pistons going up and down & full case of oil. no where for all the pressure build up in crank case to go. so it will throw oil out the breather hose. Happens more with Big motor's & the models that breath from the case.
    But it does not indicate a problem, just something that can happen, if bike stands a long time.

  • Jersey
    Jersey
    1 month
    Some pictures of the setup.
    May not be for everyone but it works!
    Will change out the Blue Hose to braded Stainless once it gets black and ugly.
    Jersey

  • Jersey
    Jersey
    1 month
    Quoting Krash Kinkade on 30 Aug 2021 11:49 PM

    have always just vented to the air.

    the old Harleys Shovels so on, vented from the cases, the newer one's twin cams sporty's, vent from the heads. if you don't ride a lot & the oil migrates from oil tank to crank case ( while bike standing a while ). when you start them, can get some oil come out the vent. Or if there is a lot of blow by in cylinders, can get some oil come out at higher rev's. but in general not bad. plus this does not need a filter, as it's breathing out, not sucking in. The problem with putting a small filter at end of the  hose is, as any oil builds up in the small filter, the filter works like a spray gun, putting a fine mist of oil over everything around it. I've just got my sporty vented to the air & no problems no pools of oil or anything.
    but Some Harley's can have a problem, like if crank case fill's with oil, while bike stands for a long time. when you fire it up. the pressure of pistons going up and down & full case of oil. no where for all the pressure build up in crank case to go. so it will throw oil out the breather hose. Happens more with Big motor's & the models that breath from the case.
    But it does not indicate a problem, just something that can happen, if bike stands a long time.

    Hi Krash
    With the way this is set up the oil mist will get trapped by the filter paper as it enters from the top side of the filter.  Vapor goes in thru the top into the filter paper pocket; breathes thru the paper and out thru the vent holes on the outside of the filter pocket.  You can just see condensation on the walls of the filter housing in the photos.  It passes thru but the paper should trap the oil.  Since this is the first go I didn't paint the whole filter black so I could see how it looks inside after a couple thousand KMs.  Once I get an idea how long it will last I will just change it once every 6 months or once a year whatever.  It is literally a 5 minute mod to the filter and 1 minute to change it.  $5 at Supercheap.
    Like I said previously Not for everyone but I am a Cheap Ass and once tucked away you can barely see it.  I would rather spend the $200 for a proper kit on something else.
    Jersey


  • Baloffski
    Baloffski
    1 month
    Quoting Jersey on 01 Sep 2021 02:26 AM

    Some pictures of the setup.

    May not be for everyone but it works!
    Will change out the Blue Hose to braded Stainless once it gets black and ugly.
    Jersey

    Dumb fucks  like me..
    need pictures. TA

  • Hoodeng
    Hoodeng
    1 month
    No can required. That is the discharge hose to the left of the muffler photo.

    Cheers.
  • Jersey
    Jersey
    1 month
    Hi Hoodeng
    Can you post where you got your Bolt and Banjo kit that go into the head?  The Mikuni brackets as well.
    Might help others who do not want to buy a kit that takes drilling and tapping.
    I might buy a kit myself as it is better than my Jerry rigged job.  I really like the brackets to.  Would be good to get the Air Filter braced up to the head again as well.
    Thanks Man
    Jersey
  • Hoodeng
    Hoodeng
    1 month
    Mikuni parts come from 'T D Hatrick' in QLD, S&S parts can be obtained by pretty much every bike shop you care to deal with.

    Cheers.
  • Grease Monkey
    Grease Monkey
    1 month
    Mines all downhill and no drips on the floor, touch wood.
  • Soapbox2627
    Soapbox2627
    15 days ago
    just browsing the supercheap auto catch can $68
    plus hoses about $100

    if that's what you are looking for
  • tussuck
    tussuck
    15 days ago
    I have one for sale if anyone wants one.