nothing fancy, homemade air-cleaner

Discussion in 'General Questions' started by gone_fishin, Feb 3, 2007.

Tags: Add Tags
  1. gone_fishin

    gone_fishin Guest

    amazing what you can do with a coupla beers & some screening :lol:

  2. srdavo

    srdavo Active Member

    too cool bro! I like it!! :D
  3. Wheels

    Wheels Guest

    That is tight, is there some sort of filter element also? I can see your frame clearance is pretty tight for this but would a velocity stack help performance on the chinese engine?[​IMG][​IMG]
  4. gone_fishin

    gone_fishin Guest

    right now it's uses the original foam element...i used some nuts (inside) as spacers so it didn't flatten...the design will hold a much thicker one soon as i find the right piece of foam.

    i have plenty of clearance, i guess a velocity stack would work, but it would have to be offset to match the below-center inlet on the carb-body, no?
  5. Wheels

    Wheels Guest

    Yep, I am going to have to get an engine, is that the stock carb augie?

  6. Tom

    Tom Active Member

    hahahahaha that is so sweet! Love how you made it out of beer can. of all things...
  7. gone_fishin

    gone_fishin Guest

    :lol: srdavo was saying in chat how R & D is always the best part of the job... :lol:

    wheels, yes it's a standard dax 70 kit.
  8. cyclemotors

    cyclemotors Guest

    Even doin your bit for the enviroment by recycling too, excellent...
  9. foyeburger

    foyeburger Guest

    whoa thats cool looks like it would be good for those over sized carbs give yah more space who says drinking doesnt fire up your imagination hahahaha !!!!!!
  10. gone_fishin

    gone_fishin Guest

    hmmm...maybe i could sell 'em :wink:

    anyone interested, i'd only charge ya cost of "materials" :evil:
  11. bird

    bird Guest

    those things are sweet where did u find them
  12. chieflets

    chieflets Guest

    the point of a velocity stack isto allow a K&N filter on there but the problem we face is room from the carby to the seat bar......

    yes the 20mm new plastic box is restricting to airflow being sucked in old style was better but new plastic box is better in the wet cause you filter don't get wet

  13. Wheels

    Wheels Guest

  14. D.J.

    D.J. Guest

  15. gone_fishin

    gone_fishin Guest

    wow, d.j., that's a neat selection of similar airboxes 8)
  16. chieflets

    chieflets Guest

    Yeah man,

    I never saw that post before on there site all these pics back date to 2005 hmm how did i miss it ...........maybe cause I didn't search that far back when setting my options.

    good to see few varities this is what i love other people idea's and sharing photo's

    i luv augie's one out of beer that unique and the capacino cup one

  17. srdavo

    srdavo Active Member

    davidsis' Bud air filter

  18. Great use of an empty....hmmmm..anyone have any other beer can applications for the HT? Maybe we could make a case for a beer sponsorship....
  19. fastboy9

    fastboy9 Member

    I made one of these out of pepsi cans (as im too young to buy beer :cry:).
    I made a motorized bike for a college engineering project, so I had to write a lot of information about each and every bit, also made this diagram of the can air filter. Might be of use if you want to make one.

    Attached Files:

  20. fastboy9

    fastboy9 Member

    Making your own home made air filter

    The stock air filters on the Happy time carbs dont allow much air to flow. If you are after performance then this is one of the most basic modifications. There are several different materials you could use as the filter element. Each has its different advantages, depending on where you ride depends on what level of filtration you need.

    The main two types of filter elements:

    Pleated paper filter elements are very commonly used for engine air cleaners, because they are very cost efficient and can easily be replaced. Once they clog up you can just throw it away and replace it with a new sheet.

    Polyurethane foam elements are used in some aftermarket replacement off road air filters. By adding a little bit of oil to the foam it is possible to enhance the dirt collecting properties of the filter. Foam is especially suited to catching large particles such as dust and sand; it also allows very unrestricted air flow. A disadvantage is that it isn't very good at stopping small particles of pollution.

    If you want enhanced filtration with out effecting air flow much, then a thin nylon mesh material, like womens tights can be used as a screen on top of the sponge element.

    The next thing you need to think about is how the filter is going to be housed. The filter needs to be protected from heat, and also needs to be in a sturdy housing because the carburettor vibrates a lot from the engine.

    There are many different shapes you could use when designing the housing, but compactness is usually a priority.

    This cylinder air filter is designed to take up very little space. There are cone shaped varieties and other dome shapes too. (A coke can or beer can can be perfectly modified for this shape.)

    This shape is ideal for a car but where space is limited isn't really suitable. It has the advantage of having a high flow of air 'rammed' into the intake because the panel is facing the oncoming air flow as the bike is moving.

    This is similar to the existing Air filter, it is made for a Chainsaw engine. It has. A low air flow rate because
    of the small air intake holes.

    A velocity stack is a generally cylindrical tube with a radiused inlet end device, (looks like a horn shape). Which is used between the air filter and the carb intake. It is designed to:

    1. Allow smooth and even entry of air into the intake duct with the flow stream adhering to the boundary layer that adheres the pipe walls.

    2. Modify the dynamic tuning range of the intake tract by functioning as a small reverse megaphone which can extend the duration of pulses within the tract.

    3. Alter the dynamic tuning speed (dynamic engine compression) if it includes longer or shorter lengths thereby changing the tuned length to a lower or higher rpm.

    Basically the shape of the stack speeds up and smooths the airflow as it enters the carburettor, a perfectly tuned velocity stack can increase the horsepower of the engine.

    This is my home made air filter, it is made from a coke can and filled with a slightly less porous sponge element to the stock air filter, but has much more holes in it to increase air flow, I have put some oil on the sponge, and used a screen made from a pair of tights! Works great, and you get a great sense of satisfaction too. I cut the original air filter box to give me a mounting plate to the inlet on the carb, this was then bolted to the can which fits almost perfectly. The concave indent at the bottom of the can was popped out by using a hammer carefully, this left me with a dome shape on top of the can.
    First I drilled out the holes where the screws would go through to hold the filter in place to the inlet, then drilled a further ten holes in the dome for air flow.

    Give it a go, its not difficult, and its not hard to make an improvement on the existing filter. Make sure you post some pics of your DIY filters to inspire others. Hope this all helps! ;)
    Last edited by a moderator: Dec 15, 2015