Author Topic: Air Filter Oil  (Read 3376 times)

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MetalHead550

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Air Filter Oil
« on: May 04, 2005, 02:08:05 PM »
My Uni air filter came in today but I forgot to get oil for it.  Any one know if its ok to use K&N filter oil on it.  Is it basically the same stuff as Uni oil or will it not work on the foam?

Offline cb650

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Re: Air Filter Oil
« Reply #1 on: May 04, 2005, 02:55:05 PM »
Thats what I use.  Imagine any oil is ok if you clean it more than I do.



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18 grand and 18 miles dont make you a biker

Offline Einyodeler

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Re: Air Filter Oil
« Reply #2 on: May 04, 2005, 03:04:17 PM »
Uni,K&N or any foam filter oil will work,I use the PJ1 in a spray can on my UNI`s.It`s best to use filter oil because it`s alot stickier than regular oil which dries out faster and gets pulled off the filter easier.
1972 CB500 - 1973 CB500 - 1974 CB550K - 1975 CB550F - 1975 CB750F - 1976 CJ360 - 1983 CR480 - 1970 BSA A65T Thunderbolt



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MetalHead550

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Re: Air Filter Oil
« Reply #3 on: May 04, 2005, 05:22:07 PM »
Cool.  I'd like to know what makes air filter oil so speacial as apposed to other spray lubricants, other than the fact it comes out all colorful so you know where you sprayed it.  Obviously Uni's gonna say "only use Uni filter oil for Uni filters" and K&N will say to use theirs for their products for profit.  I have to say I'm not real impressed by the quality of this Uni filter.  Maybe it'll work great but its like..."I paid $26 bucks for a peice of plastic with some foam glued to it?"  Hell I could make somethin like this! 

Offline mgilvary

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Re: Air Filter Oil
« Reply #4 on: May 04, 2005, 06:01:23 PM »
I should probably know this already, but seeing as I don't...

Do pod filters require oil?

rob

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Re: Air Filter Oil
« Reply #5 on: May 04, 2005, 06:12:00 PM »
I am a little confused here..  your air filter needs oil?  I took the air filter off my CB650C, and just blew it out, as it had some debris in it.. is it necessary to oil it?

Rob

stanghater

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Re: Air Filter Oil
« Reply #6 on: May 04, 2005, 07:40:01 PM »
speaking of filters, i put a air filter in my bike and it ran like crap. i wonder why? anyone know, i was just running with no filter. i am just thinking about clamping a piece of filter foam on the intake for the airbox :-\

Offline Bob Wessner

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Re: Air Filter Oil
« Reply #7 on: May 04, 2005, 07:58:22 PM »
Rob,

There are two types of filters. The originals were paper and you cleaned them as you described. There are after market filters that use a gauze material that is impregnated with oil. The oil catches and holds the floating crud. They need periodic cleaning to remove the old oil and crud and then have to be re-oiled with filter oil that is more tacky than just plain oil.
We'll all be someone else's PO some day.

Offline Einyodeler

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Re: Air Filter Oil
« Reply #8 on: May 04, 2005, 08:14:18 PM »
speaking of filters, i put a air filter in my bike and it ran like crap. i wonder why? anyone know, i was just running with no filter. i am just thinking about clamping a piece of filter foam on the intake for the airbox :-\

Sounds like somebody set the carbs for no filter and it`s running too rich.Get a good air filter and set the carbs right,your motor`s worth it.
1972 CB500 - 1973 CB500 - 1974 CB550K - 1975 CB550F - 1975 CB750F - 1976 CJ360 - 1983 CR480 - 1970 BSA A65T Thunderbolt



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Offline Warlock

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Re: Air Filter Oil
« Reply #9 on: May 04, 2005, 08:57:14 PM »
Greets,
Taking the subject further, there are some considerations when using oiled filter elements. The two most common filter materials are gauze(woven) and foam(cellular). The structural differences of the materials dictate the characteristics of the oil to be used. The woven material has a thinner, denser media for the air to flow through. In this case, porosity of the media is very small and a lighter oil should be used. In this way, the oil is only viscous enough to adhere to the strands of the filter media without effectively reducing the size of the air passages through the media. The woven type of media has natural small particle filtering abilities due to it's design, so the addition of a light oil to the element enhances this natural filtering. Using a heavier or tackier oil in this design can actually impair the air flow efficiency of the filter by clogging the microscopic pores of the media. By comparison, foam elements do not have the natural small particle filtering abilities because of their extremely large porosity. These filters are usually thicker as they must rely on longer contact with the incoming air to filter efficiently. For this type of media, a heavier or tackier oil should be used. This is required because the spaces that the air flows through are much larger than woven media and the oil is the primary filtering agent rather than the media. The foam merely presents a tortuous air flow path to allow a greater time for the incoming air to be in contact with the filtering oil. When using oils other than the manufacturer's, it would be prudent to compare the viscosity and tackiness in making a decision. The manufacturer's recommended oil most likely has been engineered to balance air filtering and air flow characteristics. When using different brands, look for characteristics close to that of the recommended oil........
Ride On...

Offline Dennis

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Re: Air Filter Oil
« Reply #10 on: May 04, 2005, 09:41:32 PM »
I have  a '75 Honda Elsinore MT250 which came with a foam filter as standard equipment. Honda recommended oil for the filter in the day was gear oil. I guess that fits the heavier or tackier description.

stanghater

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Re: Air Filter Oil
« Reply #11 on: May 04, 2005, 11:43:22 PM »

Sounds like somebody set the carbs for no filter and it`s running too rich.Get a good air filter and set the carbs right,your motor`s worth it.
how is this done? is there a right up somewhere?

MetalHead550

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Re: Air Filter Oil
« Reply #12 on: May 05, 2005, 06:10:33 PM »
Hey, great stuff Warlock! Just what I needed to know.  Guess I'll be getting some Uni filter oil then.  I guess I'm just so used to gimmics and every company saying their stuff is the best that it all just starts to sound like BS after a while.

Hey Stanghater,  check out the Carb. FAQ and grab a good manual for your 650 and read the crap out of it.  You will be adjusting the mixture screw, though I couldnt tell you where it is on your particular carbs.  Its usually a slotted screw (for a standard screw driver).  There will be one on each carb and adjusting them at idle will determine the fuel mixture, to a degree.  Einyodelers right though.  The previous owner probably was running without the air filter, then riched up the carbs to compensate.  Their philosophy was probably that this would give the bike more power, like putting on K&N pod filters.  Doesnt work like that.  Youre definitly gonna want an air filter of some kind!

stanghater

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Re: Air Filter Oil
« Reply #13 on: May 06, 2005, 09:46:17 AM »
i was thinking about leaving the carbs set up the way they are and clamping a piece of foam filter in the opening of the airbox with the cover of the airbox..... anyone need a oem filter for a 81 cb 650?

riotmachine

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Re: Air Filter Oil
« Reply #14 on: May 06, 2005, 07:03:43 PM »
okay, i know its been said what type of oil to use. i have some UNI foam filters for my 350f and a friend gave me some K&N filter oil, but the spraycan says its for a K&N gauze filter. my question is this - am i going to be doing damage the foam if i use this oil?

thanks much appreciated.

Offline Warlock

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Re: Air Filter Oil
« Reply #15 on: May 07, 2005, 09:05:23 AM »
Greets,
Using the gauze type oil on a foam filter should not damage the media. It will only affect the filtering charcteristics of the foam element. Using a tacky, heavier oil on a gauze filter element is another story altogether...
Ride On...