Air Filter Change Interval?

[the Ferret]

I replace my plugs and air filter every 25,000 miles, even though it is still running good at that point. It's just an easy number for me to remember, 25K, 50K and the next one coming up 75K

By my math that’s about 3 weeks.

By my math that’s about 3 weeks.
might take me a little longer than that

[PowerDubs_imp]

Unlike oil filters, an airfilter can easily be checked visually, and kept until it gets dirty. cleaning is often easy too. But you won’t save much, as they’re not expensive.

Actually, they are expensive, more than any air filter I have ever purchased in my life, including motorcycles and cars. I just checked an on-line price, and it is $49.68 plus tax, plus shipping.

Over many many thousands of miles- what's that? A cheap dinner for you and your wife?

We all have our reasons to replace filters and it is good to hear some useful numbers and results.
Sometimes i cannot help myself and look for ways to quantify or measure the size of the problem, I'm curious.

So i looked at some pictures and one showed the drain tube at the bottom of the air filter, this is a clear tube which ends in a black plastic removable plug at the end and is easy to access, since it is in the space of the airbox which is after the filter i thought i could measure the small difference in air pressure when the engine is running.
The result is this small video which shows the change in pressure ( the differential ) across the air filter which has had 57.000 easy kilometers of use.

Could be someone can repeat this test and tell their values, mine only recorded 4 mm. of rise in one end of the tube, the other of course went down by the same amount, hope this sheds some light on the capacity of the air filter;

https://youtu.be/BUrSE-w4zfg

Also wondered if the breather pipe of the positive crank case made a difference, removed the oil filler cap to check and found zero difference in the measurement, i guess my blow-by is not significant enough at this stage.
With my riding style I'm with Tev, it's a big area, so see for yourself.

Max - the video is appreciated- and honestly I am very surprised it went at all to be honest. Imagine it at 8500!!

Can you do me (all of us) a favor?

Try again with filter removed- then with filter in and snorkal off.

Thanks!!!

[max]

Was curious too Josh, here are the 3 scenario's;
1 standard, 2 filter removed with snorkel in place, 3 air filter in and snorkel removed as in the picture with the masking tape.
https://youtu.be/jDayEDJD-NU

Hope that helps and i appreciate things happen differently under load, but that requires elaborate camera work or a dyno.

[PowerDubs_imp]

Fantastic!! Thank you.

As suspected- it looks to me like the filter in / out didn't make much difference but removing the snorkel did indeed reduce the vacuum.

For anyone watching that test- I used these inexpensive and easy to install filters for a modification to get more air into the airbox-

http://cb1100forum.com/forum/showthread....pid=271082

[Mtneers]

At 17k miles…first change:


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[dave]

Thank you mtneers. Your filter doesn't look that bad! I will check my filter this weekend and replace it if it appears dirty.

Has anyone used compressed air to clean their air filter? I do this all the time on my shop vacuum and it works well.

[peterbaron]

50K kms/31K miles

[j3gq_imp]

Unlike oil filters, an airfilter can easily be checked visually, and kept until it gets dirty. cleaning is often easy too. But you won’t save much, as they’re not expensive.

Actually, they are expensive, more than any air filter I have ever purchased in my life, including motorcycles and cars. I just checked an on-line price, and it is $49.68 plus tax, plus shipping.

Actually, they are expensive, more than any air filter I have ever purchased in my life, including motorcycles and cars. I just checked an on-line price, and it is $49.68 plus tax, plus shipping.
Ouch, I had no idea. Guess my guess came from car parts purchased, 2 filters for my old truck at 14.99, is Honda mad ? or is THAT filter so much more sophisticated ?

[PowerDubs_imp]

Economy of scale j3gq - they make a gazillion cars for every CB1100 made.

[tod.branko_imp]

I agree that the CB1100 air filter is the most expensive filter I've ever had to buy, and for those 85$ I'd expect it to at least work well if not to last for a very long time, but then as we live in a very dusty and humid region I think it should still be changed every second oil change just like I do it on cars.

'14 CB1100 STD 5 speed