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Air Filters

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Jim164
Squiddy
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Location : Woking

Air Filters

Post by Jim164 on Thu 21 May 2015, 9:35 am

Hi There, 

I am thinking of changing the air filters on my CB to the Steel ones , Has anyone done this ? and is this a relatively straightforward process ? I am also trying to find out the diameter that I would need for the replacement parts. 

Thanks 

Jim
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Tricky.
the 900
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Re: Air Filters

Post by Tricky. on Thu 21 May 2015, 5:55 pm

the cb only has one air filter. what is a steel one compared to the other?
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teamster1975
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Re: Air Filters

Post by teamster1975 on Thu 21 May 2015, 6:23 pm

Do you mean removing the airbox and using separate filters for each carb?
I've not seen it done, found this thread on google which suggests not a good idea because it sods up the fueling.
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Jim164
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Re: Air Filters

Post by Jim164 on Thu 21 May 2015, 6:46 pm

Hi teamster , that's what I was thinking about doing , but then I read (probably the same link) about the furling issue . Not too sure what the implications would be , but guess it would get heavier on the fuel and also need work done on the carb . Just toying with ideas at the moment really . 

Cheers for the input , it's awesome to get others point of view before just jumping in and doing these things .
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Tricky.
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Re: Air Filters

Post by Tricky. on Thu 21 May 2015, 8:01 pm

i know some guys that race/trackday these bikes, and they have tried getting rid of the airbox for individual filters, believe it or not, after putting the bikes on a dyno the power was less, even when rejetting was done. mr honda did a very good job with the cb500 airbox.
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badseeds
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Re: Air Filters

Post by badseeds on Thu 21 May 2015, 8:05 pm

Tricky's right. Don't bugger about with the airbox! I put a K&N in mine. Most of us do.
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skyrider
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Re: Air Filters

Post by skyrider on Thu 21 May 2015, 8:29 pm

if Honda cant get it right you cant expect too many other people to Evil or Very Mad
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Beresford
the 900
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Re: Air Filters

Post by Beresford on Thu 21 May 2015, 11:38 pm

There is a steel oil filter which is worth considering if you are a high mileage rider, as it can be washed and reused, but it is expensive.
http://kandpengineering.com/product-catalog/s1/


I think David Silver does them

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Re: Air Filters

Post by Guest on Fri 22 May 2015, 9:13 am

Don't forget the sub-airfilter. I suppose when it has disintegrated dust may enter the carbs that way!
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skyrider
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Re: Air Filters

Post by skyrider on Fri 22 May 2015, 6:57 pm

the sub is only a tichy thing you can wash that and put it back
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badseeds
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Re: Air Filters

Post by badseeds on Fri 22 May 2015, 7:01 pm

skyrider wrote:the sub is only a tichy thing you can wash that and put it back

If it hasn't already turned to dust! I reckon most CB500s don't have a Decent sub-air filter element.
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skyrider
the 900
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Re: Air Filters

Post by skyrider on Fri 22 May 2015, 7:10 pm

that's a wedge for a bit of foam, get it washed and put back or make one out of a sheet of foam stuff those prices


Last edited by skyrider on Fri 22 May 2015, 7:13 pm; edited 2 times in total
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badseeds
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Re: Air Filters

Post by badseeds on Fri 22 May 2015, 7:11 pm

I coughed up for the genuine Honda one and yes, it's just a wee bit thin foam.
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stormbringer
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Re: Air Filters

Post by stormbringer on Sun 24 May 2015, 8:33 pm

badseeds wrote:I coughed up for the genuine Honda one and yes, it's just a wee bit thin foam.
Had the bike serviced recently - valve job - by my overly correct authorized Honda mechanic. As a matter of routine this wee bit got renewed along with a few other bits and bobs. Bike now runs 22 km/l as opposed to 20 km/l pre-fix.
I'm a bit puzzled, because the carbs were not rejetted or anything like that.

Like many others, I use a K&N filter. I like the fact that it's a reusable part. Expensive, yes. But experience has taught me that buying cheap often gets expensive over time.
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ANDYC
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Re: Air Filters

Post by ANDYC on Mon 25 May 2015, 10:52 am

The airflow and vacuum over the jets plays a part in how much fuel flows through the jets, not just the size of the hole.
A clogged air filter will cause a greater vacuum and draw more fuel through the jets. This would create a rich mixture.
A free flowing air filter such as a K+N would create a lesser vacuum and draw less fuel through the jets.
This would create a weak mixture, and so we often have to use larger jets to compensate for this and bring the mixture back to normal.

This is why your bike gets better economy without changing any of the jetting. It would have been running rich which means less power and more fuel used to achieve it.
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stormbringer
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Re: Air Filters

Post by stormbringer on Mon 25 May 2015, 2:09 pm

ANDYC wrote:A clogged air filter will cause a greater vacuum and draw more fuel through the jets. This would create a rich mixture.
A free flowing air filter such as a K+N would create a lesser vacuum and draw less fuel through the jets.
This is why your bike gets better economy without changing any of the jetting.
But the main filter hasn't been changed - only the sub-air filter...
Bike was dynoed & rejetted by a racingbike-specialist a couple of years back, after it'd got its K&N. So I know it's been in working order. Besides, I've got a complete fuel-economy-log covering +30.000 km: 20.85 km/l on average.

But come to think of it; around that time I also got a new helmet (Schubert C3 Pro) which is much less noisy. Perhaps it cuts through the wind better?

So, it appears that correctly set valves + sleek helmet = better fuel economy.

Nothing more to do about the bike.
Now, what about those flappy kevlar jeans - they're definitely causing drag. I wonder if putting them in the boots rather than over the boots will make a difference?

As it is now, I'm doing 410 km on a single tank. Even better fuel economy would bring me closer to 450 which is something like twice the range of my mate's old FJ1200. That'd teach him!
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eternally_troubled
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Re: Air Filters

Post by eternally_troubled on Tue 26 May 2015, 1:24 pm

(correctly) setting the valve clearances can make a difference to the fuel economy, but only if they were quite a long way out in the first place...
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stormbringer
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Re: Air Filters

Post by stormbringer on Wed 27 May 2015, 7:49 am

eternally_troubled wrote:(correctly) setting the valve clearances can make a difference to the fuel economy, but only if they were quite a long way out in the first place...
I suspected that. But the disadvantage of having someone else service the bike (I opted for this because I need the bike running (Alternative: Bus. Yuck!) and some projects simply reek 'Leave this to a pro!') is that you don't know what happened. Were the valves really that much out?

Dunno.

Oh well. I think I'll just be happy that the two of us (Martin + bike) achieve better economy now. I'll then have better conscience trying to ruin its newgained frugality by thrashing the bike around, having a ball.

Which reminds me of a recent event: Last weekend I managed to catch up to a VW Scirocco waiting at the red light on a 2-lane A-road. It all came quite naturally - as the lights went green, he floored it and I stuck to him (he was in the lead, right) like a fly to a turd. As always, great fun to see the revcounter hit 10, but as we approached 70 mph, wind drag struck - hard! I got left behind as this guy simply vanished in the horizon, doing silly speed! CBs aren't meant to do dragracing. I was simply outgunned on the flat & straight!
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eternally_troubled
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Re: Air Filters

Post by eternally_troubled on Wed 27 May 2015, 12:45 pm

stormbringer wrote:
eternally_troubled wrote:(correctly) setting the valve clearances can make a difference to the fuel economy, but only if they were quite a long way out in the first place...

I suspected that. But the disadvantage of having someone else service the bike (I opted for this because I need the bike running (Alternative: Bus. Yuck!) and some projects simply reek 'Leave this to a pro!') is that you don't know what happened. Were the valves really that much out?

Your mechanic is probably decent person - if you ask him or her for the measurements you will probably get them (assuming they didn't throw them away).
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jchesshyre
the 900
the 900

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Location : Chester

Re: Air Filters

Post by jchesshyre on Wed 27 May 2015, 1:04 pm

I'm guessing the Scirocco was an R model?
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stormbringer
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Re: Air Filters

Post by stormbringer on Thu 28 May 2015, 8:18 am

jchesshyre wrote:I'm guessing the Scirocco was an R model?

No idea. It was definitely a third generation. But not knowing much about the Scirocco range I failed to notice any markings.

Oh well. Lunatic at the wheel; this particular road has a 90 km/h speed limit, I lost him at 120 km/h and he surely kept his foot down as he disappeared. On this occasion I got the short end of the rope.

Sometimes you've got to stop yourself trying. Many years ago I was at work, driving my cab - a Volvo 850 estate - through thick fog in unknown territory. I found a set of tail lights going my direction and followed. Thick fog. Driver in front kept going faster, and at some point I decided to chicken out. It was becoming obviously silly.

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