K&N Filters

A short while back I posted a statement to the effect that my use of K&N filters boosted mileage and performance in my two new Honda cars (civic
hybrid and Element both 05). After putting about 5000 miles on the Element's filter, I took it out for an inspection. It was filthy!!! This I imagine is what an air filter is supposed to do. As for those of you who so kindly responded to my original post of the same topic, I'd like to thank you. You've more than ever convinced my of the efficacy of this filter system.and its claims for increasing mileage and performance. By the way, my Hybrid is now getting over 49mpg in mixed city/highway driving. I imagine it will improve even more on long highway trips. Again thanks all for your contributions.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On Fri, 05 May 2006 02:10:20 GMT, "Theodore Kaplan"

ok, look at it like this. See your filter and a regular one. look at the different in hole sizes. also look at the volume of your filter that is filter, and that is gaps. look again at the filth you've collected on the parts that filter. If the filter is 50% gap by vcolume, that at best case, at LEAST as much dirt that has been trapped by the filter has gone into the engine. on a regular filter, its less than 0.1% air by volume. Of course, that figure is best case, you're neglecting the air currents, which mean that the fastest-flowing air (ie the most undesturbed bits, or the bits that don't touch the filter) can carry the most. a 200mph tornado can carry objects a lot more than 20x heavier than a 10mph wind. Also, your filter would, for peak efficiency stop every particle that touches it, and doesn't have a bit of dirt hit another piece of dirt already trapped and bounce in. Was the filter equally dirty throughout, or were areas like the outskirts, or a certain side dirtier? (not sure what K+N you've got, when I think of them I think of the ones we used in the late 80s, that wasn't ore than a loose weave coasted in oil, and which we cleaned every 200-300 miles. wasn't that we were gong anywhere particularly dirty, just that after that milage it got caked up so much it worked less efficintly as a filter,.
Again, remember, you're getting better milage because you're getting better airflow in, you're getting better airflow in because the flow rate is better, because its less obstructed. Its the air hitting the obstructions that cleans it, so you are in effect boasting about how much moire dirt you're letting in.
most people are amazed at how much dirt thre is. just another thing to think of, - fiberos filters get dirty, they get blocked up, and actually trap MORe dirt, at the expense of performance. wet-surface filters lose filtering performance.
again, a lot of this is moot if its not wet-type filters any more, but i doubt k+n have changed that much
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Umm probably not true as far as mileage increase on the highway for a hybrid.
A hybrid gets better mileage due to the battery power assist from a stop. and charges using the regenerative braking system. On the highway, you don't do much braking or starting from a stop. The only thing that will get your better mileage would be a lower displacement engine, though even that is debatable as a smaller engine may bog down if underpowered, causing lower mileage.
Hybrids are designed for city driving. If you do a ton of highway driving, the technology you need is the VCM that comes with the new Oddy, shuts down 3 out of 6 cylinders when RPMs are unchanged for a certain period of time. Unfortunately, they don't offer this on 4-cylinders.
As far as K&N filters, posting something about these on this group you are just waiting to get flamed. Looks like you know that.
I for one have had a K&N drop in filtercharger on my 98 civic since 80000kms. I am now at 250000kms, same filter (I have cleaned it on at least 4 or 5 occasions).
I did a compression test last month, and came back with 190lbs in all 4 cylinders (ok I had 210lbs in Cyl 4, probably some carbon buildup. I been babying the engine lately to save gas). I do about 60hwy/40city. I also do alot of driving on gravel roads, as I spend a lot of time in rural Manitoba Canada. So in my case, the theory that K&Ns don't filter particulates of a certain size and causes a compression decrease doesn't seem to hold water....
I recommend K&Ns simply because they make financial sense. I can't say I noticed a mileage gain. The performance gain is minor, and probably not real. .. the filter causes an exciting whistle when I wind the engine up to 6500- 7000 RPMs, sounds like a turbo!
t
Theodore Kaplan wrote:

--
Message posted via http://www.carkb.com

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Your statement to the contrary, the 05 civic hybrid never runs on electricity alone as do the 06's. Therefore, assuming a steady highway speed, the mileage is in fact better than stop and go city driving (in NYC anyways). This car does in fact have the cylinder management system whereby some of them are shut down when not needed. Thanks for you response. As for the flaming....who gives a shit!!! we're all entitled to our opinions.

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.