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#11
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#12
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> wrote in message ... > > If you just want the bike to run better, get a K&N (small version of > what Krusty had in his power plant). When I was in the business, > they made them to fit your Honda. Far better than the stock paper > grit-strainer. > > Tom Willmon > near Mountainair, (mid) New Mexico, USA > (In the '70's, owner, Sun Cycle, Rockville, MD) > > Net-Tamer V 1.12.0 - Registered Getting an U-tube to work is simple and accurate. The rest of the test is not, I think. I have never seen any proof that K&N is broadly 'better' than anything else. 'Better' entails a lot of criteria. 'Better' at what? You need to have a constant and measurable flow of air, for delta P to mean anything at all. Low delta P doesn't mean too much about filtration efficiency, if you are interested in that, and if not just dump the filter and suck in anything that comes your way. Filters often become more efficient at removing small particles when they become least efficient at passing air. |
#13
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#14
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Matt wrote:
> I have the left and right used filters, and I'm trying to determine > whether to replace them, as they run about $45 each off the shelf. I > was able to buy a NOS right filter on ebay for $16.50 delivered. I > tested all three of these filters. > In "Experiment 1" I found that both the used filters developed a > differential pressure near 40mm H20 and that the new right filter > developed about 19mm H2O. > > For "Experiment 2" I made some improvements in the vacuum setup (cleaned > the shop-vac, used a shorter cord, straightened the vacuum hose). Then > the DP was about 58mm for the used filters and 44mm for the new filter. > > I could use some help in interpreting the data ... Well, even the 58mm DP is less than a tenth of a pound, it's actually about 1/3rd of the DP that would cause a pressure alarm across the big K&N filter at the cogeneration plant. And your operating conditions are nowhere near as dusty as the ash removal system I described. As long as you now have a new filter, you should be able to see if the right hand cylinder still makes the spark plugs sooty... Then try NO filter at all and see what happens. If the cylinder stops carbon fouling, you know it's an intake side problem... |
#15
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Matt wrote:
> G C wrote: > >> Don't know on a scooter, but in my spray booth, I change filters at >> 2.5 to 3" WC. > > > Sorry, what is WC? water something ... > >> This is where I loose the required air velocity (100fpm) across the >> face of the booth. The easy way to check is to measure a new filter >> and an old clogged one. If all you want is to find the lowest >> restriction, you don't need a baseline to start. >> The DP is really only important at normal operating load, however. > > > I'm thinking maybe I can fill a clear tube with ATF and strap it to the > handlebars. WC water column, inches water. I forget the amount but it's something like 1 inch mercury is 124" water. Domestic gas pressure and filter differential are the only things I know measured in WC. -- Gopher 33 28 19N 112 01 49W '77 CB750K '78 CB750K '00 ZG1000 '96 Ducati 900SS **********pull 'mychain' to reply*********** ("I've abandoned the idea of trying to appear a normal, pleasant person. I had to accept myself as I was, even if no one else could accept me. For the rest of my life I would continue to say precisely the wrong thing, touch people in the raw and be generally unpopular. I had a natural gift for it" W. F. Temple) |
#16
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Matt wrote:
> Don Stauffer wrote: > >> Likewise, this stuff about how dirty air filters affect fuel milage >> bothers me. Since the eighties epa regs required carb float chambers >> vented not to atmosphere, but to plenum between air cleaner and carb. >> I believe modern FI also measures ambient air pressure there, so fuel >> is NOT SUCKED into manifold by pressure drop across air filter. > > > In a carbureted system, a plugged air filter acts about like a choke. Not if the float chamber is vented to the area between the filter and the throttle valve. It only acts as a choke if float bowl vented to ambient atmosphere. |
#18
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Matt wrote: > > In "Experiment 1" I found that both the used filters developed a > differential pressure near 40mm H20 and that the new right filter > developed about 19mm H2O. > > For "Experiment 2" I made some improvements in the vacuum setup (cleaned > the shop-vac, used a shorter cord, straightened the vacuum hose). Then > the DP was about 58mm for the used filters and 44mm for the new filter. You're seeing a velocity squared effect... The increase in delta p can be explained by the dynamic pressure of the air molecules striking the filter medium at a higher speed. dynamic pressure = 1/2 density X velocity^2 dynamic pressure is in pounds per square foot sea level air density of dry air at 59 degrees F is 0.002377 slugs per cubic foot (a slug is a unit of mass density, multiply a slug of air times 32.2 and you get the weight of a cubic foot of air---it ain't much velocity is in feet per second |
#19
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Don Stauffer wrote: > Matt wrote: > > > In "Experiment 1" I found that both the used filters developed a > > differential pressure near 40mm H20 and that the new right filter > > developed about 19mm H2O. > > > > For "Experiment 2" I made some improvements in the vacuum setup (cleaned > > the shop-vac, used a shorter cord, straightened the vacuum hose). Then > > the DP was about 58mm for the used filters and 44mm for the new filter. > That is a couple of inches of water. I am trying to remember what > atmospheric pressure is in inches of water. Seems to me it is abut 16 > feet, right? That would be 192 inches. If so, those filters are not > lowering pressure at intake by all that much, as would be expected. > Most air cleaners really are quite efficient devices. The static pressure of one foot of water is 0.433 inches... So 40 millimeters times 0.0394 = 1.576 inches 1.576 divided by 12 = 0.131 0.131 X 0.433 = 0.056 PSI |
#20
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"krusty kritter" > wrote in message ups.com... > > You're seeing a velocity squared effect... > I agree...Pressure alone doesn't tell the whole story. Do you think he could adapt a second u-tube to measure the dP parameter of airflow through an orifice plate, and correct it accordingly? |
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