Increasing air flow - TwoWheelForum: Motorcycle and Sportbike forums
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post #1 of 30 (permalink) Old 08-27-2006, 03:24 PM Thread Starter
 
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Increasing air flow

Fire screen removal on the air filter... yay or nay?
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post #2 of 30 (permalink) Old 08-27-2006, 06:01 PM
 
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Nay. its there for a reason, engineers put these things in because they serve a purpose so I'd leave it in place. port and polish the intake and exhaust, and you should be pretty good.
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post #3 of 30 (permalink) Old 08-27-2006, 06:56 PM
 
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I don't know what kind of bike you have, but on my F4i, the screen helps the rigidity as the filter lays across the stacks...I would think it might get "sucked" down into the stacks and could actually reduce air flow
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post #4 of 30 (permalink) Old 08-27-2006, 09:31 PM Thread Starter
 
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This is someone elses pic but it's the same deal. And this is the quote that goes with it.

On the intake side, the single greatest restriction to flow is the air filter. Stock filters are about the best way to filter air and they have a good service life. One easy modification to improve performance without loosing the ability to clean air is to remove the fire screen. This screen further restricts flow, and only serves to prevent a horrific fire under your gas tank and chest. Screw it, speed thrills.

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post #5 of 30 (permalink) Old 08-28-2006, 03:28 AM
 
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Originally Posted by ironmannFB3 View Post
This is someone elses pic but it's the same deal. And this is the quote that goes with it.

On the intake side, the single greatest restriction to flow is the air filter. Stock filters are about the best way to filter air and they have a good service life. One easy modification to improve performance without loosing the ability to clean air is to remove the fire screen. This screen further restricts flow, and only serves to prevent a horrific fire under your gas tank and chest. Screw it, speed thrills.

Only prevents HORRIFIC FIRE UNDER YOUR GAS TANK ?
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post #6 of 30 (permalink) Old 08-28-2006, 03:39 AM
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Only prevents HORRIFIC FIRE UNDER YOUR GAS TANK ?
one little hiccup could be disastrous.

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post #7 of 30 (permalink) Old 08-28-2006, 03:39 AM Thread Starter
 
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Lol, in order for that horrific fire to happen, there needs to be a problem occuring elsewhere, and that sounds like dry humor to me that he is using. It's not like you are trapped on top of your bike... It appears I am playing devils advocate to create arguement

Last edited by ironmannFB3; 08-28-2006 at 03:41 AM.
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post #8 of 30 (permalink) Old 08-28-2006, 03:48 AM
 
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Lol, in order for that horrific fire to happen, there needs to be a problem occuring elsewhere, and that sounds like dry humor to me that he is using. It's not like you are trapped on top of your bike... It appears I am playing devils advocate to create arguement
I say remove the screen, put some 112 octane race fuel in it, tune it as lean as possible, slow down to 25mph in your highest gear and romp the throttle creating spark knock, and burn up your chest, arms and nads when the tank explodes.
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post #9 of 30 (permalink) Old 08-28-2006, 03:54 AM Thread Starter
 
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except that octane level is too high for my bike. i'd be using a modified 87 octane fuel. And yup, that is just what I would do every day cause that's a great idea and it would happen to me all the time. I usually hang an open ice cream bucket full of spare gas from my rear fender too, just incase i should ever run out.

Last edited by ironmannFB3; 08-28-2006 at 04:02 AM.
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post #10 of 30 (permalink) Old 08-28-2006, 03:55 AM
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Only 87?

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post #11 of 30 (permalink) Old 08-28-2006, 04:10 AM Thread Starter
 
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Yup. I researched it. Technically the bike will run without knock all the way down to 81 octane, but 87 is what they put in the service manual. It doesn't make any sense to use more octane than I need. Slower burn without knock means better gas efficiency, cooler engine, ect... Creates a more isentropic reaction compared to a fuel that blows its whole load right away. More energy is converted into displacement than heat energy that way. Thermodynamics.

Last edited by ironmannFB3; 08-28-2006 at 04:13 AM.
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post #12 of 30 (permalink) Old 08-28-2006, 04:27 AM
 
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It doesn't make any sense to use more octane than I need.
Slow down Forrest, I was making a funny.
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post #13 of 30 (permalink) Old 08-28-2006, 04:31 AM Thread Starter
 
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I'm a natural smart ass. i knew you were just joking and figured I should go overboard with the responce. Go hard or go home... or go hard and send her home.
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post #14 of 30 (permalink) Old 08-28-2006, 04:56 AM
 
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or go hard and send her home.
after she does my dishes and laundry!
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post #15 of 30 (permalink) Old 08-28-2006, 06:02 AM
 
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after she does my dishes and laundry!
ooooooooooooooooooooooooooooooooh.



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post #16 of 30 (permalink) Old 08-28-2006, 09:30 AM
 
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after she does my dishes and laundry!
I thought that's what boyfriends were for...
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post #17 of 30 (permalink) Old 08-28-2006, 10:34 AM
 
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Yup. I researched it. Technically the bike will run without knock all the way down to 81 octane, but 87 is what they put in the service manual. It doesn't make any sense to use more octane than I need. Slower burn without knock means better gas efficiency, cooler engine, ect... Creates a more isentropic reaction compared to a fuel that blows its whole load right away. More energy is converted into displacement than heat energy that way. Thermodynamics.
Bertrand's Theorem





A theorem first formulated by Sturm (1841) and related to the least curvature principle of Heinrich Hertz and Gauss. It states that, if a given set of impulses is applied to different points of a system in motion (either holonomic or nonholonomic), then the kinetic energy of the resulting motion is greater than the kinetic energy which the system would acquire under the action of the same impulses and constraints and of any additional constraints due to the reactions of perfectly smooth or perfectly rough fixed surfaces, or rigid connections between the particles of the system (Whittaker 1944, p. 260).

Another "Bertrand's theorem" states that the only two central force laws expressible as functions of r that give rise to closed orbits independent of initial conditions are linear and inverse square, i.e., Ar and (Bertrand 1873; Goldstein 1980, pp. 90-94). This follows from that fact that an orbit with force law f is almost closed if is rational.
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post #18 of 30 (permalink) Old 08-28-2006, 12:34 PM
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Only prevents HORRIFIC FIRE UNDER YOUR GAS TANK ?
Aren't one piece suits flame retardant?
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post #19 of 30 (permalink) Old 08-28-2006, 01:08 PM Thread Starter
 
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Bertrand's Theorem





A theorem first formulated by Sturm (1841) and related to the least curvature principle of Heinrich Hertz and Gauss. It states that, if a given set of impulses is applied to different points of a system in motion (either holonomic or nonholonomic), then the kinetic energy of the resulting motion is greater than the kinetic energy which the system would acquire under the action of the same impulses and constraints and of any additional constraints due to the reactions of perfectly smooth or perfectly rough fixed surfaces, or rigid connections between the particles of the system (Whittaker 1944, p. 260).

Another "Bertrand's theorem" states that the only two central force laws expressible as functions of r that give rise to closed orbits independent of initial conditions are linear and inverse square, i.e., Ar and (Bertrand 1873; Goldstein 1980, pp. 90-94). This follows from that fact that an orbit with force law f is almost closed if is rational.
Now did you understand anything that you just said cause I'm not sure if I did or that I agree. Sounds like theory yet to be proven. Anyway, I was talking more along the lines of entropy (wasted heat energy). The closer that engine comes to being an adiabatic(no heat loss) steady state process, the higher its efficiency will become. It probably has something to do with engine timing too so I'm going with those folks over at honda, cause they're the ones who designed it.

And to all of those who think that I was actually gonna do this... I have neither the time or the money. That would change my intake throwing off the stock settings, meaning I'd have to go out and buy a P3, then I'd have to pay a tech to remap my system and pay to use the dyno to do that = headache and smaller wallet. I think of lots of things to do to my bike, but that doesn't mean I should, lol. That brings up an interesting question, does putting on an after market exhaust help at all if you don't remap your system? I see a lot of after market exhausts and hardly ever a power commander unless its on some squids bike with NOS and the works.

Last edited by ironmannFB3; 08-28-2006 at 01:14 PM.
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post #20 of 30 (permalink) Old 08-28-2006, 01:18 PM Thread Starter
 
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I had to double post this cause I didn't see psychos post.

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Aren't one piece suits flame retardant?
And if your bike does catch fire just pin the throttle and put it out like a jet fighter would!
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