Herp a Derp, look what mess I'm going to get into!

ok, being as compulsulsive as I am, after it turned out I got my online math homework for free, I had an extra 125 in my paypal, been lookin for days how to spend it, and I've found it: http://cgi.ebay.com/ebaymotors/ws/eBayI ... K:MEWNX:IT

(retails for 350 new, which this is)

so, sometime in the future I'm going to be construction my own airbox, out of some odd diameter chrome pipe and slapping that on the side. I will take out the K/N air filter and put in a paper airfilter, and I'm hopefully going to try and get with some of the fraternity brothers who are actually doing engineering stuff to help me see the (CFM?) and whatnot I will be needing.

any help would be great, as I hope this wont be a tuning nightmare

 

You could cut a hole in the left side of the airbox the same as the outlet on that thing and attach it that way. Of course your leg might cover the inlet.

 

ummm dude.. I dont want to rain on your parade or excitement.. but we did this to a yamaha divy 600 no luck.. tried it on a 900 .. no luck... now the reason I am very weary about this is that both yamahas have issues with carbs.. ie they need to be tuned perfectly and any slight imperfection will cause a malfunction.. I bet the KnN was not the easiest of things to sort out when you put them on.. ie the cone filters...

well imagine that times at least a hundred.. if you get this to work I will be amazed.. really.. they are not easy on yamahas.. a v engine fine.. a flat 4 no way.. expecially aircooled..

 

really?

grrr, well i'm going to give it the ole college try, I know pods are a pain to tune... I thought this would be a little easier because I'm at least going to be constructing an airbox.


who knows, if worse comes to worse, i could wait till spring/ summer and maybe turn a little profit...

 

I have no real experiance with this but my guess says if you dump that air into your stock or a modified air box you should be ok. The issue, as I understand it, is getting controlled amounts of air to the carbs. Pods don't allow this. An air box does.

 

Maybe if I were to run a tube from the hypercharger to the original oval intake....

 

That'd work.
Part of the tuning issue is that the box has a certain crosssectional area as the inlet and part of it is the box has a certain volume which acts as a helmholz resonator which boosts torque at certain RPMs.

So if you keep the airbox volume and entry size the same you would have half a chance.

 

One of the main obstacles to overcome if you have no airbox is:
Turbulence.
The Intake Air at the Horn needs to be:
Shaped.
The Rubber Boot between the Airbox and Intake Horn not only connects the Box to the Carbs; they also perform the function of a VELOCITY STACK.
As the Intake Air is drawn-in from the Airbox's limited opening to the Atmosphere, the Intake Air is limited to the Volume which can pass through the Airbox Intake Rubber Goose-neck.
The Factor is unknown; but stated: Cubic Feet per Minute.
CFM
CFM ÷ 4 = Individual Carb Intake Supply

That Air Supply, drawn into the Engine, enter the Rubber Boot which:
Shapes it.
Makes is a moving column of air.
This non-turbulent, rapid moving, column of air causes a greater reduction of pressure as it passes-over the Emulsion Tube opening to allow the needed decrease in pressure over the Emulsion Tube opening to cause Main Air & Fuel to rise to the decreased pressure area and get sucked-into the Cylinder.

 

uuggghh, I just got back from rush, cannot calculate this... what is the stock cfm? does anyone know?

 

ok guys, I just got it, its totally legit and brand new, suh weet.

but one thing I didnt know, was that the motor pulling in air through the cleaner doesnt control the butterfly valves, instead theres an independent hose that goes to a vacuum source.

however, the butterfly valves are on a spring that keeps them open, and vaccum closes them.... which makes me say, wtf?

how does this work? does vacuum pressure decrease as the engine rev's? it makes no sense to me.

so, I'm thinking of taking it easy on myself and just mounting it on my bike and running the vacuum hose to one of the intake boots, so it will be all show no go

but still let me know how this works on harleys, that there is some kind of decreasing vacuum that opens up the valves

 

Ya you lose vaccum as the engine revs higher

 

phew thank God, this is going to be easy

 

It would be cool if you could make a backing plate hypercharger and hook it to a pvc intake like the one that is on this site, but go out the side, I suppose maybe too much air then? Maybe get away with richening up the mixtures? Just an idea.

 

Yeah, your best bet would be making what this guys made, but stick that thing on the end instead of the filter he has on it.

http://www.xjbikes.com/Forums/viewtopic/t=21057/highlight=pvc+intake.html

 

well, since the I have come to find out that there is an independant vacuum source that opens the valves, i'm going to hook the hose to one of the manifold boots, and then put a large quantity of red LED's where the K&N filter goes. So its going to be a lame show no go, for now... maybe next winter I will hopefully have it up here at tech, and I can spend all the time I want on it

 

Good luck, like to pics once it gets figured out. Too bad there wasn't a deal on 2 of them so you'd have one on each side of the bike.

 

You can use a Handlebar Control from a different Bike.
Plenty Handlebar Controls are the same.
Some with different Part Numbers just have longer or shorter pigtails.

You can use a long one by cutting and splicing-in.
Short ones mean adding-on some wire.
Most of them just bolt-on and go.
Contnrols with different Plastic Connectors retain the same wiring Color Code.
Just lose the Connector end and splice it in.