forced air induction?

ok this goes out to all the carb guru's....im new to this 2 stroke game, but have years of automotive experience.....im stare'n at my bike and thinkin how i can increase the surface area/air intake to the carb, i filed the intake tube and it sits flush to the inside base of the carb, so i have no visible air leakage, i gained well over a 1/4 inch towards the intake port, and the clamp is less than a 1/4 inch from the bottom of the 45 degree seam/weld of the factory intake.
(note to all...even a cheapo dremel kit is indispensable when building one of these kits as i feel that the more you can dial in the better?)

so, with that im wonderin' has anyone one taken compressed air (regulated down) and "shot it" at the face of the stock air filter housein, with the bike up on stands runnin, and noticed any change in rpm?....im talkin about just a wisp of air equivalent to what you'd get at say 20-25 mph on the road?.....

my whole point to all of this is that im gonna (try) fabricate an airbox/snorkel shaped intake tube out of a Craftsman wet vac attachment that will sit close to the frame and slip fit at a 90 degree over the 4 tubes of the stock plastic filter housein (which will be turned to 9 o'clock lookin from the rear of the bike)..if any of you have a Craftsman wet vac its the attachment that fits the smaller hose its about 6 inches wide at the mouth, has a gentle curve to it and funnels down rather nicely to 2 inches at the hose conection area. i thinkin that it might have the same effect as an exspansion tube on the exhaust side?.....am i gettin over the top here?....can anyone visualize what im seein?....i got the idea from lookin at my friends harley air cleaner that looks like an old hillborn injector hat like they run on top fuel funny cars....i will leave the factory mesh element in place so thers no turbulence..and im thinkin that the carb will have more air to utilize rather than just suckin from the back of the engine at the seat down tube?......

right now i feel like richard dryfuss from "Close Encounters"

.... i just raided the wifes tupperware cabinet and found a small round container...1.1 cup..(rubbermaid).....with a snap on lid...that could be cut to slip over the 4 tube factory intake as well....maybe remove the factory mesh, and fill this with some type of foam,....drill holes in the snap lid and body of it?



any thoughts on this?....good, bad or indifferent.....lemme know....charlie

yep a ram-air..ala olds w30, boss 302..etc...as for shootin air i only ment to simulate the ambiant pressure that you'd see at say 25mph-30mph cause i intend to still use some sort of filter element so i dont think it will go lean? ..hey i don't know?..... but i do intend to try it!...its alot more fun an cost effective to play with these bike kits than car's...as soon as i can re-size pics i'll post 'em......where are you in fla?...thanx for the input ,....charlie

Allen_Wrench said:

A (kinda sorta) super-charged China girl?!?! I'm going speechless at this point.

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speechless....im gettin ready to "twist up a fatty!"....as i dont know if its satire or honest ingenuity???????.....my original thought was to have a positive source of air availiable......but after reading that the jug can and has been 180'd with sucess, it kinda negates the original issue.....why do i think too much?

motorhead419 said:

I race drag bikes and to achieve the proper amount of ram air to make it effective you have to have speed. These china girls don't go fast enough to get the proper ram air effect..Get a 18mm Mikuni and an expansion chamber and match your ports and you will feel the difference. Then you can re-gear for more speed and be able to pull the gear.

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thank -you....nothin better than the voice of experience.........

Ok all...it's done...i actually fabricated a pretty cool lookin cold-air induction today....and i noticed a dramatic difference/smooth response across the whole range of throttle twist...it bolts up to the existin factory carb face/throat/plenum. the choke is fully functional, it doesn't interfere with anything..it is very simplistic in design...tommorow i plan on gettin an NGK plug and doin some evaluation to see if its leanin out the fuel mixture....i did not change any of the factory settings of the needle slot....i probley quadrupled the total surface area in comparison to the stock fluted black cap.....at this time i have no intention of postin any pics or listing what i used.....(i did not use anything close to my original post ie vacumm cleaner snorkel)..i will make several duplicates and i intend to approach Jim in Clearwater...as well as Foureasy in Arizona...and ask them to evaluate it...then we'll see what comes of it.......You all might think im crazy but this is how things get put into production........

Gene1 said:

So, any feedback on the evaluation of the ram air mods?

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no, as i just finished the original yesterday afternoon.....today it will get a good plug....and a fresh tank of high quality oil an gas....and i'll go from there.....let me say, that this is not a quest for horse-power....but more so a half-a$$ed attempt of a tuned source of fresh ambient air, with a smooth transition to the carb throat, the pieces used are seamless with no kinks and by design away from any heat given off by the lil engine.......