Ram air diameter...

[Codoloco]

    Im gonna make ram air, maybe for more flow increase, maybe for looks, maybe a little bit of both or a complete fail, I've already painted my airbox but Im on the fence on how big of diameter I should go for the hose/pipe that connects to the front air scoop.  I figure as big as possible but it might be too much, meaning the smaller the hole, the more pressure.  I was thinking 2 x 3" (diameter) at first(flex hose) but was thinking 2" also. The diameter of the airbox filter hole is 4"so if I go 2 x 2" the airflow would be normal, the same as stock? but if i go say.  2 x 2 1/2"(diameter) flex hose, I gain one extra inch of airflow. Not sure though if too much airflow is no good, I probably have to rejett or move the carb needle.  I should look at a ram air forum, but so far since of joined 2013 its been %100 cool opinions.  Not sure if Im making any sense either... without any pics

[lucas]

I say just go straight for the looks.  If you aren't engineering this thing to have certain pressure and flow characteristics and modifying your design based on dyno measurements just stick to the looks and I think you can have good success for yourself in this project.

Trying to predict from this side of the continent what is going to generate power in your setup is likely not going to help you in your quest.

That said, yes, we definitely need pics urgently.

[Big Rich]

Codoloco, there are MANY factors for you to consider with this. I'm not saying that to discourage you by any means, but I just want you to know there will be some hurdles ahead of you.....

First, let me say that I'm a large scale machinist - not an engineer. An engineer would give you much better advice. If you go with the same diameter hose at what is on the airbox, you'll be choking the air supply at higher wind speeds (Google for air turbulence inside a pipe, and the Reynolds number / effect). The duct material you use has a large effect as well. Another thing to look into is airbox design - it seems like an airbox is made to just barely fit inside of whatever space it can, but there's a lot more that goes into it. From internal volume, port length and shape, ability to drain water (and gas / oil residue), etc.

[Codoloco]

http://www.homehardware.ca/en/rec/index.htm/Heating-Ventilation-Cooling-Home-Comfort/Ventilation/Duct-Pipe/Galvanized/3-1-4-x-10-x-4-Universal-Boot-Duct/_/N-ntims/No-240/R-I3855162?Num=1

http://www.homehardware.ca/en/rec/index.htm/Heating-Ventilation-Cooling-Home-Comfort/Ventilation/Duct-Pipe/Flexible-Non-insul/3-x-8-Flexible-Aluminum-Duct/_/N-ntimt/R-I3721486?Num=1
Im in Canada...

I figure I use this material and ducting (paint it the same color as my bike).  I can buy 2 galvanized universal boots (top link) for the scoops for each 3" pipe (bottom link) and mount them underneath the headlight, vertically, side by side, painted the color of my bike.  Use the 3" aluminum flex duct and plum into the existing stock airbox on each side.  The another thing is attaching the 3" pipe to the airbox, either I drill 3" holes and force in  or use some sort of 22.5 degree vacuum adapter that I can screw on the airbox.   That makes sense though lucas, I may be getting into something that is irrelevant in the end.  It would have to serve some purpose though, considering the airflow is coming from the front.  Its just the rejetting issue.  I could start out with the needle and work my way up to bigger jets.   I'm glad I checked that out Rich,  I found some 3" hose which would (in my piped dreamed theory) give me 6 inches of flow overall, adding 2 extra inches of flow? Thats where I have no idea though because Im not an expert in neither,  am I just doing this for looks or would they actually serve a purpose.

The interesting thing though, is in this link http://www.eurospares.com/munn.htm this guy did it and raced with it setting record laps at the same time and in this one, mind you heavily modified, he did it as well  http://www.sportrider.com/oxymoron?image=1

This one shows the results in lower displacement bikes  http://www.sportrider.com/ram-air-test-part-deux  it may make a difference if done right.  My problem is gonna be the rejetting/tweaking issue after the install,  at least if it does fail it may look cool or not...

[lucas]

Any update on this project?