The Prophet

Here is a nice study done on "Bellmouth's. A little 'techie', but for now probably the best explanation out there.

http://www.profblairandassociates.co...mouth_Sept.pdf

In the list of "Top Ten" misunderstood motorcycle myths (MMM'S!), this "bellmouth" concept would be right up there.

The object is to shape an inlet to allow for the best opportunity to pass the maximum amount of air across an opening, without experiencing disturbing air turbulance, siphoning effects or boundary air layers preventing maximum flow opportunities..

It's not "Ram Air"

It's not "More Air"

It's not "Forced" air.

These bellmouths are often used in different shapes and forms on velocity stacks, therefore many folks get confused because they believe that is ALL that bellmouth entrances are used for. Read closely and study grasshopper!

It's merely the most efficient way to bring air into... something.

If you are bringing air into... something, consider it.

Ride Safe (and efficiently)!

Bob

__________________

• A good traveler has no fixed plans, and is not intent on arriving. ~Lao Tzu
• Motorcyles are not my whole life, but they make my life whole. ` me

The Prophet

Here is a good resource for plastic "Velocity Stacks / Bellmouths" for all you crazy experimenters / mad modifiers out there. Easily glued to plastic Airboxes with various 3M Urethane adhesives (Try #08609)

PORT TUBES from Parts Express ship same day and come with 45 day money back guarantee. Free Shipping Available. Order free 10,000 product catalog.

Originally for Speaker Cabinets, so maybe not as fuel and oil resistant as we'd like, but great for the occasional quick trial.

My thoughts are also that you could heat and distort / bend slightly for say "oval shaped air entrances, etc.

Have fun...

Ride safe!

Bob