Ducati Sporting Club UK > DesmoDue Race Series > DesmoDue - General Questions and Chat > no air box

[yorkie]

I fitted some of these to my 900ss engined Monster:

http://www.unifilter.com/online%20ca...universal.html

Got a nice induction roar as a pro!!

Yorkie

[bally71]

Originally Posted by yorkie

I fitted some of these to my 900ss engined Monster:

http://www.unifilter.com/online%20ca...universal.html

Got a nice induction roar as a pro!!

Yorkie

looks just the ticket

hmmmm ... what about a couple of small air scoops with an in line filter?

[skidlids]

I think AK tried ram air several years ago without any real success.
As my 620 uses the same size airbox, throttle bodies and injectors as my 1000SS I doubt there is much that is holding back the performance once the airbox lid is opened up.

As Andy Pike says a Plenum chamber is one of the best ways to go so as to create a large reservoir of still air for the engine to be able to draw on, so long as that air can be replaced as quickly if not quicker than the engine uses it then it should be able provide the desired air/fuel ratio through out the rev range and not be effected by speed

[bally71]

ah but it's not just performance kev .. it's the joy of creating something different .. and something you can blame when your slower than everyone else

[bally71]

does the airbox create a reservoir of still air? ..after all it's being constantly drawn

i can imagine with the trumpets in place you could expect the incoming air to be sucked in in a nice laminar fashion .. but with the top hacked off??

[chris.p]

Originally Posted by bally71

does the airbox create a reservoir of still air? ..after all it's being constantly drawn

i can imagine with the trumpets in place you could expect the incoming air to be sucked in in a nice laminar fashion .. but with the top hacked off??

Once the air has been drawn into the air box from the previouse induction cycle the air will be still (still as in not swirling around the airbox) this allows maximum induction suction on the next induction cycle.
The stiller the air, the larger amount can be drawn in, the more air the better the fuel air mix and the bigger the bang


Chris

[bally71]

but with this happening a couple of hundred times a second .. hardly a sea of tranquility

how much air is required for max combustion .. think i remember reading somewhere it was 130% of the cylinder volume

so at 9000 revs that's about 120 litres per second (if my maths is right)