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

[SeeleyG50]

IMHO: There is only likely to be one 'gain' in junking the complete airbox and that is the weight saving. You are extremely unlikely to make any performance gains sticking filters in the end of the inlets. Most 'Classic Racers' dream of still air boxes/plenum chambers. Get it built properly and a 620 will do 65bhp with the air box (lid cut open and foam filtering place) fitted!

[bradders]

mine made nearly 64 with it on, just open lid and good filter. Only reason I wanted to was makes access easier and wanted to fit different tank

[dunlop0_1]

Originally Posted by SeeleyG50

IMHO: There is only likely to be one 'gain' in junking the complete airbox and that is the weight saving. You are extremely unlikely to make any performance gains sticking filters in the end of the inlets. Most 'Classic Racers' dream of still air boxes/plenum chambers. Get it built properly and a 620 will do 65bhp with the air box (lid cut open and foam filtering place) fitted!

Ditto, if memory serves about 1.6kgs

[bally71]

at the moment its lid off with no filter.

i didn't expect to get any extra horsies .. just want to lose the weight and gain some space

[chris.p]

Originally Posted by bally71

at the moment its lid off with no filter.

i didn't expect to get any extra horsies .. just want to lose the weight and gain some space

Not the best of ideas, you really need a filter, it only takes one trip into the kitty litter for the engine to ingest gravel or any other foreign object to play havoc with your engine internals. Remove the lid, but leave a performance air filter in place.

Did a dyno run a few years ago on a 583 class B, very little gain in hp, less than 1bhp.

If weight saving is your main aim, look at other items, the battery is the biggest area to lose weight, trim the frame of excess bits, make sure your fairing is as light as it can be etc.


Chris

[bradders]

agree - some filter is needed and helped witrh power rather than reduce on my 583...not sure of difference on a 620 as didnt try it. But dyno man tried with pods v with airbox and set up with pods would have been much harder he said

[bally71]

ran my 800 for a year in minitwins with no filter

back to back dyno runs showed a 4 - 5 horse increase all through the curve without one

had a good classics set up in the w100 club .. always liked the look and sound of the open carbs

admitedly i'd be a little nervous just having the throttle bodies open to the atmosphere at least the airbox affords some protection

[skidlids]

Originally Posted by bally71

ran my 800 for a year in minitwins with no filter
back to back dyno runs showed a 4 - 5 horse increase all through the curve without one

Did you have different maps done for both, or was it a case of adding the filter richened the mixture and lost 4 - 5 bhp