Quote:
Originally posted by Flanners
I have the carbon air scoops and a foam filter over the stacks. What real world power loss are we talking about? |
To summarise Shazaam's previous postings (if I'm reading it right! )...
It's all about volumes of air, both filtered and unfiltered, that the engine can suck in.
Basically your bike works better when it has plenty of air to suck in. However, you need to filter that air to remove the dust, grit and small animals. Sucking air through an air filter is harder than sucking it straight in - therefore some "effort" is required to filter the air, which means something loses out.
The way Ducati set up their bikes with a very large surface air filter in the tubes means that air can be sucked into the airbox quite easily, so you end up with a large volume of filtered (clean) air in the airbox ready to be sucked in.
If you put a smaller surface area filter over the belmouths, this filtered air all but disappears - air has to be drawn through the filter as there is no "reserve" of filtered air in the airbox.
You will mainly notice the difference in throttle response rather than outright power.
From the diagram that Rockhopper posted, you can see just how fickle the engine is at drawing air into the belmouths with different designs of belmouth edge - think of the effect that putting a filter on top of this has!
For me, the ideal setup would be Pipercross MPX038 stock-replacement filters. These have better filtration than stock filters and are reuseable too - a bargain at around 18 quid a pair.
If you want to get really picky, spend the extra few quid on carbon tubes that take stock filters and use the Pipercross ones.
You can see Shazaam's original article here:
http://ducatisportingclub.com/contro...d.php?tid=1701
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