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WTF: 2013 RR airbox

16K views 51 replies 24 participants last post by  Jono 
#1 · (Edited)
I'm trying to learn a little more about my new Brutalina (2013 RR) and disambled her a little....

When I took off the airbox to check out the snorkles I was somewhat upset.

Just check out the pics from inside:









Here are the snorkles that are different from the 1078:




There are 3! (not 4) round tubes with holes (for screws??) inside the airbox.

I cannot see any "order" or these tubes so.

But imho they cut the airflow dramatically as they are in the near of the velocity stacks.

What is the function of these :rolleyes: ??

I've read here that some tuners modify the airbox to increase hp - may be they cut these tubes off ??

What are your thoughts on this??

Jochen
 
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#2 · (Edited)
Got new info.

Also the 2011 RR got these tubes in it's airbox :jsm: . So that is "normal".

These tube are about 2" high, the airbox itself only is app. 4,4" high. And the velocity stacks stick in a lot........

What is the use of these tubes? Some kind of Helmholtz resonators?

Do they improve hp and torque or do theys cut them only to bring noise down to the latest requirements?
I'm thinking of eliminating them to hear the Diva screeeeeeam :f4:.

All models prior to the 990/1090 did not have these tubes........

Really nobody an idea?

Jochen
 
#3 ·
All those 'bits' are there for a reason - either to smooth the power/torque curve or for noise reduction. Unless you have lots of dyno time I would be reticent to play around with something that has had years of development.
 
#33 ·
All those 'bits' are there for a reason - either to smooth the power/torque curve or for noise reduction. Unless you have lots of dyno time I would be reticent to play around with something that has had a FEW DAYS of development.
Fixed^


Good call chopping the airbox up. I really can not see the 675 having those things in there as the induction noise is like nothing else. So maybe they are baffles to divert any loose screws or rivnuts from going down the stacks. Lol.

There is no better sound than an MV on the gas.:f4:
 
#13 ·
In an interview of a German Motorcycle journal Castiglione told that their R&D department consists of 27 people - app. half of them are technicians :jsm: . That's all......

I got an used B5 airbox through ebay where I will cut off these weird tubes. Will let you know.....

Jochen
 
#16 ·
I think what Noel is trying to say is, hell, I don't know, perhaps it is for noise tuning...my first thought....then all those pressure waves started to bounce around in my head.....
 
#17 ·
...as an afterthought, remember, we are the people who can't put a battery in with the polarity correct...:smoking:
 
#19 ·
NEWS:

Got my used 990R airbox - it has the same weird tubes in it :jsm: . Production date of the plastic parts is 2009 - so all B5 should have this design of the inner airbox.......

BUT why did not one B5 owner notice it :stickpoke????

Here are some pics of the disassembled airbox.

I really cannot immagine how this assymetric design shall work :rant:.

Also took a pic of the 2013 RR intake - it should have larger diameters and shorter stacks than 2010-11 RR models and the R models.











What do you think about the Italian design of the intake tubes??
 
#20 ·
Well, there is a certain manufacturing and materials cost to those tubes...there is a reason for them...somewhere.
 
#25 ·
News:

I made contact to a well known engine tuner here in Germany. That guy did many Moto2 engines.........

I sent him the pics of the B4 airbox with these weird tubes inside.

His comment:
He never saw anything like this in any other bike he did. It would not create any power at any revs. The only explanation could be noise issues concerning legal regulations.

I did mount my tube-free airbox without snorkels and could not find any bad thing about it. But that thing now screeeeeeams :yo:.

Outer butterflies were adjusted a tiny bit.

Jochen
 
#26 ·
It looks like a setup based purely on engineering airflow, where based on the shape of the chamber, location of the air in and air out it would equalize the air pressure and flow to each throttle body intake.

Probably designed by very smart people who are practically stupid.
 
#27 ·
These inner tubes are very high inside the airbox and there's only very small space between the trumpets. Cannot imagine how this should work at higher rpms as the trumpets are covered a lot......

Would like to see a newer F4 airbox from inside.....
 
#30 ·
Hmmmmmmmmmm,

what would you like to talk about instead of Brutale airboxes then :laughing: .
 
#31 ·
Love your work, Dave....
 
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