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grill behing petrol filler cap
https://www.ukbeg.com/forum/viewtopic.php?f=7&t=1643		 Page 1 of 2
Author:  aks12rrrrr [ 16 Jul 2009 15:26 ]
Post subject:  grill behing petrol filler cap
just fitted new air filter over stock and the change is all good :P

but wanted to ask about the grill just behind the petrol cap - whats it for? i always assumed it led through to the air box but it doesn't seem to access the box in any way... i might have missed its purpose as didnt have much time.

if its just cosmetic is it possible to remove the lid of the box so that air can flow in through the grill? or is this going to cause reliability problems?

cheers

aks

EDIT - is it ever possible to have TOO MUCH clean filtered air going in?
Author:  Nate [ 16 Jul 2009 16:56 ]
Post subject:  Re: grill behing petrol filler cap
Think it's mostly cosmetic IMO. there is a gap all around the tank/air filter cover.
I drilled the air filter box on the N/side with a 1 1/4" hole saw. Four of them to get more in't box.

Nate.
Author:  norrie [ 16 Jul 2009 17:56 ]
Post subject:  Re: grill behing petrol filler cap
Isn't that the air intake now that they have done away with the intake through the frame?
I think you'll find that the inner airbox is already full of holes to draw the air in.
Author:  pash [ 16 Jul 2009 18:08 ]
Post subject:  Re: grill behing petrol filler cap
aks12rrrrr wrote:
if its just cosmetic is it possible to remove the lid of the box so that air can flow in through the grill?


You mean like this?

http://www.trojan-horse.co.uk/prods/96.html
Author:  Nate [ 16 Jul 2009 18:20 ]
Post subject:  Re: grill behing petrol filler cap
Who's the chap with the xb special with the name MUELL on the tank?
His is a niffty conversion too.

N.
Author:  aks12rrrrr [ 16 Jul 2009 19:15 ]
Post subject:  Re: grill behing petrol filler cap
norrie wrote:
Isn't that the air intake now that they have done away with the intake through the frame?
I think you'll find that the inner airbox is already full of holes to draw the air in.


as far as i could tell there was only about half a dozen oblong holes like a small grid on the back rh side of the inner airbox, nothing on any other side on the inner box...

pash wrote:
aks12rrrrr wrote:
if its just cosmetic is it possible to remove the lid of the box so that air can flow in through the grill?


You mean like this?

http://www.trojan-horse.co.uk/prods/96.html



that looks ideal but are they really charging £46 + vat and shipping for that piece of red plastic? :o
Author:  pash [ 16 Jul 2009 19:17 ]
Post subject:  Re: grill behing petrol filler cap
Do a search for Ultimate Airbox on the Archive before you make your mind up.

It would be wrong of me not to point you in that direction....
Author:  aks12rrrrr [ 16 Jul 2009 20:22 ]
Post subject:  Re: grill behing petrol filler cap
pash wrote:
Do a search for Ultimate Airbox on the Archive before you make your mind up.

It would be wrong of me not to point you in that direction....


:lol:
am already there having a looksie - also having a look at your, Considerations for doing a "breather mod" thread - looks like i may have found my next mod....

LOL
mcrbuelligan wrote:
thanks for the advice Maz - tubbs, Ive got a K&N in at the mo - is it worth getting the ultimate air box mod ???


pash: IMHO, they are for losers...


subtle 8-)
Author:  sportster_mann [ 16 Jul 2009 21:48 ]
Post subject:  Re: grill behing petrol filler cap
On early XBs there was a hole through the frame that fed air into the airbox - on later models ( 2006 + ? ) they closed off the hole ( that's why later models hold more fuel ) and put a gridded opening in the airbox behind the filler cap, and the inner airbox cover gained a few holes ...
Author:  aks12rrrrr [ 17 Jul 2009 09:29 ]
Post subject:  Re: grill behing petrol filler cap
was just thinking I might make a few holes on the inner airbox directly behind the grill to give a more direct route to the filter as currently the holes are currently on the opposite side of the grill...
Author:  pash [ 17 Jul 2009 09:33 ]
Post subject:  Re: grill behing petrol filler cap
What about the rain?
Author:  mike [ 17 Jul 2009 10:25 ]
Post subject:  Re: grill behing petrol filler cap
pash wrote:
What about the rain?

rain ... i wouldnt add any ;)
Author:  daywalker [ 17 Jul 2009 19:15 ]
Post subject:  Re: grill behing petrol filler cap
sportster_mann wrote:
On early XBs there was a hole through the frame that fed air into the airbox - on later models ( 2006 + ? ) they closed off the hole ( that's why later models hold more fuel ) and put a gridded opening in the airbox behind the filler cap, and the inner airbox cover gained a few holes ...



Is that right? (I have a 2004 XB9SX) Surely the scoop would get more aire especially when on the move?

The grill in the airbox is so small.
Author:  pash [ 17 Jul 2009 21:36 ]
Post subject:  Re: grill behing petrol filler cap
I did some *tests* with a pressure transducer in the airbox with a full 08 and full 05 configuration and the 05 had a higher pressure....
Author:  daywalker [ 17 Jul 2009 21:55 ]
Post subject:  Re: grill behing petrol filler cap
pash wrote:
I did some *tests* with a pressure transducer in the airbox with a full 08 and full 05 configuration and the 05 had a higher pressure....


So there is a ram air effect from the scoop? or are you just talking about using different air box lids and not full 2008 bike (aie inlet from tank cover) vs full 2005 bike (air inlet from scoop)?

If the scoop does make a bigger effect then this would be harder to replicate on a dyno as no rush of air up the scoop?
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