zxrlocost
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| posted on 17/2/06 at 12:45 PM |
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my bike engine came with a k&n in the air box already.
me thinks ill keep it
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Hellfire
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| posted on 17/2/06 at 12:51 PM |
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G.Man, are you talking about the ally airbox for the ZX12R. If so, we were given the design and drawings for it and intend manufacturing one in the
very near future.
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G.Man
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| posted on 17/2/06 at 12:52 PM |
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quote:
Originally posted by Winston Todge
Ta for that Mark.
Finally, what's a 'kit airbox' Mark? Is it the BSB or WSB term for factory race kit?
Cheers again,
Chris.
Chris
A kit airbox is one that the bike manufacturers develop for their race bikes and sell to race teams (or give to if factory supported) for use on their
race bikes..
They are usually VERY expensive..
Other kit parts include things like, gearboxes, clutches, radiators (usually ally and huge) and other parts not restricted by certain race class
rules...
Opinions are like backsides..
Everyone has one, nobody wants to hear it and only other peoples stink!
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G.Man
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| posted on 17/2/06 at 12:53 PM |
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quote:
Originally posted by Hellfire
G.Man, are you talking about the ally airbox for the ZX12R. If so, we were given the design and drawings for it and intend manufacturing one in the
very near future.
Yup thats the baby... if you do make some for sale I will be VERY interested...
Opinions are like backsides..
Everyone has one, nobody wants to hear it and only other peoples stink!
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INDY BIRD
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| posted on 18/2/06 at 08:40 PM |
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I Have a blackbird engine with a std airbox turned upside down and fits under JUST, and seems to run very well but needs tunning on RR dyno as top end
a bit flat,
if i fit a k&n filter will this need re jetting?
sorry to but in on r1 question but i was also going to get a foam filter but the induction noise may be a issue for track days, certainly on my
brothers ZX12R the engine noise is way louder than the exhaust with a carbon R1 can so could be a probelm???
any ideas grateful?
sorry for the hi-jack of the pol
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smart51
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| posted on 18/2/06 at 08:47 PM |
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I looked at my air box today and then tried to look at the foam filter on my car when shutting the bonnet. It seems that the filter just touched the
bonnet when closed. No room at all for the air box.
It is the shape or volume of the box that is important? If I made one with the same volume and used the top half of the existing box with the inlet
tubes moulded into it, would that have the same effect?
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G.Man
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| posted on 18/2/06 at 09:11 PM |
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Best bet is to build an airbox that fits to the bonnet, that way you can take off the bonnet and airbox as one...
Yes the shape is important for ultimate BHP, but better to have it breathe well than strangle it...
A good airbox is a series of chambers, much like an exhaust to baffle the noise...
need like a Box on the inlets, then the bonnet becomes the top when fitted..
Rubber seal around the box to make it airtight, then a duct to the front of the car to draw in cool air... or chambers fed from a bonnet scoop, even
better...
Opinions are like backsides..
Everyone has one, nobody wants to hear it and only other peoples stink!
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Winston Todge
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| posted on 19/2/06 at 09:51 AM |
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Interesting about the airbox smart...
My plan at the moment is to take the airbox into work and laser cut out an exactly symmetrical shape of the carb openings, then reverse them and re
glue them in place and use silicon to seal any other big gaps.
Then perhaps use an MNR scoop or similar to give clearance for the top of the airbox. Definitely don't want a huge box stuck out of the top of
the bonnet...
Any comments?
Chris.
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dern
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| posted on 19/2/06 at 04:06 PM |
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I'm going for an airbox if I can find one simply because of the noise aspect.
I don't believe that the argument that the manufacturers made the optimum solution in the airbox because imo they made the optimum design given
the space restrictions of the bike. Therefore I don't think you can say that it can't be improved on.
Regards,
Mark
R1 (2003 FI) powered Locost in progress
Fireblade/Impreza
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smart51
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| posted on 20/2/06 at 01:11 PM |
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Here's a question. If manufacturers spend millions to get the best possible solution, how come you can get more power than the stock set up when
using presumably inferior aftermarket parts like a foam filter and kit car exhaust?
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gttman
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| posted on 20/2/06 at 01:29 PM |
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probably because the originals are designed to actually keep the noise down.... wereas these aftermarket parts can't even get you on most tracks
let alone through SVA.
how are people justifying gains or losses?
You can very easily gain power and make the engine slower......
10bhp at peak may only be a gain for 1000rpm and a huge loss everywere else, thus be slower on the road. Its the rev range thats important.
I'm using a std airbox with K&N purelly so its quieter..... I can't for one min beleive that its better that a sock etc.. as the air
is sucked from around the engine rather than above it.
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ChrisGamlin
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| posted on 20/2/06 at 06:11 PM |
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The manufacturers part is probably near perfect for what they want it for hence the large cost in developing it, but there's a number of factors
thrown into that pot which means its not usually perfect for outright performance, its usually a compromise of good performance with good noise
suppression, working over a very wide temperature range etc.
[Edited on 20/2/06 by ChrisGamlin]
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ChrisGamlin
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| posted on 20/2/06 at 06:33 PM |
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Having said that, the reason an airbox can be better than an open sock / sausage filter is as Hellfire and GMan have touched on, because of the
quality of air delivered to the carbs / TBs. As well as controlling where the air is picked up (ie making sure its cold), with an airbox you can
control the flow of air towards the throttle openings much better so hopefully providing laminar non turbulent air to the throttle mouths. With an
open sock/sausage filter the filter itself will disturb the air as its sucked into the throttle mouths as well as all the other uncontrolled air
moving about in the engine bay etc, so although there may be more air available in the viscinity, because its turbulent less of it will flow into the
throttle mouths.
I currently run a sock filter as the stock R1 airbox would block my forward vision, but will hopefully be fitting an aftermarket airbox that someone I
know is developing both to reduce noise and provide better quality airflow to the engine.
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smart51
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| posted on 20/2/06 at 07:09 PM |
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So you know of someone developing an R1 airbox that will fit under a bonnet? Do tell.
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ChrisGamlin
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| posted on 20/2/06 at 07:22 PM |
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Not for me no, even if it sat flat on the throttle bodies it still wouldnt go under my bonnet
Im not sure of dimensions yet but hopefully it will be shallower than the stock airbox - I'll let you know more info when I have it.
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Winston Todge
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| posted on 21/2/06 at 10:00 PM |
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I'd certainly be interested too Chris!
Keep in touch.
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