Sebastian
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| posted on 4/7/07 at 04:11 PM |
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ZX-9R Airbox or Foam filter?
As many builders i also have the problem of little space under the bonnet for the original airbox, i don't mind cutting a hole in the bonnet but
i would like to reduce that to a minimum.
So what i would like to know is what the effect is if i change it for a Foam Filter unit, do i need to rejet the Carbs or do i need new needles etc
etc.
Cheers,
Sebastian.
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worX
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| posted on 4/7/07 at 04:16 PM |
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I'm sure I'll be corrected if I'm wrong, but I think if you fit an aftermarket air filter then you are introducing more air into you
sytem, you then have to match that boost in air with a boost in fuel, which is often done by fitting an aftermarket Jetting kit (jets AND needles in
my Blade case!)
hth
Steve
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awinter
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| posted on 4/7/07 at 05:00 PM |
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Airbox
You cna modify the aribox to turn it through 180 degrees. Less sticks out through the bonnet them. This can help reduce noise and keeps the carbs out
of the airflow. There maybe power gains to be had from a foam filter on rolling road but an exposed filter sticking through a bonnet may not be the
best place to be to get a smooth flow of air into the carbs.
Allan
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badding
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| posted on 4/7/07 at 09:02 PM |
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I have build my own airbox out off polyester.I first wanted to use a faom filter, but the disadantage of a foamfilter, is that it sucks itself full
with petrol and leaves a nasty petrol smell when youre driving the car...
 
Rescued attachment CIMG1931.jpg
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birt
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| posted on 5/7/07 at 09:50 AM |
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You should really get the carb’s jetted anyway since your exhaust system will be different from the bike. If you do use a foam filter then you should
definitely get them jetted, when I turned up at the rolling road (with ZX9R + foam filter) my engine was running lean and hence the first power run
gave me a corrected figure of only 103BHP. After jetting and tweaking, I came out with a corrected figure of 161BHP. I thought it was quick before
hand, it felt like a rocket afterwards.
If you fit a foam filter it will be much louder but if you’re not concerned about that then go with whatever is most convenient. There is a lot of
disagreement on which is the best solution but in my case the airbox would have been a nightmare to package and required a bloody ugly hole or bulge.
I can say that if you go with the foam filter and get it set-up correctly you won’t be disappointed with the performance. It will be very fast, I
guarantee it.
Marc
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Winston Todge
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| posted on 5/7/07 at 11:39 AM |
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Sweet airbox Badding!
How you make it out of polyester?
Chris.
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badding
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| posted on 5/7/07 at 01:11 PM |
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First I made a mould out of thin 0,5 mm Alu together with some wood.
Waxed the mould 4 times with releasewax
Then I applied a layer of topcoat with a paintbrush...waited 4 hours.
Then I applied layers off glassfibre with polyester resin.
Let it dry for 2 days and gently pull the polyster out of the mould.
Made an Alu frame on top to screw the Alu lid on.
The connection to the filter is a piece off Alu pipe, bought at a shop.
I think it´s a standard pipe for a kitchen to connect the fume huud.
Paint and finished...
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roadrunner
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| posted on 7/7/07 at 06:08 PM |
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My zx9r is fitted with a foam filter, and the carbs have been rejetted, when trying to set off with a bit of urgency, the engine bogs down a bit, also
it struggles to pull through 4500-5000 revs, i was going to refit the original jets, but now i am un-sure, what would you fellas do.
Thanks Brad.
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mistergrumpy
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| posted on 7/7/07 at 06:14 PM |
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This is a good thread that might help. Was reading it again
the day before last. Hope it helps a bit 
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roadrunner
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| posted on 7/7/07 at 07:36 PM |
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Thanks mistergrumpy, i know mine has'nt been fitted with a dynojet kit, but has been rejetted, so from the link provided, it sounds like i need
to block of this main air jet thingy, HHMMM. I will look into it.
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mistergrumpy
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| posted on 7/7/07 at 07:48 PM |
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Yep, sounds like it. I take it you took it to someone to do then and they just replaced the jets. Do you know what size you have in at the moment? I
have all this to look forward to soon 
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roadrunner
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| posted on 7/7/07 at 08:15 PM |
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Alas , no , i bought the engine, it had to sets of carbs, the set from the engine was slightly damaged, the other had the new jets fitted, ready for
the car instalation, but what size they, i dont have a clue. The car goes like stink though, apart from said problems.
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mistergrumpy
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| posted on 7/7/07 at 08:18 PM |
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I believe the size should be etched on the jets and the standard is about 155 which is 1.55mm I think. Be interested to know what you have though if
you do get a look.
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roadrunner
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| posted on 7/7/07 at 09:29 PM |
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I will be having a look, because i might be trying the original jets, just to see.
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