Which induction for power?
Moorron - 24/4/12 at 08:23 PM
Hi guys ive got little work to do on the car so i thought i better come up with something to keep me out of trouble inside the house.
I currently have a ZX12 power Mk Indy using a ITG filter that drops right ontop of the trumpets, its a tight fit and the bonet sits on top of it. It
gets its air from the standard MK Indy bonnet vent. Will it be any better if i go about making a Large alloy airbox for the top of the engine and run
an inline filter from a pipe running from just above the radiator? So the air will enter the nose cone and anything that doesnt go into the rad goes
up into this duct.
Will this be worth it or might it make the engine run hotter with the cold feed stealing air from the rad?
If not then im off to see if my hand can be nailed to the side of my head.
yellowcab - 24/4/12 at 09:15 PM
Hi there,
I'm in the process of making an alloy airbox for my Busa powered MK Indy, but that's purely to reduce the induction noise for when on the
track...
Any airbox will reduce the amount of warm air intake slightly due to the ducting that you speak of only having cold air enter it, but I think the
power increase (if any) would be negligible...
Providing your car isn't an Indy R, and you have exposed side bits either side of the nose cone, then the ducting could sit down there...
If it earns you brownie points and pocket money from the wife, for spending time 'indoors' then do it anyway lol
Take care, Olz
[Edited on 24/4/12 by yellowcab]
twybrow - 24/4/12 at 09:36 PM
I have a mould to suit my zx12 lump... It makes a 2 part box, that fits under my bonnet....
kjouk - 24/4/12 at 10:11 PM
A while back some dyno testing indicated airbox is the way to go for more power vs an open filter on westy. No reasoning on why but my understanding
is that it's likely as much about air velocity as it is temperature.
matt_gsxr - 25/4/12 at 03:54 AM
forced
HowardB - 25/4/12 at 05:46 AM
quote:
Originally posted by matt_gsxr
forced
+1
jeffw - 25/4/12 at 06:53 AM
The major bike manufactures spend a fortune designing airboxes to maximise the power from their engines. You would be wise to adapt the stock box if
you can.
Steve Hignett - 25/4/12 at 07:27 AM
Hi there,
I'm working through my garage at the moment, sorting out stuff that I can sell to raise money for a car.
I found two things which could perhaps be of interest.
The first is a 2 part airbox mould, the same mould was used to make the airbox in this video; http://www.youtube.com/watch?v=oiqZE3-LDIg
The second is a good sized Pipercross Filter, unused and a (Blank) carbon Fibre backing plate...
Both will be for sale very shortly and for a good price, and I can get photo's of both if you wish.
Or if anyone else is interested, then please get in touch via U2U..
Cheers,
Steve
BobM - 25/4/12 at 01:03 PM
quote:
Originally posted by jeffw
The major bike manufactures spend a fortune designing airboxes to maximise the power from their engines.
With respect, no they don't. They spend a fortune compromising their airbox so it'll fit under/within a standard motorcycle tank losing as
little performance as possible in the meantime.
Nick DV - 25/4/12 at 01:09 PM
quote:
Originally posted by jeffw
The major bike manufactures spend a fortune designing airboxes to maximise the power from their engines. You would be wise to adapt the stock box if
you can.
+1
Cheers, Nick 
Nick DV - 25/4/12 at 01:11 PM
quote:
Originally posted by BobM
quote:
Originally posted by jeffw
The major bike manufactures spend a fortune designing airboxes to maximise the power from their engines.
With respect, no they don't. They spend a fortune compromising their airbox so it'll fit under/within a standard motorcycle tank losing as
little performance as possible in the meantime.
That is also true, but the bike box, if it can be adapted to fit, is pretty close to what you need.
Cheers, Nick
theduck - 25/4/12 at 01:30 PM
Cut a hole in the side of the bonnet and add another scoop directly online with the filter?
BobM - 25/4/12 at 01:48 PM
quote:
Originally posted by Nick DV
That is also true, but the bike box, if it can be adapted to fit, is pretty close to what you need.
Agreed, and certainly better that an open sausage filter, especially if you can duct cool air to it.
Nick DV - 25/4/12 at 01:53 PM
quote:
Originally posted by BobM
Agreed, and certainly better that an open sausage filter, especially if you can duct cool air to it.
True again, and of course the massive reduction of induction noise.
Cheers, Nick
yellowcab - 25/4/12 at 01:58 PM
I'm leaving one end of my airbox open, as it sits directly behind the bonnet vent :-)
jeffw - 25/4/12 at 02:30 PM
quote:
Originally posted by BobM
quote:
Originally posted by jeffw
The major bike manufactures spend a fortune designing airboxes to maximise the power from their engines.
With respect, no they don't. They spend a fortune compromising their airbox so it'll fit under/within a standard motorcycle tank losing as
little performance as possible in the meantime.
I'm sure you are correct and that it would be possible to build a better airbox than the stock bike one but I certainly wouldn't have the
technical know how and R&D budget to do better than the factory, compromised or not. I seriously doubt anyone in our little cottage industry
could do better either but I'm prepared to be proved wrong.
Nick DV - 25/4/12 at 02:34 PM
quote:
Originally posted by yellowcab
I'm leaving one end of my airbox open, as it sits directly behind the bonnet vent :-)
Get a filter in there before the airbox or you will still have too much induction noise for trackdays etc.
Cheers, Nick
yellowcab - 25/4/12 at 02:44 PM
Good shout!
My intention was to put some air filter foam on the back of my bonnet scoop enterence, so only filtered air could pass through into the box...
BobM - 25/4/12 at 06:22 PM
quote:
Originally posted by jeffwI'm sure you are correct and that it would be possible to build a better airbox than the stock bike one
but I certainly wouldn't have the technical know how and R&D budget to do better than the factory, compromised or not. I seriously doubt
anyone in our little cottage industry could do better either but I'm prepared to be proved wrong.
My understanding is that ideally you want:
1. A large volume - GSXR1000 airbox is 8.5 litres
2. A shape that encourages the air flow to slow down and smooth out as it approaches the trumpets
3. Nice smooth inner surfaces
4. Positive pressure (i.e. ram air)
There are then other issues like pressure wave pulses that are obviously way beyond us mere mortals.