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 Post subject: air filter for carbs
PostPosted: Mon Oct 02, 2006 6:23 am 
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Joined: Fri Mar 19, 2004 5:00 pm
Posts: 268
Location: a liitle village called Gilberdyke
im about to start makin an airbox for my carbs but i aint sure where the best place to mount an air filter would be. will it be best toget a flat filter and place inside the airbox over thecarbs or i was alternativly thinkin to jus get a cone filter and mount behind the bumper withe the air running into the airbox from there. which would be best??

cheers guys
tempo


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PostPosted: Mon Oct 02, 2006 7:05 pm 
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Joined: Thu Apr 15, 2004 12:27 am
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Location: Aruba
Have you looked at this?

http://www.teamswift.net/album_page.php?pic_id=1853

I think it's perfect.

Can't remember which thread it was, but basicly, the bigger the airbox, the better.

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1989-GTi: 3Tech 210/340 Cams,Cultus IM, B&G springs, TD04L turbo, Apexi SAFC, Suzukird UD pulley, Circuitse7en dual boost controller, AEM wideband, AEM water / meth injection kit, HKS bov.
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 Post subject:
PostPosted: Tue Oct 03, 2006 8:37 am 
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Joined: Fri Mar 19, 2004 5:00 pm
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Location: a liitle village called Gilberdyke
thanks for that kidder. this was my other idea but gettin a filter of that style costs a lot. im umming and arring weather to do it or not. thanks tho.

tempo


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PostPosted: Wed Jan 17, 2007 4:59 pm 
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Joined: Sun Jul 24, 2005 7:47 am
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Location: Donemana
What was that made out of????

I see in like deemon Tweeks ect you can buy a box cheap enuf all you gotta do if make an alu plate over you carbs for it to bolt to '

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PostPosted: Fri Jan 19, 2007 3:36 pm 
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Location: bournemouth,england
if ur makin ur own box just remember that the volume of the inlet hose must be equel or larger 2 the max volume of the 4 carb inlets


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PostPosted: Sat Jan 27, 2007 4:10 pm 
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Location: Haarlem @ the Netherlands
dominator wrote:
if ur makin ur own box just remember that the volume of the inlet hose must be equel or larger 2 the max volume of the 4 carb inlets


Why?
I think if you make the inlet the same as the inlet size of 2 carbs (+/-80mm),it would be fine and you have some air speed too!?!?

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PostPosted: Sun Jan 28, 2007 10:06 am 
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well if u fink about it at full throtle all 4 carbs r sukin in 4x40mmdia worth of air in so you have 2 replace it wiv the equil amount of air.
im not sayin that an 80mm duct wouldnt work coz it would and quite well its just that on the road your not at full throtle all the time so you wouldnt need 4x40mm worth of air but say on the track/drag you would.
im not an expert on this so i dont actually no how 2 work it out but im sure my mate at work knows coz he designs the ventilaition systems i make and fit and im sure its pretty much the same theory so i`l have a word wiv him about it.


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PostPosted: Sun Jan 28, 2007 4:40 pm 
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dominator wrote:
well if u fink about it at full throtle all 4 carbs r sukin in 4x40mmdia worth of air in so you have 2 replace it wiv the equil amount of air.
im not sayin that an 80mm duct wouldnt work coz it would and quite well its just that on the road your not at full throtle all the time so you wouldnt need 4x40mm worth of air but say on the track/drag you would.
im not an expert on this so i dont actually no how 2 work it out but im sure my mate at work knows coz he designs the ventilaition systems i make and fit and im sure its pretty much the same theory so i`l have a word wiv him about it.


Yeah,simple......4x40mm=160mm,but the cylinders only needs air pulses,not continu 160mm of air trought the inlet/pipe.
And there is always more air going in to the inlet/pipe than needed,or you are not making a cold air intake,so the air is not automaticly going in the inlet/pipe,but the carbs must suck it in. (no air speed)

But im curius what your friend has to tell about this,becouse i also want to make an airbox,and i am not shore what size to make the airbox and inlet pipe. :wink:
So,ill hope to hear it from you!? :D

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PostPosted: Sun Jan 28, 2007 5:34 pm 
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Location: a liitle village called Gilberdyke
hey there. well my air box was made to exactly 3 litres in volume. im not entirely sure if it was uneven airflow or the lack of volume which made it bog down. atchi aka miniswift told me that the airbox should be the same size or bigger than the origional bike size airbox for the carbs your going to use. im no longer staying with carbs but im willing to give any advise.

tempo


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 Post subject:
PostPosted: Mon Jan 29, 2007 3:07 pm 
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Location: bournemouth,england
Dr.Insane wrote:
dominator wrote:
well if u fink about it at full throtle all 4 carbs r sukin in 4x40mmdia worth of air in so you have 2 replace it wiv the equil amount of air.
im not sayin that an 80mm duct wouldnt work coz it would and quite well its just that on the road your not at full throtle all the time so you wouldnt need 4x40mm worth of air but say on the track/drag you would.
im not an expert on this so i dont actually no how 2 work it out but im sure my mate at work knows coz he designs the ventilaition systems i make and fit and im sure its pretty much the same theory so i`l have a word wiv him about it.


Yeah,simple......4x40mm=160mm,but the cylinders only needs air pulses,not continu 160mm of air trought the inlet/pipe.
And there is always more air going in to the inlet/pipe than needed,or you are not making a cold air intake,so the air is not automaticly going in the inlet/pipe,but the carbs must suck it in. (no air speed)

But im curius what your friend has to tell about this,becouse i also want to make an airbox,and i am not shore what size to make the airbox and inlet pipe. :wink:
So,ill hope to hear it from you!? :D




well 2 b honest im stumpd i asked my mate at work and he started crapin on about cubic feet per min and other types of airflow jargon and i fink it went in 1 ear and out the other he gave me a formula 2 work out the area which then lets u work out the volume and then you can workout the velocity but i dont fink any of it applys 2 this situ and like you say its takin the air in pulses but its still about 27 (6 per cylinder) pulses a second on a std engine at peek revs that is quite alot so im just gona make a box wiv a 140 duct and hope for the best failing that i mite fabricate a box 2 mount on the carbs that could mate up 2 a modified bonet wiv sum sorta air scoop on top.

sorry i couldnt b much help but im all out of ideas and technical nowhow in this department :oops:


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 Post subject:
PostPosted: Tue Jan 30, 2007 12:32 pm 
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Joined: Fri Mar 19, 2004 5:00 pm
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Location: a liitle village called Gilberdyke
if your planning on using a bonnet scoop then i really see no point in using an airbox. just put filters over the carbs and ducting from the bonnet. just my opinion

tempo


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PostPosted: Wed Jan 31, 2007 1:46 pm 
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Joined: Thu Jan 18, 2007 3:06 pm
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Location: bournemouth,england
well i wouldnt relly call it an airbox more of sheild like the boxes you see on wrc cars its just a carbon box wiv a masive air filter in and it mates up 2 a vent in the bonet i guess its there 2 stop the heat dirt and water gettin 2 the filter but im alongway from gettin 2 that stage on my car yet

gary


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