[Discussion] Technical - Air Filter

[Guest FireSpitter]

is it to make the rate of combustion faster? instead of 12.5:1 now at the same given amt of time, it takes in 25:2 or 50:4(ratio same but more combustion?)?

 

There is no difference between 12.5:1, 25:2 and 50:4.

[STORM]

I got a 2nd hand knn filter for s4vtec use for ard 20000km. selling for $30 interested pm me

thanks

[E-DEAD]

I got a 2nd hand knn filter for s4vtec use for ard 20000km. selling for $30 interested pm me

thanks

 

can ver "S" fit if can PM "reaper_y"

[STORM]

 

can ver "S" fit if can PM "reaper_y"

 

I m not to sure.have to ask ard first

[joekia]

I wan..! I wan..!

 

But plan to fit together with a hi-flow aftermarket exhaust. Maybe mid next year.

 

i'm bloody envious of ur country....

[Guest Tird Kenobi]

 

There is no difference between 12.5:1, 25:2 and 50:4.

 

yar those particular magical figures r chosen for one apparent reason that there is no difference. what's your pt?

 

If 1 person can eat 12.5 watermelons in 5mins, then 4 pple can eat 50 watermelons in 5mins. The ratio is the same, 1 person still got to eat 12.5, but in the span of 5 mins, 50 watermelons were consumed instead of 12.5. This is wat I was asking.

 

 

compression ratio and air/fuel ratio are not the same thing..

 

wat i mention was compression ratio? il4 says it's diff, i supposed it's different, y would anyone name a fruit as apple and orange at the same time..

but it wasn't my intention to bring in compression ratio because i dun even know the technicality of it. basically i just asking abt the airfliter only..

 

wat i thought was allow more air in order to allow more petrol to mix, but i not sure so i ask.

[chaicka]

il4 wrote:

if after having more airflows lean up the air fuel ratio from pilot circuit to needle all the way to main jet, how ar? still horse power gain?

 

anyway free flow also means a dip in air pressure.....if u know how carburator work, u probably can figure out wats gonna happen and wat need to be done to correct it

 

 

 

 

 

This is something that is still puzzling me. Is the K&N a fit and go thingy or rejetting is really needed? If more airflow is is created, wont the air fuel ratio be more lean as stated by il4? I had ask a couple of local motorshop b4 regarding this issue, they claimed no rejetting is needed after installing a K&N. IMO, I think rejetting is needed to obtain the correct air fuel ratio because the bike is running more lean now. Who's right, whose wrong? Any advice and comments?

 

Hmmmm...I am not sure what does the jetting here means, but I do know that changing to K&N Air Filter, you will need to do a re-tuning. Retuning would already show performance improvement.

 

To optimize the performance gain, a change of jets are definitely recommended but not necessary.

[slowrider]

 

I studied commerce back then.....boohooohoo, u seems very interested in my past...

 

hows ya wife....

 

seriously dude, would u love to meet me up for coffee or something, ya one interesting character..

 

Coffee? Sure, but you have to take a number as there is a queue in front. A line of chicks has already formed up! I guess you kinda assume that 'me got wife' sort of guy.

 

Never assume the obvious!

[Speedlead]

HI, how u guys who have installed the KNN find it? Cos I rode my fren's VTEC 1 with KNN, I feel like the engine n throttle response quite rough leh although feels like got improve some power. Anyone feel so? Is it supposed to be like that or u can tune it to be smooth like the stock one.

 

Is it even when u change to KNN, the air/oil ratio is still the same or the the ratio change to more air less fuel? If so shld we tune the air flow smaller to maintain the "desired" mixture ratio so as to achieve the smoothness of the engine? Cos i am very puzzled and wondering if i should change to KNN or stay with original.

[BabyVTEC]

seriously i feel no diff in my vtec onli engine roars louder when vtec is activated...LOL..for me onli advantage is no need always buy air filter ..knn can be reuse and reuse..till u think its too old...keke

[slowrider]

 

 

was a simple gesture to be alittle less hostile to u...nvm then

 

its humans to make assumption base on available facts like for example your age displays that you are 40, and hence a NORMAL human will assume that at that age group u probably have a family which is a norm in singapore......

 

unless of course u have something to hide and hence u deliberately to mistate your age to hide the truth fact....

 

 

then again i have to make another assumption coz not many guys here heard or seen or RIDEN a RG125.....and hence this assumption makes good sense that ya 40......

 

asumption assumptions..... :? :?

 

no more coffee for u then.....happy posting

Hmm... sorry that you took it as hostile, wanted it to appear as a joke to you. Guess you got trickle at the wrong spot.

 

The facts are right but your assumptions are wrong, but it is normal as you say to think along such lines.

 

Actually hor, still got many baby RGs around just that they are being swarmed by the newer bikes and therefore does not appear to be seen much.

 

Don't worry, I got this feeling that someday we will sure meet up one!

[Guest BoBOKik]

Hmm... sorry that you took it as hostile, wanted it to appear as a joke to you. Guess you got trickle at the wrong spot.

 

The facts are right but your assumptions are wrong, but it is normal as you say to think along such lines.

 

Actually hor, still got many baby RGs around just that they are being swarmed by the newer bikes and therefore does not appear to be seen much.

 

Don't worry, I got this feeling that someday we will sure meet up one!

 

well nvr assume.. heard its frm somewhere, the spellin for ASS_U_ME means "u make an ASS out of U and ME.. "

 

eh.. il4 come on.. dont be so harsh..

[Kaizer]

[larry]

so where is the recommened place to buy the KNN filter for Version S.

maybe roughly the price ??

[chaicka]

so where is the recommened place to buy the KNN filter for Version S.

maybe roughly the price ??

 

 

HKL quoted $75...

[chaicka]

SRP = S$89

 

If MotorX is to bring it in, would you guys be interested?

 

Both K&N Oil and Air Filters

 

 

http://www.singaporebikes.com/forum/viewto...pic.php?t=19676

[marvypower]

so where is the recommened place to buy the KNN filter for Version S.

maybe roughly the price ??

 

so anyone knows if K&N filter for Vtech can fix on VerS anot?

[Marker]

 

so anyone knows if K&N filter for Vtech can fix on VerS anot?

 

think cannot be use on VS, two diff shape if i not wrong!!!

[chaicka]

 

think cannot be use on VS, two diff shape if i not wrong!!!

 

Yup....those for Ver.S is different from those for Vtec and Spec II.

[stanboy]

hw abt ver. R???is there a fit n go K&N filter 4 it???

[Tai]

Re : K & N air filter

 

Any one here put K&N air filter? Wats the pros? any cons? any regrets? any place to recommend for cheap installation if this air filter is good? My S4's original air filter lasted me 10k liao, do u all tink its time to change?

[merz65]

me used my k&n air filter for over 15000km liao.. just wash n clean it yesterday.. then when i ride feel a diff again.. think e dirt in it had affect e performance.. good buy.. cos can reuse recharge kit cos $18 fro lab, can clean n oil it many times.. good buy.. better response for ur bike too.. friend bought fro LAB at $60.. DIY.. wun regret one..

[Tai]

buy from LAB den DIY? i dunnoe how to fix in leh.. teach? so do i change now or after somemore mileage? juz clocked 10k since 1st day i buy.

[merz65]

depends on urself lor.. if u think its time to change then change lor.. actually s'pore rd not so dusty wouldn't make a very clog in ur filter. but me happen to have a friend who use his stock filter for many yrs. one night we went kulai he can onli hit 100 wif his Project big1.. think now he change filter liao.. got a hp back..

tank easy to remove la.. i remove it alone.. at midnight some more..

[smokin]

buy from LAB den DIY? i dunnoe how to fix in leh.. teach? so do i change now or after somemore mileage? juz clocked 10k since 1st day i buy.

 

if u are riding a ver s, take out the left side cover, u can see the air filter. take out and replace. it's much easier then to replace a vtec one.

alternatively, u may wanna go to mah motorparts and replace it, they can fix u for u.