why is it that the larger the filter, the better the air flow? also, with all the different designs on the market, do they actually serve a functional purpose? i like the K&N cone i have...and then i look at my friend's dinky ractive one with heat shield. the filter is SO SMALL! it's pretty much half the size of what i have! and then HKS has the sponge one...
On 2002-04-21 02:21, Shaun wrote:
why is it that the larger the filter, the better the air flow? also, with all the different designs on the market, do they actually serve a functional purpose? i like the K&N cone i have...and then i look at my friend's dinky ractive one with heat shield. the filter is SO SMALL! it's pretty much half the size of what i have! and then HKS has the sponge one...
Well, for one, the larger the filter, there is more space for air to travel through. It doesn't seem so, because one may think that ENOUGH air can go through even a tiny hole, but air does take up space. Think of it as pouring water from a bottle... the larger the spout, the more water will pour and the faster.
One thing to remember when asking if the different cone filters serve a functional purpose, they are for looks also. They all basically try and do the same thing; filter in as much as air possible, as fast as possible. To bring in more air, the surface area of the filter just has to be larger. That is why cones are better than the stock filters (which are just flat, instead of curved).
The K&N looks different from both the HKS and the Ractive... because it is their style and nothing more. K&N and HKS probably bring in as much air as the other, but have different styles, different paths that the air takes to get past the filter element. Don't forget that fatter intake tubes also count!
Regarding the Ractive intake with the heatshield... that is designed for a purpose also, despite the fact that it is dinkier! Obviously, you know the colder the air, the better it mixes and combusts with the gasonline, right? So the heat shield tries to keep the air as cold as possible, by blocking air that is heated by the engine, without actually being a cold-air intake. A cold air intake would require longer and more complicated piping, and would require the cone filter to be placed somewhere else in the engine bay, possible near a wheel well (not to mention the possible need for a bypass valve). With the K&N and the HKS cone filters, there is no heat shield, so the air comes from all around, possibly being heated by the engine block.
The K&N and HKS are ideal for cold-air intakes, but the Ractive is more favourable for short intakes, as it sort of acts like a cold air intake. So it's up to you really, K&N and HKS have no heat shields, but more surface area = more air, but warmer. And the Ractive has a heat shield, but less surface area = less air, but colder. Or you could just consider the styles!
However, you could create an ultimate short ram intake by putting an airbox around that K&N filter that you have to create the ultimate air filter!
I was thinking of using one of those cylinder head breathers as the air filter for the scooter...but then it would require rejetting of the stupid carb...so I don't want to do that yet...i'm still trying to fix the tranny problem (belt slipping) but my speedo says I can do 85km/h now.
__________________
Don't know, don't care, everyone is entitled to my opinion.
Lowering your car is hazardous to your health -Toyota 4Runner
On 2002-04-21 02:21, Shaun wrote:
why is it that the larger the filter, the better the air flow? also, with all the different designs on the market, do they actually serve a functional purpose? i like the K&N cone i have...and then i look at my friend's dinky ractive one with heat shield. the filter is SO SMALL! it's pretty much half the size of what i have! and then HKS has the sponge one...
Well, for one, the larger the filter, there is more space for air to travel through. It doesn't seem so, because one may think that ENOUGH air can go through even a tiny hole, but air does take up space. Think of it as pouring water from a bottle... the larger the spout, the more water will pour and the faster.
One thing to remember when asking if the different cone filters serve a functional purpose, they are for looks also. They all basically try and do the same thing; filter in as much as air possible, as fast as possible. To bring in more air, the surface area of the filter just has to be larger. That is why cones are better than the stock filters (which are just flat, instead of curved).
The K&N looks different from both the HKS and the Ractive... because it is their style and nothing more. K&N and HKS probably bring in as much air as the other, but have different styles, different paths that the air takes to get past the filter element. Don't forget that fatter intake tubes also count!
Regarding the Ractive intake with the heatshield... that is designed for a purpose also, despite the fact that it is dinkier! Obviously, you know the colder the air, the better it mixes and combusts with the gasonline, right? So the heat shield tries to keep the air as cold as possible, by blocking air that is heated by the engine, without actually being a cold-air intake. A cold air intake would require longer and more complicated piping, and would require the cone filter to be placed somewhere else in the engine bay, possible near a wheel well (not to mention the possible need for a bypass valve). With the K&N and the HKS cone filters, there is no heat shield, so the air comes from all around, possibly being heated by the engine block.
The K&N and HKS are ideal for cold-air intakes, but the Ractive is more favourable for short intakes, as it sort of acts like a cold air intake. So it's up to you really, K&N and HKS have no heat shields, but more surface area = more air, but warmer. And the Ractive has a heat shield, but less surface area = less air, but colder. Or you could just consider the styles!
Are you f**king insane? How can you even begin to compare Reactive with the likes of K&N and HKS?
The K&N is made up of cotton and is oiled and therefore is the only filter that should be used for cold air intakes, the HKS filters are sh*t they suck alot of air in but filter dick all, plus its made out of sponge and as far as I know sponge seems to absorb water not repel it, while the K&N's mixture of cotton and oil will not allow water to penetrate. Reactive will do dick all exept make more noise, I'd rather keep the stock air box than use the reactive filter, if you wanna use the HKS as a cold air intake filter good luck to you with all that. Just remeber water doesnt compress.
As an owner of a Ractive Heat Shield filter with a small little filter, I can truly say that they suck big time. No performance whatsoever, they only had a deep growl at WOT.
Nice looking, but stay away from them. You can get K&N for almost the same price here in Toronto.
K&N, bench standard in non restrictive intakes, cotton gauze material, between an accordian mesh pattern. Why is the mesh bent like this? becuase it is structually rigid and won't crush all over itself when used in a forced induction application. it also increases surface area, which gives it lots of square centimeters of oiled cotton for dirt to stick to.
The cotton is oiled and this helps attract alot of dust and finer particles and encourages it to STICK to the filter element.
Pros: Reuseable, filters better, less restrictive.
cons: none
HKS: sponge filter element sandwhiched between mesh, but in a mushroom looking cage. The sponge is also oiled. Because sponge doesn't absorb oil (not a fiberous material, unlike cotton) there have been cases of the oil wicking off the filter under boost applictaions and getting oil onto MAP sensors.
Pros: look cool
Cons: Not reusable, don't filter very well.
Ractive filters have 2 lines and they have knock offs of both filter styles, the traditional K&N cone and the HKS sponge mushroom.
GUYS (ESP DAKS), filters are not some breakthrough technology or something, they are simple in design. and the cotton they use is just as good as anyone elses..their sponge are the same grade as others.
The only thing that the ractive filters i have noticed they don't have is a funnel design on the inside of the filter along the collar of it where it attaches to the pipe, instead it has a sharp corner..
filters range in many diff designs and filtering elements, but when it comes down to it, you could put a sock (or pantyhose) and it would still do a pretty ok job.
__________________
siu-sum loy-yun
nothing is forever æ92.FF.pilot
On 2002-04-21 13:05, Silver Streak wrote:
As an owner of a Ractive Heat Shield filter with a small little filter, I can truly say that they suck big time. No performance whatsoever, they only had a deep growl at WOT.
Nice looking, but stay away from them. You can get K&N for almost the same price here in Toronto.
i can't imagine being stuffed into a cramped engine bay be ideal for the filter, esp considering its small size, but don't expect miricles if you changed to a K&N or anything else..
the ractive will probably still be just as equal an improvement as anything else, over stock.
__________________
siu-sum loy-yun
nothing is forever æ92.FF.pilot
Borrowed the MR2's filter and put it on the GTS so I'm just using a white sock pulled over the intake pipe right now while my MR2 is sitting in storage in my garage. It's held on by a hose clamp too.
On 2002-04-21 12:36, Shaun wrote:
heh ok thanks for the info guys.
derek: it can do 85kmph with the BELT SLIPPING NOW?! that's quite impressive!!
Yeah...the aftermarket variator helped top speed but caused the belt to slip...only at accelleration though...it is because it hasn't been worn in properly yet (it would be another 160km). Then top speed and accelleration numbers would improve to it's true numbers- so expect an INCREASE!
__________________
Don't know, don't care, everyone is entitled to my opinion.
Lowering your car is hazardous to your health -Toyota 4Runner
You forgot to mention of king of filters, the Apex'i stainless reusable filter that filters and flows as well as K&N, and you never have to relube it. unfortunately it's like $90.
On 2002-04-21 19:58, F1 Chris wrote:
You forgot to mention of king of filters, the Apex'i stainless reusable filter that filters and flows as well as K&N, and you never have to relube it. unfortunately it's like $90.
yah i hardly see that anywhere and on any vehicle.. i knew it was expensive tho
sard has a nice one too.
__________________
siu-sum loy-yun
nothing is forever æ92.FF.pilot
The AutoGuide.com network consists of the largest network of enthusiast-owned enthusiast-operated automotive communities.
AutoGuide.com provides the latest car reviews, auto show coverage, new car prices, and automotive news. The AutoGuide network operates more than 100 automotive forums where our users consult peers for shopping information and advice, and share opinions as a community.
ToyotaNation.com is an independent Toyota/Lexus enthusiast website. ToyotaNation.com is not sponsored by or in any way affiliated with Toyota Motor Sales, USA, Inc. The Toyota, Lexus and Scion names and logos are trademarks owned by Toyota Motor Sales, USA, Inc.
Linear Mode
