Sterling

This is to generate a discussion about air filters. I'd like to know not just what brand, but what size filters people are using on every design intake...modded, stock, stock with holes cut in the canister...whatever!

I have a Yaw carb that I've played around with for about a year. I've done some other things to it myself, and man- oh- man does she scream! When I compare it to a stock rebuilt that I have'nt modded, but am testing and tuning (I swap carbs alot) It just friggin screams! I truely believed it was the best it could get. I had finally "got it right"...the long hours of tuning had finally paid off. (Of course now I'm going to go the supercharger route after all that ****!)

This weekend I did something I had never done before. I did a run with no filter at all. The difference was very noticeable.

On my Yaw I have a 6 inch by 3 inch filter. I kinda figured that it would just mean I would have to change it more often.
I figured friggin wrong! There just does'nt seem to be enough area in the filter from which the carb can draw.

Yet what puzzels me is that I see these photos of Webers and such with tiny little air elements on them.
Are they just as inhibited? Or is the Wix that I use too good...so good to point that my engine is trying to breathe thru a pillow?

I could just get a larger diameter filter, and some fancy work with a stainless steel mixing bowl and a hacksaw (That's right...I said it! Pppft - Noone will know!),
But I prefer to keep my smaller filter.

Whoever runs one of these, what brand do you use and what carb is it on?

hanman

Hey sterling,
It's the old man again! I am still scheming on how to get you for that statement on mazspeed, lol!
Anyway, I have the same carb setup, I just bought a K&N, but havent' put it on yet. I don't have my Yaw dialed in perfectly yet. I keep ya posted.
hanman

Pele

iTrader: (28)

A fairly dirty Fram is on mine...

Mice have probably eaten it and made a nest in my air box by now... Unless the carb preheat valve kept them out.

crankit

Be Smart and put a K&N filter on. One of the few that actually lets you feel the difference. #1 in my book Also they are reuseable.

Pele

iTrader: (28)

I heard you can't feel the difference between the K&N and a paper type. That and they don't filter as well as a paper filter.

theNeanderthol

iTrader: (1)

I felt the difference with my k&n filter seems to filter well also carb looks nice and clean since i put it on

smnc

I have a K&N Stock Replacement. It came with the car, so I can't really judge a difference.

What I wanna do is get a nice cold-air setup with a cone filter.

Does anyone know if there is a kit out there, or am I stuck making my own?

peejay

I can't feel the difference between a K&N and a regular air filter. Hmm. I used to use the filters designed for early 70's Mopars with 318 2bbls. They're the same exact size as the Mazda filter but they have fewer pleats, so the air goes through the element straighter instead of at a steeper angle... Probably doesn't make a difference, but the Mopar filter is usually a buck or two cheaper

One nice thing about K&Ns is that you don't throw them away. $70 for a K&N vs. $12 for a paper filter, though, means you better have that thing for a long time before it pays off. BTW how much does a recharger kit cost, and how many cleanings does it last?

crankit

K&N filters run around 40-50 bucks. You just have to shop around. Summit Racing is usually low priced.

REVHED

The recharger kit was about $15 bucks. The cleaning solution lasts for about 4-5 cleanings but the oil was only enough for about 3 cleanings at the most.

peejay

Advance Auto wanted $66 for one. My local speed shop (which is now CLOSED due to the owner's havnng back problems He says they'll re-open in 6-9 months) also said about $60.

I'm only 40mi from Summit's main store, but the customer "service" there is atrocious. I prefer getting stuff from my speed shop, but some things he doesn't carry because there's no way he could be competitive in price. (So I had to go to Summit for my helmet. Summit SUCKS!!!)

BadAssRX-7

i have a stock filter thinggy from racing beat 4 sale with 2 filters this is about 80 new and other than 1 dirty filter its in new shape. 50 plus shipping and its your. im going r.e. dcd webers
pm me if your intrested

Jeff20B

iTrader: (13)

I use Fram and the stock dealer style metal filters. It's like breathing through emphysema.

MIKE-P-28

iTrader: (1)

I have a Power Pulse breather assembly and a K and N thats up for sale. The breather assembly needs to be painted, but is in great shape. Its the same one as on the racing beat site for 50 for the breather and 44 for the filter. The cleaner is available at advance auto or autozone. I could tell a difference in this set up also you can hear it sucking the air in there

peejay

Big Fat Cork: Why have a bunch of little corks when you can have just one big one?

Hmm, maybe is time I take some nap, yes yes....

- PJ (It was a Saturday Night Live fake commercial, "Big Fat Bean", used during some of their fake TV show skits... nevermind)

theNeanderthol

iTrader: (1)

my stock replacement k&n was $40 from checker auto. By the way, does anyone know anything about the mazda motor sports intake? They said they dynoed it at a 12 hp increase over racingbeats 7 hp. I'm not about to spend $100+ on an intake, but if i saw a picture or a desription i could rig one of my own for cheap.

Winnipeg85GSL

http://www.rx7.com/pics/sa-bonez-intake5.jpg


just cut the rest of the cleaner off and take off the snorkel! Voila!

yayarx7

I bought an Amsoil brand foam filter from RP back in the day and still use it. I think it flows much better. I have seen foam type filters somewhere for the 12a cars. I used to use a custom, open element type, air cleaner, but recently went to a cold air setup drawing from in front of the rad. I think I like the cold air better, but the open element made a hell of a woot at full tilt boogie

iyaseven

k&n, $36, at their 10% off sale. i notice positive power surge pulling up to the redline! sounds like an indian sahdu drawing a deep one on his chillum!












2

iyaseven

bought the k&n at schucks auto. its getting late and the de-tox tea is making me zzz, oh well better get some sleep.

davo22

sterling
i had a freind who ran around without the air filter. He also noted a difference. he noticed differences with everything, so i don't trust him. anyhow you have a pressure drop across the carb venturi's, and the same at the filter element. Remove one and the final pressure drop is less. could calculate the difference but who cares, your car is probably just louder than before. i would challenge whether you gained 2hp, if that. Now damn it stop stalling and get that supercharger in there.
I run a dirty *** K&N style cone filter. webers work best with just some velocity stacks, but well you get dirt in your motor etc. so your carb would work best with just a velocity stack (air horn) but it'll get the motor dirty.

Pele

iTrader: (28)

Maybe I can get more power outta my Honda if I pull the air filter and stretch a shop rag or an old t-shirt over the carb...

Dyno

I wanna see how SDJ, the manufacturer of that "12hp" air cleaner, came up with that number. I can't find it. The thing makes the same hp on a stock motor as the RB one, which makes the same hp as the stock housing with a KN filter. The only way there is 12 hp in there is if the stock housing had a 10 year old paper filter. Maybe 5 hp over a clean paper filter. There is about 4-5 hp hiding in using a 4 inch PVC sewer pipe and a good cone filter, but getting it all to fit is a pain and the PVC starts cracking after it sees enough heat. Good portion of the power increase seems to come from the fact that the air temp going into the fancy motorsport filter is 50 deg F above ambient. A 3inch pipe made the same hp at 7000 rpm, but was down 1-2 hp above and below peak.

Using the big tube is a crap shoot, as you're looking to get lucky and find the right mix between velocity and mass. Every engine and exhaust system is going to need something a little different. Using a big KN style filter with tons of fresh air supplied to it will get the easiest bang for the buck. You can even measure it by running down to Kmarts (if they haven't closed yet), and picking up a $10 car thermometer with the inside and outside readings. Stuff the thermocouple for the outside reading in the air cleaner and go play. Poor man's data acquisition....

piston pounder

Ive got a stock size k&n thats for sale, name a price and ill even clean it for free!

Winnipeg85GSL

10 bucks and you got a deal!