air filter question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mtdave2 · 02-26-2003, 09:22 PM

what air filter do you have? i bought a k&n air filter today, i told the parts guy what truck i had and he brings out this 4 inch filter.
i told him that ist way to tall. he told me, well then you have a 2 barrel car, or someone has messed with your truck. i laughed, and asked to see the 2 bbl one.

that one was the correct size. then i started thinking that i have never seen a truck with the thick airfilter. have you all, or wtf is going on?

mtdave2 · 02-26-2003, 09:27 PM

i guess its more like 3 inches or so on the normal size
the big one is like 5

crazy longhorn · 02-26-2003, 09:56 PM

Dave, you shouldnt smoke so much crack!

(couldnt pass that up)..........To be totally honest, I dont remember what the stock filter looks like

I have a 14x4 K&N in a Moroso "wrap".....crazyL

mtdave2 · 02-26-2003, 10:39 PM

im not sure what the mesurement is, but this is a photo of what i call a normal stock air filter. the one he handed me was almost double the hight.

GMC71k20 · 02-26-2003, 10:55 PM

screw the big ones, buy a cheap small one and get brutally picked on for having a "small one"

69sixpackbee · 02-26-2003, 11:54 PM

I have the best addition to my engine bay....a MOPAR air cleaner!

Mike C · 02-26-2003, 11:54 PM

All of the 67-72 trucks I have seen have something like a 2 1/2" filter, maybe even 2". The bigger ones were usually on trucks in the '80s. My 402 and both of the 350 that had factory air cleaners were same.

Project1970 · 02-26-2003, 11:57 PM

Yup, mine had a small one...

Now it's got a nice tall K&N.

*Gee_Emm* · 02-27-2003, 12:00 AM

I use a 2 inch K&N with a chrome top for driving around and for shows I put the original setup back on. I notice a HUGE difference between the two while driving.

nroden · 02-27-2003, 12:04 AM

I have the stock one as shown in the picture on my 350 then I guy gave me a K&N with Chrome breather but I have never putten it on. My concern has been from people saying that dirt can get in easier with the K&N.... not good for a guy on gravel such as myself. A buddy of mine with a 87, 1 ton, 4wd, with 454 says it has made a difference in his performance by far and he gets another MPG, maybe two.

72CustomCamper · 02-27-2003, 01:24 AM

That black frisbee with the straw attached (original airbox) is what was on my BB when I got it from my grandfather.

The engine would completely cutout at about 3500 rpm due to air starvation.

I replaced it with a plain 3" paper filter on an open chrome plated body and WOW what a difference in power and mpg (must be the chrome).

The only think I don't like about it is the constant hiss of air through the Q-Jet...love that howl from the secondaries though.

The airbox was on the 350 that originally sat in my '72.

mtdave2 · 02-27-2003, 01:28 AM

anyone ever turn the metal top upside down? i used to do that with my old truck.. dont know if it gave more power..

72CustomCamper · 02-27-2003, 01:30 AM

To everyone with the stock nozzle:

Think about the simple physics of your engine,

mass flow rate in must equal mass flow rate out.

The cross sectional AREA of your air intake should be somewhat equal to the area of your exhaust (fuel mass is negligible).

Those factory nozzles are way too restrictive and were the result of strict emission controls, not performance engineering.

UNMASK THOSE CARBS!

mtdave2 · 02-27-2003, 01:47 AM

kn parts numbers.
they show 2.
E-1500 4bbl
e-1450 2 bbl

they one they have as a 2 bbl fits in my stock 4 bbl air cleaner...something is up here

here is the thick one that i have never seen on our trucks...

72 CustomCamper · 02-27-2003, 02:05 AM

Hey mtdave2that last filter you posted looks like the one for my dad's 84 chevy with a 4 bbl. His is almost 5 in tall..

Chuck

ChevLoRay · 02-27-2003, 07:27 AM

....let's see. Someone gave you a K&N and the housing, but you don't know how well it filters and you drive on a gravel road? Have you been living in a tent?

K&N's have an oil-impregnated cotton gauze filter media that they warrant for 1million miles. The service interval is 50K miles. So, what is the question? These filters are designed to provide superior filtration, compared to oil bath, and pleated paper filters. Oil bath filters did the same thing, but had a coarser filter media, were heavy and cumbersome and had to be serviced periodically to keep the media properly oiled. Paper filters were an "improvement" due to the serviceability issues, and they were lighter in weight.

Seems us who were interested in performance didn't like the paper filters, tho. So, the K&N was born. Now, Accel has a clone, as does Summit Racing. I run K&N's on everything except my old Yahama Moto-4, but I'm looking for one for it.

They aren't concours correct, but neither is my truck.

mrein3 · 02-27-2003, 08:27 AM

Quote:

Originally posted by mtdave2
anyone ever turn the metal top upside down? i used to do that with my old truck.. dont know if it gave more power..

Back in high school, in the mid 80's, gulp, a buddy and I both had Chevelles. We would did the metal top upside down thing. It sounds really cool when your tranny kicks down a gear.

smokekiki · 02-27-2003, 09:53 AM

Wish someone would give me one!I am running an accel.It seems to work as good as my k&n.The only reason I went with the accel is because it matches my paint,black and yellow.

sixnine · 02-27-2003, 12:58 PM

I just replaced my filter. I have an aftermarket (cheap) chrome air cleaner. The filter I replaced was about 2" tall. I measured the diameter of the bottom lid and went to the parts store to find the tallest filter that would fit under the hood. (More air flow is NOT a bad thing). I ended up with a 4" tall filter. I flipped the top lid upside down because the carb stud wasn't long enough the "right side up" way. Just my 2 cents.

Lippyp · 02-27-2003, 02:18 PM

I believe that K&N offer two types of extra wrap around pre-filter for off road driving that filters out the bigger particles and gives you some added protection. Try here for further info. http://www.knfilters.com/wraps.htm haven't had the need to use them myself but there may be board members out there who have.

NSANE68!!! · 02-27-2003, 02:26 PM

Here's a pic of the big filter on our trucks.

Slammed67 · 02-27-2003, 02:43 PM

Looks like mine NSANE68!!!.... I think it's a 4"

Earl Junior · 02-27-2003, 03:06 PM

It still doesn't fit unde the hood very well, but I refuse to get a cowl hood.

72CustomCamper · 02-27-2003, 11:31 PM

sixnine-

You can buy a two foot length of the threaded rod for your carb at Home Depot or Lowe's for about a buck or two (its a standard size National Coarse).

Just hack it off at exactly the length you want.

mikep · 02-27-2003, 11:50 PM

Quote:

Originally posted by 72CustomCamper
To everyone with the stock nozzle:

Think about the simple physics of your engine,

mass flow rate in must equal mass flow rate out.

The cross sectional AREA of your air intake should be somewhat equal to the area of your exhaust (fuel mass is negligible).

Those factory nozzles are way too restrictive and were the result of strict emission controls, not performance engineering.

UNMASK THOSE CARBS!

Its just a little thing but while the fuel mass is negligible it does two things in the combustion process that cause the exhaust flow rate to be much higher than the intake flow rate. It gets hot and expands and the liquid gasoline turns into a whole slew of gases during combustion . The simple volume of the exhaust gases is considerably greater than the volume of intake gases. The ports on the exhaust side are smaller than the intake because the exhaust gases are under a lot of pressure as they leave the cylinder and escape into a low pressure environment and do not need the larger ports typical of intake ports and valves.

View Poll Results: what air filter do you have?
i have the normal 2 inch or so high airfilter	12	54.55%
i have that big thick filter that dave has never seen	4	18.18%
you shouldnt smoke soo much crack.	6	27.27%
Voters: 22. You may not vote on this poll

02-26-2003, 09:22 PM	#1
mtdave2 newly minted old timer Join Date: Dec 1999 Location: Hudson WI Posts: 3,508	air filter question what air filter do you have? i bought a k&n air filter today, i told the parts guy what truck i had and he brings out this 4 inch filter. i told him that ist way to tall. he told me, well then you have a 2 barrel car, or someone has messed with your truck. i laughed, and asked to see the 2 bbl one. that one was the correct size. then i started thinking that i have never seen a truck with the thick airfilter. have you all, or wtf is going on? __________________ ____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban Last edited by mtdave2; 02-26-2003 at 09:26 PM.

02-26-2003, 09:27 PM	#2
mtdave2 newly minted old timer Join Date: Dec 1999 Location: Hudson WI Posts: 3,508	i guess its more like 3 inches or so on the normal size the big one is like 5 __________________ ____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban

02-26-2003, 09:56 PM	#3
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,403	Dave, you shouldnt smoke so much crack! (couldnt pass that up)..........To be totally honest, I dont remember what the stock filter looks like I have a 14x4 K&N in a Moroso "wrap".....crazyL __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

02-26-2003, 10:39 PM	#4
mtdave2 newly minted old timer Join Date: Dec 1999 Location: Hudson WI Posts: 3,508	im not sure what the mesurement is, but this is a photo of what i call a normal stock air filter. the one he handed me was almost double the hight. Attached Images __________________ ____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban

02-26-2003, 10:55 PM	#5
GMC71k20 Registered User Join Date: Aug 2002 Location: mass Posts: 1,277	screw the big ones, buy a cheap small one and get brutally picked on for having a "small one" Attached Images

02-26-2003, 11:54 PM	#6
69sixpackbee Registered User Join Date: Jan 2001 Location: Sabinal, Texas Posts: 1,706	I have the best addition to my engine bay....a MOPAR air cleaner!

02-26-2003, 11:54 PM	#7
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,715	All of the 67-72 trucks I have seen have something like a 2 1/2" filter, maybe even 2". The bigger ones were usually on trucks in the '80s. My 402 and both of the 350 that had factory air cleaners were same. __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax

02-26-2003, 11:57 PM	#8
Project1970 14.1 @ 96MPH Join Date: Jul 2001 Location: Mesa, AZ Posts: 2,811	Yup, mine had a small one... Now it's got a nice tall K&N. __________________ Project1970 - LS1 Swap Complete!

02-27-2003, 12:00 AM	#9
Gee_Emm Account Suspended Join Date: Sep 2000 Posts: 4,002	I use a 2 inch K&N with a chrome top for driving around and for shows I put the original setup back on. I notice a HUGE difference between the two while driving.

02-27-2003, 12:04 AM	#10
nroden Registered User Join Date: Jun 2001 Location: Springfield, MO Posts: 1,098	I have the stock one as shown in the picture on my 350 then I guy gave me a K&N with Chrome breather but I have never putten it on. My concern has been from people saying that dirt can get in easier with the K&N.... not good for a guy on gravel such as myself. A buddy of mine with a 87, 1 ton, 4wd, with 454 says it has made a difference in his performance by far and he gets another MPG, maybe two. __________________ Nick Rodenberg 72 Cheyenne 10 V8 350/TH350 white/ochre/white/ochre, ochre/saddle interior Retired and in the dry... still runs. I now drive Red '01 Ford Focus... better MPG!!!

02-27-2003, 01:24 AM	#11
72CustomCamper Registered User Join Date: Feb 2003 Location: Bremerton, WA Posts: 86	That black frisbee with the straw attached (original airbox) is what was on my BB when I got it from my grandfather. The engine would completely cutout at about 3500 rpm due to air starvation. I replaced it with a plain 3" paper filter on an open chrome plated body and WOW what a difference in power and mpg (must be the chrome). The only think I don't like about it is the constant hiss of air through the Q-Jet...love that howl from the secondaries though. The airbox was on the 350 that originally sat in my '72. __________________ '72 GMC C20, "2500 Super Custom", Custom Camper, New 454 '93 K2500 Suburban, Old 454 (157K)

02-27-2003, 01:28 AM	#12
mtdave2 newly minted old timer Join Date: Dec 1999 Location: Hudson WI Posts: 3,508	anyone ever turn the metal top upside down? i used to do that with my old truck.. dont know if it gave more power.. __________________ ____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban

02-27-2003, 01:30 AM	#13
72CustomCamper Registered User Join Date: Feb 2003 Location: Bremerton, WA Posts: 86	To everyone with the stock nozzle: Think about the simple physics of your engine, mass flow rate in must equal mass flow rate out. The cross sectional AREA of your air intake should be somewhat equal to the area of your exhaust (fuel mass is negligible). Those factory nozzles are way too restrictive and were the result of strict emission controls, not performance engineering. UNMASK THOSE CARBS! __________________ '72 GMC C20, "2500 Super Custom", Custom Camper, New 454 '93 K2500 Suburban, Old 454 (157K)

02-27-2003, 01:47 AM	#14
mtdave2 newly minted old timer Join Date: Dec 1999 Location: Hudson WI Posts: 3,508	kn parts numbers. they show 2. E-1500 4bbl e-1450 2 bbl they one they have as a 2 bbl fits in my stock 4 bbl air cleaner...something is up here here is the thick one that i have never seen on our trucks... __________________ ____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban



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02-27-2003, 02:05 AM	#15
72 CustomCamper huh ??? Join Date: Nov 2002 Location: Fredericksburg,Va. Posts: 3,369	Hey mtdave2that last filter you posted looks like the one for my dad's 84 chevy with a 4 bbl. His is almost 5 in tall.. Chuck __________________ 90 Blazer Silverado 350w/ 700R4 and 32" Kelly's "I am a bomb technician. If you see me running try to keep up!"

02-27-2003, 07:27 AM	#16
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	....let's see. Someone gave you a K&N and the housing, but you don't know how well it filters and you drive on a gravel road? Have you been living in a tent? K&N's have an oil-impregnated cotton gauze filter media that they warrant for 1million miles. The service interval is 50K miles. So, what is the question? These filters are designed to provide superior filtration, compared to oil bath, and pleated paper filters. Oil bath filters did the same thing, but had a coarser filter media, were heavy and cumbersome and had to be serviced periodically to keep the media properly oiled. Paper filters were an "improvement" due to the serviceability issues, and they were lighter in weight. Seems us who were interested in performance didn't like the paper filters, tho. So, the K&N was born. Now, Accel has a clone, as does Summit Racing. I run K&N's on everything except my old Yahama Moto-4, but I'm looking for one for it. They aren't concours correct, but neither is my truck. __________________ Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was.

02-27-2003, 09:53 AM	#18
smokekiki Mike Join Date: Jan 2003 Location: west chester pa Posts: 2,474	Wish someone would give me one!I am running an accel.It seems to work as good as my k&n.The only reason I went with the accel is because it matches my paint,black and yellow. __________________ 70'c/10, 71 suburban4x4 402bb, 72suburban 4/6 drop, 72k/5 4x4 blazer 4" lift 35 tires

02-27-2003, 12:58 PM	#19
sixnine Longtime Member Join Date: Oct 2002 Location: Over Yonder (DFW) Posts: 171	I just replaced my filter. I have an aftermarket (cheap) chrome air cleaner. The filter I replaced was about 2" tall. I measured the diameter of the bottom lid and went to the parts store to find the tallest filter that would fit under the hood. (More air flow is NOT a bad thing). I ended up with a 4" tall filter. I flipped the top lid upside down because the carb stud wasn't long enough the "right side up" way. Just my 2 cents. __________________ Rokcrln - *"I'm a major car addict so trying to go as low buck as possible is like asking a coke head to use flower to save money."* 1972 C10 Short Step -http://67-72chevytrucks.com/vboard/s...d.php?t=261405

02-27-2003, 02:18 PM	#20
Lippyp English Chevy Owner Join Date: May 2002 Location: Shropshire, UK/ Lot, France Posts: 1,848	I believe that K&N offer two types of extra wrap around pre-filter for off road driving that filters out the bigger particles and gives you some added protection. Try here for further info. http://www.knfilters.com/wraps.htm haven't had the need to use them myself but there may be board members out there who have. __________________ Phil '67 C10 long fleet. 350/TH350, 4 bbl Carter, K&N, Dual exhaust, loads of stuff coming soon 2001 S10 Blazer Daily Driver, bone stock 4 door 4x4 with manual transmission

02-27-2003, 02:26 PM	#21
NSANE68!!! SLICER AND DICIER Join Date: May 2001 Location: Quuen Creek Posts: 1,383	Here's a pic of the big filter on our trucks. Attached Images __________________ 01 Tahoe 22's 2/4 drop and tv's 68 chevy money pit 51 chevy belair 95 Honda 900RR 05 GMC Siearra (company truck)

02-27-2003, 02:43 PM	#22
Slammed67 Progress = 0% Join Date: Nov 2001 Location: Kansas City, MO Posts: 2,108	Looks like mine NSANE68!!!.... I think it's a 4" __________________ Jason - '67 GMC swb \| '57 Bel-Air 4dr hardtop \| '56 210 4dr Wagon \| 2000 GMC Sierra

02-27-2003, 03:06 PM	#23
Earl Junior Cadillac power Join Date: Oct 2002 Location: North Idaho Posts: 296	It still doesn't fit unde the hood very well, but I refuse to get a cowl hood. Attached Images __________________ Just for the record, if I'm down to my last potato, I'm not sharing it with a guy who wants to kill me so he can get a better supply of virgins in paradise. That lesson is a little thing I call Economics 101, infidel style. --Scott Adams author of Dilbert

02-27-2003, 11:31 PM	#24
72CustomCamper Registered User Join Date: Feb 2003 Location: Bremerton, WA Posts: 86	sixnine- You can buy a two foot length of the threaded rod for your carb at Home Depot or Lowe's for about a buck or two (its a standard size National Coarse). Just hack it off at exactly the length you want. __________________ '72 GMC C20, "2500 Super Custom", Custom Camper, New 454 '93 K2500 Suburban, Old 454 (157K)

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