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Air Cleaner Size #3004666
01/12/22 06:04 PM
01/12/22 06:04 PM
Joined: Jan 2005
Posts: 1,768
Keymar, MD
DusterKid Offline OP
top fuel
DusterKid  Offline OP
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Keymar, MD
Looking to add an air cleaner to my car. It's a Duster with a 440. Using a Victor 440 intake with a 1" spacer (adjustable resistor plate to use for index class racing). Car was built almost 30 years ago and has a snorkel style hood scoop. The hood has a decent size hole, but I'm limited to about a 9" diameter and 3 1/2-4" tall air cleaner. Engine is a stock stroke 440 and I shift at 6,000, trap around 63-6400. I don't want to choke the engine down, but worried that a 3-3 1/2" air filter element might be to small with the 9" diameter. How small of an air filter have you guys used on your combos that haven't effected the overall performance?

Re: Air Cleaner Size [Re: DusterKid] #3004674
01/12/22 06:27 PM
01/12/22 06:27 PM
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Denver, CO
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BigBlockGTS Offline
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Denver, CO
I'm not as hardcore as some in this particular forum but I know that Car Craft did an article on various sizes and the losses of air filters on a pretty robust engine- it was on a dyno though. Carb inlet size is only so big- it is more about smoothing and directing airflow than filter size- carbs need a flat flange surface leading into the carb itself . For a snorkle style scoop, you may be able to get some additional filter area by going with an oval air cleaner.

I did a quick search and found these two references. May not have been the same article I was thinking of but it is a start. I thought this was interesing:

Car Craft April 2002, Filter Test....Page 72 & 73
1. K&N #E-3403, 7"X3"....49.5 SQ.IN..........520 Horsepower..........0.8Hg vac
2. K&N #E-3770, 14"X6"...230.9 SQ.IN........520 Horsepower..........0.6Hg vac

HOT ROD - JUNE 2002 - "AIR FILTERS SHOOTOUT"

Using 14"x3" filters, each half covered with duct tape before the test began, using only 1/2 the filter area.

1. Advanced Flow Eng. (AFE):.... PN 10-10009..$59.56......... 365.9 HP
2. Holley :............................... PN 220-5.......$39.99.........367.2 HP
3. K&N Engeneering:.................. PN3737.........$69.93.........368.7 HP
4. Purolator;............................ PN A60074.....$5.99...........368.7 HP
5. Rush Performance;................. PN 710048.....$44.30.........368.5 HP

I hope this hels.

Re: Air Cleaner Size [Re: DusterKid] #3004676
01/12/22 06:30 PM
01/12/22 06:30 PM
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Fulton County, PA
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CMcAllister Offline
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Fulton County, PA
Largest that will fit. Radius/velocity stack/drop base contour. Low restriction. I used an unoiled K&N that worked fine. Just trying to keep the big chunks out. Cylinder walls actually looked better after I started to use one.

Last edited by CMcAllister; 01/12/22 06:31 PM.

If the results don't match the theory, change the theory.
Re: Air Cleaner Size [Re: CMcAllister] #3004729
01/12/22 08:51 PM
01/12/22 08:51 PM
Joined: Jan 2005
Posts: 1,768
Keymar, MD
DusterKid Offline OP
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DusterKid  Offline OP
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Keymar, MD
My plan was to go with a K&N Racing Filter non oil gray gauze. They make a 5" one that I thought would fit. I ordered a base and did some measuring and it will end up hitting the side of the scoop before the hood shuts (Dang off set engines), They do make a 3" (Part Number 28-4245 ) one that should fit okay. I stumbled across a air filter calculator but wasn't sure how accurate it was.

Basically you take Engine CI x RPM / 25500 (446 x 6500 / 25500 = 113.68)

Air cleaner diameter x 3.14 (9 x 3.14 = 28.26)

Than take 113.68 / 28.26 = 4.02 and that is roughly how tall of an air filter you need for that diameter.

Re: Air Cleaner Size [Re: DusterKid] #3004737
01/12/22 09:23 PM
01/12/22 09:23 PM
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usa
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lewtot184 Offline
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IIRC k&n had on their website 20sqin's per 100hp.

Re: Air Cleaner Size [Re: DusterKid] #3004738
01/12/22 09:29 PM
01/12/22 09:29 PM
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Oregon
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AndyF Offline
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Oregon
See what Wix has in that size. I've gotten rid of all of my K&N filters and moved everything over to Wix racing filters.

Re: Air Cleaner Size [Re: AndyF] #3004762
01/12/22 10:58 PM
01/12/22 10:58 PM
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On the run…
BloFish Offline
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On the run…
Yep, me too.


It really doesn't matter whether you win or lose…
as long as you look good doing it!

‘65 A100
‘69 ‘Cuda
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Re: Air Cleaner Size [Re: BloFish] #3004768
01/12/22 11:22 PM
01/12/22 11:22 PM
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Frostbitefalls MN (Rocky&Bullw...
gregsdart Offline
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Frostbitefalls MN (Rocky&Bullw...
I have run a 14x3 WIX race filter with zero loss on a 900 hp motor. If they don't have a filter in your size, it might be possible to cut enough out of a bigger filter to get what you need. Where there is a will, there is a way.


8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
Re: Air Cleaner Size [Re: AndyF] #3004774
01/12/22 11:59 PM
01/12/22 11:59 PM
Joined: Oct 2003
Posts: 11,678
W. Kentucky
justinp61 Offline
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W. Kentucky
Originally Posted by AndyF
See what Wix has in that size. I've gotten rid of all of my K&N filters and moved everything over to Wix racing filters.


The shop that dynoed my engine builds a lot of roundy round dirt track engines. The owner told me that the Wix Racing filter loses less than HP than any other filter.

Re: Air Cleaner Size [Re: AndyF] #3004827
01/13/22 10:48 AM
01/13/22 10:48 AM
Joined: Feb 2003
Posts: 2,560
S.E. Michigan
cl440 Offline
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S.E. Michigan
Originally Posted by AndyF
See what Wix has in that size. I've gotten rid of all of my K&N filters and moved everything over to Wix racing filters.


Been using the Wix racing air filters for years. We also run the KN filter top. Best of 8.51@156MPH with a 4150 carb on Alcohol

Crop 2021.jpg
Re: Air Cleaner Size [Re: cl440] #3004892
01/13/22 02:01 PM
01/13/22 02:01 PM
Joined: Oct 2004
Posts: 2,799
Connecticut
FurryStump Offline
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One of the filter top ones should be more than enough.


best of 11.39 at 117 mph 1.60 60’. 68 340 S Barracuda Fastback F.A.S.T [IMG]http://i67.tinypic.com/2mnnnnt.jpg[/IMG]
Re: Air Cleaner Size [Re: DusterKid] #3004974
01/13/22 04:41 PM
01/13/22 04:41 PM
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Posts: 43,007
Bend,OR USA
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Cab_Burge Offline
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Bend,OR USA
I've tested air cleaners, air cleaner bases and K&N filter tops on an engine dyno and at the track, the K&N filter lids on the engine on the dyno lost 3 to 8 HP (CRS exactly: whiney:) At the track with Hemi hood scoop on one of my old race Dusters the car pick up.3 MPH running it versus a raise center chrome or steel lid: confused:
Every car that I have raced (with and without a scoop) without an air cleaner ran slower and less MPH than with the base only on the carbs. and or with a good air cleaner element up scope
I use drop base air cleaners as large as possible to help run as quick and as fast as possible which insures the motor lives longer and doesn't screw up the ring seal due to dirt and debris getting suck into the motor any time it is running work up

Last edited by Cab_Burge; 01/13/22 04:44 PM.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Air Cleaner Size [Re: Cab_Burge] #3005243
01/14/22 01:12 PM
01/14/22 01:12 PM
Joined: Sep 2003
Posts: 19,239
north of coder
moparx Offline
"Butt Crack Bob"
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north of coder
how big of a drop on the base Cab ?
beer

Re: Air Cleaner Size [Re: moparx] #3005459
01/15/22 08:33 AM
01/15/22 08:33 AM
Joined: Jan 2003
Posts: 2,902
A shed in England
Tig Offline
master
Tig  Offline
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Posts: 2,902
A shed in England
We've been using these guys for some time. Lots of options.
http://www.r2cperformance.com/clear-oval--air-cleaner-base-and-lid.aspx
[Linked Image]


'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials.
9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge.
RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
Re: Air Cleaner Size [Re: moparx] #3005612
01/15/22 03:31 PM
01/15/22 03:31 PM
Joined: Aug 2003
Posts: 43,007
Bend,OR USA
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Cab_Burge Offline
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Bend,OR USA
One inch to three inch on the Dominator drop bases, maybe similar on the 4150 bases shruggy
They vary, use the one that works for you scope up


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)






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