Re: is an air filter benefical for air flow around the carb?
[Re: DGS]
#2466789
03/15/18 08:50 AM
03/15/18 08:50 AM
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Joined: Apr 2007
Posts: 289 Lowes
steve660
enthusiast
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enthusiast
Joined: Apr 2007
Posts: 289
Lowes
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I had a 440 running low 12 - hi 11s with a GM dual snorkel breather with 4" alum dryer ducting running to both sides of radiator support. I raced without a filter. Put in a K & N 3 x 14 filter and picked up .10 in the quarter mile.
PSO headed 632 from MM. Cracked cylinder, loose valve seats, low oil pressure, low cylinder pressure. ..... Now its a door stop....
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Re: is an air filter benefical for air flow around the carb?
[Re: DGS]
#2466791
03/15/18 08:54 AM
03/15/18 08:54 AM
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Joined: Jan 2005
Posts: 4,243 Charlotte, North Carolina
sgcuda
master
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master
Joined: Jan 2005
Posts: 4,243
Charlotte, North Carolina
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An air filter can make a difference, but is must not be restrictive, either. The air cleaner base plate design plays an important roll, too, as far as smoothing air flow into carb. There is a reason why so many raise up and then roll down to the air filter lip.
[image][/image]
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Re: is an air filter benefical for air flow around the carb?
[Re: DGS]
#2466793
03/15/18 09:00 AM
03/15/18 09:00 AM
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Joined: Feb 2003
Posts: 1,942 Metro Detroit
OUTLAWD
top fuel
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top fuel
Joined: Feb 2003
Posts: 1,942
Metro Detroit
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+1 on not being restrictive. I picked up 0.07-.1 going from a K&N 14x3 element to a WIX racing element, but lost ET when I pulled it off all together.
Faster, Faster until the thrill of speed overcomes the fear of death...
71 Swinger - slowly collecting dust/parts 66 Belv. II - just a streetcar 88 Mustang - turbo LS beater
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Re: is an air filter benefical for air flow around the carb?
[Re: DGS]
#2466808
03/15/18 10:24 AM
03/15/18 10:24 AM
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Joined: Jan 2003
Posts: 13,374 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,374
Marion, South Carolina [><]
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FWIW...Patrick at Pro Systems Carbs once told me that if the car went faster w/ an air filter on it, then the mixture isn't right.
Now IMO, an air filter can help if you have a hood scoop setup that is creating a lot of turbulence at the carb inlet. Doesn't mean the filter made it faster (like K&N claims), it just proved you need to rethink your hood scoop setup.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: is an air filter benefical for air flow around the carb?
[Re: DGS]
#2466817
03/15/18 10:45 AM
03/15/18 10:45 AM
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Joined: Jul 2005
Posts: 636 Graz, Austria
DGS
OP
mopar
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OP
mopar
Joined: Jul 2005
Posts: 636
Graz, Austria
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instead of using an air filter to reduce turbulence a honeycomb should do the same job while being less restrictive.
Last edited by DGS; 03/15/18 10:48 AM.
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Re: is an air filter benefical for air flow around the carb?
[Re: racerx]
#2467322
03/16/18 01:50 PM
03/16/18 01:50 PM
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Joined: Jul 2004
Posts: 19,318 State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,318
State of confusion
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Kind of remembering Thumpman did a deal were he drill hole in the back of his hood, to stop some of the turbulence under his sixpack hood, I think he said it pick up . Yes it did and the afr's smoothed way out as well..........As for K&N filters, done w'those and only run Wix Racing filters w/damn near zero restriction...........
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: is an air filter benefical for air flow around the carb?
[Re: Thumperdart]
#2467380
03/16/18 04:07 PM
03/16/18 04:07 PM
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Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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Kind of remembering Thumpman did a deal were he drill hole in the back of his hood, to stop some of the turbulence under his sixpack hood, I think he said it pick up . Yes it did and the afr's smoothed way out as well..........As for K&N filters, done w'those and only run Wix Racing filters w/damn near zero restriction........... I won't drill holes in the back of my scoop, but you did just give me an idea for a spring-loaded pressure bypass in the plate that seals my carb to my hood.
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Re: is an air filter benefical for air flow around the carb?
[Re: BradH]
#2467482
03/16/18 08:16 PM
03/16/18 08:16 PM
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Joined: Aug 2008
Posts: 4,072 Mo.
racerx
master
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master
Joined: Aug 2008
Posts: 4,072
Mo.
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Kind of remembering Thumpman did a deal were he drill hole in the back of his hood, to stop some of the turbulence under his sixpack hood, I think he said it pick up . Yes it did and the afr's smoothed way out as well..........As for K&N filters, done w'those and only run Wix Racing filters w/damn near zero restriction........... I won't drill holes in the back of my scoop, but you did just give me an idea for a spring-loaded pressure bypass in the plate that seals my carb to my hood. But will it smooth out the air flow above the carb ?
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Re: is an air filter benefical for air flow around the carb?
[Re: DGS]
#2467485
03/16/18 08:23 PM
03/16/18 08:23 PM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
master
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master
Joined: Sep 2014
Posts: 4,457
Washington
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I worked on a friends FED (nick name balls cooker...long story) and it two 2.250 holes in the back of the scoop to make it run. Before that it was pissed off. I don't remember who it was that told me to drill the holes but it went from untunable to tunable.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: is an air filter benefical for air flow around the carb?
[Re: DGS]
#2467493
03/16/18 08:54 PM
03/16/18 08:54 PM
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Joined: Dec 2005
Posts: 11,611 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,611
Fulton County, PA
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I always ran a K&N Stubstack with the carb sealed to the scoop. On the last deal we ran, we paid attention to the shape of the pan in the scoop and used a K&N tall velocity stack style air cleaner without oil. Just trying to straighten up any turbulence and keep the big stuff out and it made a difference in how the cylinders looked after a year. Never tried A-B-A tests. Ran good MPH and seemed happy.
If the results don't match the theory, change the theory.
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Re: is an air filter benefical for air flow around the carb?
[Re: madscientist]
#2467602
03/17/18 02:20 AM
03/17/18 02:20 AM
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Joined: Feb 2015
Posts: 2,079 CA
crackedback
top fuel
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top fuel
Joined: Feb 2015
Posts: 2,079
CA
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I worked on a friends FED (nick name balls cooker...long story) and it two 2.250 holes in the back of the scoop to make it run. Before that it was pissed off. I don't remember who it was that told me to drill the holes but it went from untunable to tunable. We called that "air packing" which basically creates a blockwall of high pressure in the scoop/opening. Drill holes, pressure is released and flow is re-established. A good filter is beneficial on a drop base. Not so much in a velocity stack, etc. Carbs like air coming in from STRAIGHT down, not turning corners to enter the venturis. There are test out there that display this.
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Re: is an air filter benefical for air flow around the carb?
[Re: crackedback]
#2467611
03/17/18 02:44 AM
03/17/18 02:44 AM
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Joined: Aug 2003
Posts: 43,228 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,228
Bend,OR USA
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One of the last drag race motors I dyno tune in SO CA was a 440 block stroke to 3.91 stroke with a set of CNC ported B1-BS heads taken out to M.W. intake port size, they flowed right at 350 CFM at .700 on the intakes. The motor had a little over 12.0 to 1 compression and a M.W. port size tunnel ram with a pair of Holley 750 D.P. prepared by JET performance in SO CA and a old Crane custom ground solid roller cam, nothing all out race at all We played with timing, valve lash, spark plug gap and heat range and finally treid a set of nine inch tall velocity stacks with a set of 11 inch diameter by three inch tall paper air filter elements on top of the stacks, George, the dyno operator, said that change will make the motor lose HP, it didn't It gained around 8 HP from the bottom RPM all the way up to the peak RPM, 7000 RPM I'm a firm believer on all Holley D.P. that straightening the air flow up above those carbs. really help them run better
Last edited by Cab_Burge; 03/17/18 02:46 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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