Stock Air Cleaner + better flowing Air Filter

I was reading some old posts about the stock GS air Cleaner and the insufficient air flow at higher power levels. Here is one idea to improve the air flow. This is a little more that the old flip the lid approach. Jim Weise mentioned using a 14" lid on the stock set up and I went a little further with a taller air filter. I found some data from a Ford forum(http://forum.grantorinosport.org) and selected a 4" filter. I found an inexpensive 14" lid on Amazon (the chrome was cheaper that the black!). I had to use a longer stud to make it work so I used a piece of 1/4-20 all thread. The filter is a Delco A697C. And its easy to replace the stock parts for a show. See below:



The data: Author: Pierre Lafontaine - Air Inlet Systems
Air Filter Flow Test
14" x 3" Round Flow # @ 5" H2O % Flow Rating Swirl
Brand Part # Size Material
Wix 46945R 14x3 Glass 860 CFM 100% 119
K&N E-1650 14x3 Cotton 835 CFM 97.1% 126
AIS Cotton AF3C 14x3 Cotton 830 CFM 96.5% 121
AIS Cotton AF3C-2 14x3 Cotton/Synt 830 CFM 96.5% 130
FRAM FRM4 14x3 Paper 791 CFM 91.9% 128
Moroso 97080 14x3 Paper 776 CFM 90.2% 131
Amsoil 52 14x3 Foam 774 CFM 90% 140
Purolator APF74 14x3 Paper 736 CFM 85.6% 146
AIS AF3 14x3 Paper 724 CFM 84.1% 148
Wix 42095 14x3 Paper 721 CFM 83.8% 149
Wix 42095R 14x3 Paper 712 CFM 82.8% 143
Fram CA136 14x3 Paper 710 CFM 82.6% 142
Edelbrock 1217 14x3 Paper 701 CFM 81.5% 154
NAPA/CompPol 22095 14x3 Paper 693 CFM 80.6% 155
Wix 42095 14x3 Paper 674 CFM 78.4% 163
Wix 46947R 14x3 Paper 595 CFM 69.2% 175

Air Filter Flow Test
14" x 4" Round Flow # @ 5" H2O % Flow Rating Swirl
Brand Part # Size Material
Wix 46944R 14x4 Glass 907 CFM 100% 116
AIS Cotton AF4C 14x4 Cotton 883 CFM 97.4% 116
K&N E-1690 14x4 Cotton 882 CFM 97.2% 121
K&N 61-4020 14x4 Cotton 880 CFM 97% 120
AC Delco 697C 14x4 Paper 825 CFM 91% 132
Accel (dry) 70004 14x4 Foam 820 CFM 90.4% 120
Amsoil 25 14x4 Foam 820 CFM 90.4% 131
Motorcraft FA705 14x4 Paper 814 CFM 89.7% 131
Wix 42096 14x4 Paper 813 CFM 89.6% 132
AIS AF4 14x4 Paper 803 CFM 86.5% 138
Fram CA3492 14x4 Paper 796 CFM 87.8% 126
MotoMaster 2330090 14x4 Paper 788 CFM 86.9% 135
Wix 42096R 14x4 Paper 786 CFM 86.7% 136
Wix 46946R 14x4 Paper 683 CFM 75.3% 155

Note that the ones above the K&N are "qualifying" filters and may not stop smaller particles.

 

well sh it, you got no restriction there. Just warm engine compartment air. That is probably the best you can do with that setup. A K&N filter would give you even better flow and less dirt too. I would be tempted to add 2 more snorkels on both sides , the rectangular type. You could take them off a truck air cleaner at any wrecking yard. A 4 snorkel air cleaner, helllllll yeah.

 

This is really useful info, thank you, this shows you how easy you can shoot yourself in the foot, one of those brand filters only flowed 60 something percent, wow,

 

Great data!

I run a stock filter, with heat stove, in cooler months and an open 4" filter in the summer. The difference is really noticeable.

 

I run mine open too with a K&N topper.


0

 

I've read where the topper can disrupt air flow in to the choke horn. Have you run any back to back tests with topper and with a solid top?

 

Never really gave much thought but I
might to give it a try and see if it affects anything.

 

If nothing else, it gives me a reason to spin the tires!

 

And apparently the spun aluminum type cover is better than the flat/ standard chrome lids. o No:

http://www.speedwaymotors.com/Sure-Seal-Air-Cleaner-Top-Only-14-Inch-Diameter,99702.html


https://www.google.com/imgres?imgur...act=8#h=387&imgrc=w5zGmD13GfEggM:&vet=1&w=620

 

I know running my 71 and 73 with no air cleaner at all is good for a 10th.....