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Old 07-27-2013, 10:06 PM   #1
flathead4rd
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Default Air Cleaners

I've go my three 97's set up and all is running well. Rebuilt by Uncle Max. Used a unisyn to balance them out. Great response, starts easily, plugs look good, etc. My question is: When I put on the air cleaners there is a noticable change in engine RPM. I'm using the bonnet type air cleaners with louvers and K&N filter elements. My concern is that this will cause a rich running condition. Any suggestions as to which type of air cleaners are best to run. Frog Mouth, Velocity Stacks, etc. Thanks for you inputs.

Last edited by flathead4rd; 07-27-2013 at 10:08 PM. Reason: grammer change
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Old 07-28-2013, 08:46 AM   #2
Tony, NY
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Default Re: Air Cleaners

Someone, in the past, posted that a 4" tall air filter (K/N) is needed. Smaller are too restricted. This is from memory.
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Old 07-28-2013, 05:24 PM   #3
flathead4rd
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Default Re: Air Cleaners

Thanks Tony, I'll check them out. I can't believe that 140 people viewed this post and only one (You) had a suggestion. Thanks again.
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Old 07-28-2013, 06:17 PM   #4
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Default Re: Air Cleaners

I'll wager that if you send a PM to Walt Dupont, and asked nicely, he'd send you the part number for the tall K&N aircleaners.
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Old 07-28-2013, 07:04 PM   #5
Talkwrench
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Default Re: Air Cleaners

Personally I cant see how a filter that small and so close to the opening of carb can be any good , You've seen it yourself. An airfilter on a carb if correct so show no noticable difference either on or off.
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Old 07-28-2013, 08:03 PM   #6
Tony, NY
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Default Re: Air Cleaners

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Here's some info.
http://www.fordbarn.com/forum/showth...ght=air+filter
http://www.knfilters.com/search/prod...id=526551&rw=1

Last edited by Tony, NY; 07-28-2013 at 08:07 PM. Reason: added link
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Old 07-29-2013, 08:59 AM   #7
flathead4rd
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Default Re: Air Cleaners

Thanks to all who replied and thanks to Uncle Max for some great carb rebuilding.
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Old 07-29-2013, 01:27 PM   #8
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Default Re: Air Cleaners

If the air cleaner makes a difference on or off, the filter area is way too small.
Figure 3 to 4 times the venturi area to be safe. It also depends on the filter media. (paper,foam,etc)
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Old 07-29-2013, 01:44 PM   #9
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Default Re: Air Cleaners

If you use the open side 4" air cleaner there is one from an Onan engine much taller not to expensive but works Wix 42362 Laurie
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