Projects Flathead Air Cleaner Choice

The filters that l am running ,can get part numbers if you wanted, they seem to work well

 

Here is my 276 with K&N filters sized to flow.
John

 

Read something in a tuning book a long time back. Recommended that each filter should have a capacity at least equal to one engine cylinder
On that theory a flathead should have room in there for a large can of beans.
Paper element on my wee 4bbl is about 6" i.d. x 4" high. Many runs on a quiet road with a gas analyser, readings all in the green mid range, so I assume thats big enough.

 

There is a formula for filter area needed.
ci x rpm divided by 20,839 equals filter area needed.
This link is for model A but principle is same.
http://www.model-a.org/filtering_air_into_carb.html
Divide number by number of filters.

John

 

K&N makes an oval filter for these carbs. More filter area than the round ones. Overall, though, I don't think that much of their filters. I'm thinking of fabricating my own to use taller, larger paper filters. Get rid of those helmets.

 

If your going to have it on an enclosed hood I would think outside the box. I’d find a 60’s Chevrolet large round ac unit with some type of snorkel. I prefer an oval. I would fabricate a new bottom using the outer few inches for the filter fit. I’d sink it partially over the carbs. Chrome the top or even black depending or the rest of your engine compartment.

 

Something like this then?

 

^^^^^ Classy would have been to leave the Campbells wrapping on them.

 

Here is a pair of vintage STELLINGS and HELLINGS.

 

Will those holes pass enough sauce?

 

To fit under the hood with it closed

Early MJ (Jeep) air horns and filters for road driving.
You can put the helmet style back on at the show

 

Been running these for some years but I have found K&N filters (SU-7503) that are the same dimension except twice as tall @4.5" that I may try. May not be the best but it should be better at twice the surface area.