1952 45ci Air Filter

[rguimaraes]

I Need a air filter for my 1952 Servi car, all I have left is the cage it had a foam insert that fell apart. K&N has a filter PN# E-2470 for $59.99 anyone know another manufacture that has one and what the part number is and what are you using? I though about using copper wool to form a new filter like the original but I would like something that would filter the air better.

[Highlander]

The K&N will not work in a J-slot air filter housing. It is too wide and one cannot compress the filter enough to hook the slo. If you have the center screw type housing it should work.

[rguimaraes]

I Have the bayonet type mount not center screw, I made a filter with copper wool but he center cage that I have was made for the foam cover and doesn't fit tight, need something to take up the space and seal

[kitabel]

Copper wool is useful as a filter for a boat or airplane.
Otherwise not.

[T. Cotten]

I've still got a Geoff Ringle Old Iron K&N on the shelf, Folks!

With the special stainless spring assembly, for ninety bucks.

Just opened it up again, and there is no K&N part number on the filter, although still in the bag. It measures ~1.930" in thickness.

I have never installed one, because brillo pad filter elements are absolutely the best.
(If you don't think so, please buy my dead inventory.)

....Cotten

[BigLakeBob]

Copper wool is useful as a filter for a boat or airplane.
Otherwise not.

In your experience what do you feel is best? I got away from foam because of fuel soaking and possible fire. I feel the K&N is too restrictive. Currently running copper mesh in a non sand environment and bike runs great. Curious for you opinion. Thanks.

[kitabel]

Obviously, the largest area that fits inside the can is best. Read David Vizard's tests of the K&N, it's only restrictive when over-oiled (very common). There is a formula on the K&N site to determine how much filter area you need for how much power, then select a "universal" shape you can use. The usual CFM formula (D X RPM X VE / 3,456) is too small for a V-twin because the intake vacuum pulses are much stronger but much farther apart than in a V8 of the same size). An engineering friend suggested that this result times 3.3 is closer to what you want. 45.12" X 4,500 RPM X 90% VE = 53 CFM, X 3.3 = 174 CFM. K&N elements flow about 6 CFM per square inch; you need as close to 29 square inches or 6" OD X 1.54" element height + .75" for the ends = 2.30" thick. Use your actual cover ID and adjust height as needed.
With the center screw cover, although the OD is limited by the can ID you could use a much thicker element and a longer screw. Yes, it will get wet if ridden in rain.

[sswaney]

Jerry Greer sells a K&N that is made for the J-slot type cover.
Part # JG-2922
https://www.jerrygreersengineering.com/search?q=K%26N+filter

[kitabel]

That looks like K&N E-3180,

• Height: 1.75 in
• Inside Diameter: 4.5 in
• Outside Diameter: 5.875 in

The filter area is 18.45", smaller than I would like