Old but relevant.
 

Here’s some old 70s info from Holley air filter testing.

Do we know how tall the 14" element is they are using? When they say 2 elements were used do they mean a total of 6 inches tall stack of filter?

Im guessing its probably 2" and they are stacking to 4" total

Probably also important to note that the air cleaner probably needs to flow additional CFM over what the engine can/does consume in order not to be a restriction.

K&N uses an equation to approximate necessary filter size (based on cotton-gauze type filters) for a specific engine.

Area of the filter = CID*RPM/20839. For my 465 that I shift at 6000 rpm, that will require a filter area of 133.88 sq in.

For a standard 14" filter, you need to figure out how tall it should be.

Height = Area/3.1416x14 + .75 to account for sealing ring. For my engine I need a filter that is 14" round and 3.8" tall. So a pretty standard 14x4" filter element provides enough breath for my engine based on K&N's research.

And another related subject.....

Cool Air Equals Power

"The whole point of a cold air intake is to get colder air, which is denser, and holds more oxygen for a given volume. The colder, the better. But there is no formula or rule of thumb that will tell us how much of a power increase to expect with a given decrease in temperature. There are many variables."

https://nasaspeed.news/tech/engine/c...why-they-work/


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