[steve25]

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

[RocktimusPryme]

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

[JLMounce]

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.

[Steve C.]

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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