Air filter diameter
#2
10-07-2012, 12:43 AM
Join Date: Oct 2007
Location: The 'Burbs of Chicago
Posts: 18,306
The short answer is at a minimum, a 10" dia. x 3" tall, or 14" dia. x 2" tall (3" would be better).
The long answer...
Square inches of filter needed: C.I. x Max rpm divided by 20839
So, 350 x 6,000/20839 = 100 sq. in.
That's based on the CFM requirement of the engine at 100% volumetric efficiency, which your engine is not. Yours may be closer to .80, giving you 80 sq. in. needed.
Then get the circumference of the filter x the height to figure the total square inches.
14" x 3.1416 = 43.98". x 2" tall = 88 sq. in., or 3" tall = 132 sq. in.
You can do the math for a 10" filter. Be sure to show your work!
The long answer...
Square inches of filter needed: C.I. x Max rpm divided by 20839
So, 350 x 6,000/20839 = 100 sq. in.
That's based on the CFM requirement of the engine at 100% volumetric efficiency, which your engine is not. Yours may be closer to .80, giving you 80 sq. in. needed.
Then get the circumference of the filter x the height to figure the total square inches.
14" x 3.1416 = 43.98". x 2" tall = 88 sq. in., or 3" tall = 132 sq. in.
You can do the math for a 10" filter. Be sure to show your work!
#4
10-07-2012, 02:50 PM
Join Date: Aug 2008
Location: Portland, Or
Posts: 9,097
I don't do math. I usually just buy a 14" by 2"-3" thick. Never had a problem with it being too much filter. Just don't get those huge 6"-8" thick filters that the race cars use.
I usually just buy a 14" by 2"-3" thick. Never had a problem with it being too much filter. Just don't get those huge 6"-8" thick filters that the race cars use.
#5
10-07-2012, 02:56 PM
The short answer is at a minimum, a 10" dia. x 3" tall, or 14" dia. x 2" tall (3" would be better).
The long answer...
Square inches of filter needed: C.I. x Max rpm divided by 20839
So, 350 x 6,000/20839 = 100 sq. in.
That's based on the CFM requirement of the engine at 100% volumetric efficiency, which your engine is not. Yours may be closer to .80, giving you 80 sq. in. needed.
Then get the circumference of the filter x the height to figure the total square inches.
14" x 3.1416 = 43.98". x 2" tall = 88 sq. in., or 3" tall = 132 sq. in.
You can do the math for a 10" filter. Be sure to show your work!
The long answer...
Square inches of filter needed: C.I. x Max rpm divided by 20839
So, 350 x 6,000/20839 = 100 sq. in.
That's based on the CFM requirement of the engine at 100% volumetric efficiency, which your engine is not. Yours may be closer to .80, giving you 80 sq. in. needed.
Then get the circumference of the filter x the height to figure the total square inches.
14" x 3.1416 = 43.98". x 2" tall = 88 sq. in., or 3" tall = 132 sq. in.
You can do the math for a 10" filter. Be sure to show your work!
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