Drop base type air cleaner
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[[File:Moroso drop base clearance hei.jpg|frame|left|400px|Moroso p/n 65927 14" drop base clearance HEI]] | [[File:Moroso drop base clearance hei.jpg|frame|left|400px|Moroso p/n 65927 14" drop base clearance HEI]] | ||
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| − | ==Other things that can be done to gain clearance== | + | ==Filter size formulas== |
| + | *Square inches of filter required for a motor = CID x Maximum RPM / 20839 | ||
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| + | *CFM required for a 4 stroke motor = CID x Maximum RPM / 3456 | ||
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| + | *CFM required for a 2 stroke motor = CID x Maximum RPM / 1728 | ||
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| + | *CFM required for a turbocharged or supercharged motor = Pounds of Boost / 14.7 | ||
| + | **Add 1.0 to this answer. This relates to #2 and #3 | ||
| + | **Example: (CID x maximum RPM x #4 ) / 3456 or 1728 | ||
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| + | *To find circumference of a circle multiply diameter by 3.1416 | ||
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| + | *To find diameter of a circle multiply circumference by .31831 | ||
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| + | '''CFM Formulas for Filters''' | ||
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| + | *Round: Diameter x Height x 6 x 3.14 | ||
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| + | *Flat Panel: Length x Width x 6 | ||
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| + | *Universal Round Taper: (Base + Top) / 2 = A; take A x Length x 6 x 3.14 | ||
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| + | *Universal Round Straight: Diameter x Length x 6 x 3.14 | ||
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| + | ==Other things that can be done to gain hood clearance== | ||
Using a bolt to hold down the air filter assembly lid will gain some clearance. Cut or find a suitable bolt that fits instead of using a stud and wing nut. | Using a bolt to hold down the air filter assembly lid will gain some clearance. Cut or find a suitable bolt that fits instead of using a stud and wing nut. | ||
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| + | An obvious choice is to use a shorter filter element. But remember that the engine gets all its air through the filter and if it's too small, the results are a too-rich condition, poor performance ans economy, as well as a shorter air filter element service life. | ||
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| + | [http://www.thedirtforum.com/airfilterheight.htm Air filter height calculator] | ||
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| + | ==Other info== | ||
| + | [http://www.bobistheoilguy.com/airfilter/airtest2.htm Air filter flow tests] | ||
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[[Category:Engine]] | [[Category:Engine]] | ||
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