Formulas used by the calculator are taken from the Aeromotive Technical Bulletin #501
Use the following information as a guide. The actual BSFC can be determined through flywheel dyno testing.
Naturally aspirated engines are normally most efficient with a BSFC between .4 and .5 lbs/hp/hr.
Nitrous combinations use a little extra fuel and often develop a BSFC from .5 to .6 lbs/hp/hr.
Forced induction engines are usually least efficient and BSFC ranges from .6 to .75 lbs/hp/hr.
The formulas used in the following
air filter calculators are based on the information in the
K&N filter minder can be used to monitor the filter restriction.
K&N Air Filter Area Requirements Calculator
K&N Round Air Filter Area Performance
K&N recommend the height of the
filter is between 1/5 and 1/4 of the diameter.
K&N Panel Air Filter Area Performance
Measure the filter area excluding the
K&N Cone Air Filter Area Performance
K&N Oval Tapered Air Filter Area Performance
Measure the circumference of the top and
the filter then measure the height of the filter excluding the end caps.