Fuel Calculator

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.

HP	BSFC	lbs/hr	USG/hr	L/hr	L/min	Surge Tank L	Surge Seconds

The formulas used in the following air filter calculators are based on the information in the K&N Filter Facts page.

A K&N filter minder can be used to monitor the filter restriction.

K&N Air Filter Area Requirements Calculator

CID	Max RPM	Area in2	Area cm2

K&N Round Air Filter Area Performance Calculator

K&N recommend the height of the filter is between 1/5 and 1/4 of the diameter.

Dia in	Height in	Seal in	Height Range	Area cm2	Area in2	CID	Max RPM

K&N Panel Air Filter Area Performance Calculator

Measure the filter area excluding the seals.

Length mm	Width mm	Area cm2	Area in2	CID	Max RPM

K&N Cone Air Filter Area Performance Calculator. (RR-3001)

Base Dia mm	Top Dia mm	Height mm	Area cm2	Area in2	CID	Max RPM

K&N Oval Tapered  Air Filter Area Performance Calculator. (RF-1034)

Measure the circumference of the top and base of the filter then measure the height of the filter excluding the end caps.

Top Circ mm	Base Circ mm	Height mm	Area cm2	Area in2	CID	Max RPM