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Selecting the Proper Size Injector Calculator

This guideline can help in determining what injector size to use.

* Brake Specific Fuel Consumption: is the amount of fuel consumed (in lbs. per hour) for each horsepower made. This should be .45 to .50 for naturally aspirated engines, .55 to .60 for supercharged engines, and .60 to .65 for turbocharged engines.

** Maximum Injector Duty Cycle should be around 80% max for safe operation. This allows for some future horsepower increases.

Professional Fuel Injector Calculator

(Idle & Peak Values)

Engine Displacement (CID):

C.I.D. Idle Target RPM:

Idle RPM Peak RPM: Your rev limit may occur before the peak value.

Peak RPM Volumetric Efficiency at Idle is typically 10% to 15%:

Number of injectors in the System:

Brake Specific Fuel Consumption (.5 for 2 Valve, .45 or less for 4 valve) B.S.F.C.:

Idle in Inches of Mercury (In Hg.) If Idle in Kilopascals (kpa): Then kpa / 3.3864 = In Hg

Expected Peak Horsepower

Millisecond (Ms) Injector minimum open time (1 to 1.25):

Your Installed Injector size (lb/hr):

Number of injections per cycle (batch 2, sequential 1):

How many strokes per cycle (four stroke = 4):

Results

Injector Size @ 80% recommended duty cycle (lb/hr):

Max Hp with recommended injectors @ 85% duty cycle:

Max Pulse Width Permitted @ 85% duty at peak rpm: (Ms):

Max HP with Your Installed Injectors @ 85% duty:

Idle Millisecond Pulsewidth: Installed Injectors:

Projected cc's per minute: Installed Injectors, per injector at idle:

Fuel Pressure Modification Calculator

By changing your fuel pressure, you can change the flow rates of your injectors.

For example: An injector that flows 330 cc @ 40 psi will flow 369 cc @ 50 psi.

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Selecting the Proper Size Injector Calculator

Required Injector Static Flow Rate @ 43.5 psi

Professional Fuel Injector Calculator

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Fuel Pressure Modification Calculator

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