Calculator

Flow Conversion

Convert cc/min to lbs/hr

Convert lbs/hr to cc/min

Selecting the proper size Injector

Fuel Injector Size Calculator
Horsepower (at the flywheel)
Number of Injectors
B.S.F.C. *
Max Duty Cycle in % **

Required Injector Static Flow Rate @ 43.5 psi	lb/hr cc/min

Fuel Pressure Modification

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:	Injector(s)
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	" Hg
Expected Peak Horsepower	Peak Hp
Millisecond (Ms) Injector minimum open time ( 1 to 1.25):	Ms.
Your Installed Injector size (lb/hr):	Lb/Hr
Number of injections per cycle (batch 2, sequential 1):	#/cycle
How many strokes per cycle (four stroke = 4):	Stroke
Results
Injector Size @ 80% recommended duty cycle (lb/hr):	Lb/Hr
Max Hp with recommended injectors @ 85% duty cycle:	Peak Hp
Max Pulse Width Permitted @85% duty at peak rpm: (Ms):	Ms Peak
Max HP with Your Installed Injectors @ 85% duty:	Max Hp
Idle Millisecond Pulsewidth: Installed Injectors	Ms Idle
Projected cc's per minute: Installed Injectors, per injector at idle:	cc's / Inj.

SouthBay Fuel Injectors
566 Merrick Road # 3
Rockville Centre, NY 11570 tele: 516.442.4707 fax: 516.442.4709
cell: 516.492.6504

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