Fuel Injector and Fuel Pump Calculator

Brought to you by:
East Coast Rolling Thunder car club

This program will select from the following based on your input:

Fuel Injector Sizes: 19, 24, 30, 36, 38, 42, 47, 55 & 120 Lbs./ Hr

Fuel Pump Sizes: 110, 155, 190 & 255 Lph


Please complete the following:

How much power do you want:

Enter B.S.F.C. , if unknown enter the type of motor induction

If Supercharged or Turbocharged enter the anount of boost PSI

Rated fuel pressure of Injectors , if unknown do not change.

Rated fuel pressure of Fuel Pump , if unknown do not change.

Actual Fuel Pressure , if unknown keep the same as rated fuel pressure.

Number of Injectors

Check this box if this is a pure race application.



Calculated Fuel Injector Size: Lbs./ Hr               Calculated Fuel Pump Size: Lph 

Suggested Fuel Injector Size: Lbs./ Hr               Suggested Fuel Pump Size: Lph


For those who are interested here are the equations I am using:




Horsepower is either Crank or Rear Wheel

B.S.F.C. is Brake Specific Fuel Consumption

Fuel Injector Duty Cycle is normally 100% but for pure race applications it is 80%


This calculation is for information purposes only and isintended to be used as a guide. The user of this program assumes allresponsibility for sizing their fuel injectors. Any damage to anengine or fuel injector is the users sole responsibility. To find further information on how to size fuel injectors see the following:
RC Engineering

MSD Ignition

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