Engine Displacement

Bore (mm)
Stroke (mm)
Engine Displacement (liters)

Fuel Flow Conversion


Fuel Injector Size Calculator

HP (at the flywheel)
Number of Injectors
Max Duty Cycle in % **
Required Injector Static
Flow Rate @ 43.5 psi
lb/hr cc/min

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.

Fuel Pressure Change Calculator

Old Pressure (psi)
New Pressure (psi)
Old Flow Rate (cc/min)
New Flow Rate (cc/min)