Use of the calculator

This tool allows you to assess the feasibility of an engine design or specification based on the current state of the art. Developed and tested entirely by Pro-1 Performance, it offers similar or better results than some expensive simulation software.

Data is entered at the top and the results are automatically displayed below. Reference values are indicated for some of the fields and those considered extreme or potentially erroneous for the proposed specifications are highlighted in red.

General input

10 (low performance), 15 (F1, MotoGP)

Injection

Recommended 80-90%

Use 0.45 – 0.5 for N/A engines and 0.55-0.65 for forced induction. Lb-HP/hr

Forced induction

Air restrictors

Results

Cylinder displacement (cc):
Engine displacement (cc):
Rod / stroke ratio:
Peak Power (HP):
Piston speed @ peak power (m/s):
Piston speed @ limiter (m/s):

Intake
Mean gas velocity @ inlet valve (m/s):
Mean gas velocity @ throttle body (m/s):
Minimum Crossed port area (mm2):
Equivalent diam @ min port crossed area:

Exhaust
Exhaust / intake area ratio:
Exhaust Gas velocity @ Peak power rpm (m/s):
Headers recommended diameter (mm):

Cams

Intake
Min recommended valve lift (mm):
Recommended efective area (mm2°):
Recommended lobe area (mm°):

Exhaust
Min recommended valve lift (mm):
Recommended efective area (mm2°):
Recommended lobe area (mm°):

Injection
Required Injector flow rate (cc/min @ 3bar):
Requried Injector flow rate (lb/h @ 45psi):
Required Fuel Pump flow rate (l/h):
Max available injector pulse (ms):
Flow rate for alternative fuel (cc/min):

Restrictors
Mean gas velocity through Restrictor (m/s):
Ideal Peak Power with restritor:
Critical RPM with restrictor:
Restrictor area (mm2):
HP/Restrictor area (HP/cm2):
Peak air mass (g/s):
Peak air mass (CFM):
Peak air mass (lb/min):
Fuel mass @ AFR 13,7 (g/s):

Pro-1 Performance is not responsible for the use of these results. They are to be taken as a reference but it is up to the engine technician to decide the optimum design parameters for each engine.