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Performance Calculators



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RPM calculator

Gear Ratio

Tire Radius

MPH

RPM =

 

CFM needed

Engine size (cid)

Max RPM

Volumetric Efficiency *

CFM Needed =

* 1.0 is a good estimate for a mild performance engine

 

Horsepower From MPH Calculation:

1/4 Mile
Speed (mph)

Vehicle
Weight (lbs.)

 

Horsepower

 

Liter/CID Conversions:

Liters

Cubic Inches

 

Displacement Calculation:

Bore

Stroke

# of Cylinders

CID=

 

Miles per Gallon:

Miles
Travelled

Gallons
Used

 

Miles Per Gallon

 

Kilometers per Liter:

Kilometers
Travelled

Liters
Used

 

Kms Per Liter


 

Compression Ratio Calculator

Enter Input Unit Type 1=inches 2=mm :
Enter Bore size:
Enter Stroke size:
Enter Head Gasket Bore size: 4.100 is standard small block
Enter Compressed Head Gasket Thickness:
Enter Combustion Chamber Volume in CC's: add volume above top piston ring to this or this calculator will not be accurate
Enter Piston Dome Volume in CC's use "-" for Dished Pistons: typically -2.3cc for 2 valve reliefs and -4.6cc for 4 valve reliefs for flat top pistons
Enter Piston Deck Clearance    If ABOVE deck use "-" :
           
Compression Ratio: :1                 Total Volume: cc


 


 

1/4 Mile to 1/8 Mile ET Conversion
 Enter your 1/8 Mile ET or 1/4 Mile ET

Enter your 1/8 ET:

Your 1/4 Mile ET is:

 

Enter your 1/4 ET:

Your 1/8 Mile ET is:

Enter the Mile ET or the 1/8 Mile ET and
Click on Calculate...

FORMULA:
Mile ET = (1/8 Mile ET + .22) / .655
1/8 Mile ET = ( Mile ET * .655) - .22

 

 


 

Estimate MPH from 60 foot time

Enter 60 foot Time:

60 foot MPH:


 

 

 

Injector Flow Rate (lb/hr) =

Engine HP(1) x BSFC(2)
Number of Injectors x Injector duty cycle(3)

 

Injector Flow Rate (cc/min) =

Engine HP(1) x BSFC(2) x 10.5
Number of Injectors x Injector duty cycle(3)

 

Fuel injectors max HP (lb/hr)* =

Injector flow rate x Number of injectors x 0.8
BSFC

Or

Fuel injectors max HP (cc/min)* =

Injector flow rate x Number of injectors x 0.8
BSFC x 10.5

Injector flow rate conversions:

Fuel injectors flow (lb/hr)* =

Fuel injector flow (cc/min)
10.5

 

Fuel injector flow (cc/min)* =

Fuel injectors flow (lb/hr) x 10.5