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Horsepower Calculator
  (Based on total weight/E.T.)

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Car Model :
Weight W/Driver : (in Pounds)
1/4 Mile ET  : (in seconds)

 

Compression Ratio Calculator


Bore in
Stroke in
Head cc's
Gasket Thickness in
Deck Height in
Dish or Valve Pocket [-] or Dome [+] cc's
Number of Cylinders

Displacement Cubic Inches
Compression Ratio

 

Compression Ratio Formulas
GV (Head Gasket Volume) = Bore(in) X Bore(in) X 12.87
    X (Head Gasket Thickness in Inches)


DV (Below Deck Volume) = Bore(in) X Bore(in) X 12.87 
    X (Inches Below the Deck)


HV (Head Volume) = CC's


VV (Dish, Valve Pocket, Dome Volume) = CC's 
(Minus for dish or valve pockets, Plus for dome)


PV (Volume displaced by Piston) = Bore X Bore X Stroke X 12.87


Compression Ratio = (GV+DV+HV-VV+PV) / (GV+DV+HV-VV)

Cubic Inches = Bore x Bore X Stroke X Number of Cylinders X .7854

Convert Cubic Inches to CCs = Cubic Inches X 16.386
Convert Cubic Inches to Liters = Cubic Inches X .016386 

Engine in Liters = (Bore(mm) X Bore(mm) X Stroke(mm)
X Number of Cylinders X 12.87) / (16386 X 1000)

Engine in CCs = (Bore(mm) X Bore(mm) X Stroke(mm)
X Number of Cylinders X 12.87) / 16386

Convert CCs to Cubic Inches = CCs / 16.386
Convert Liters to Cubic Inches = Liters / .016386

  Compression ratio calculator and formulas courtesy of Ross Racing Pistons.