Helpful Calculators

[bombedbanshee06]

Piston Speed (ft/min.)

a = RPM

b = Stroke of Engine (ft)

Formula: 2 x a x b

Example: 2 x 8000 x .333 = 5328 ft/min

 

Compression Ratio (Total Swept Volume)

a = Combustion Chamber Volume at TDC

b = Cylinder Displacement (cc)

Formula: (a + / a

Example: (100.00 + 823.70) / 100.00 = 9.237

 

Rod Ratio

a = Rod Length

b = Stroke of Engine

Formula: a / b

Example: 6.0 / 3.5 = 1.714

 

Rod Length

a = Cylinder Block Length

b = Deck Clearance

c = Target Compression Height of Piston

d = Stroke of Engine

Formula: a - b - (c + (d / 2))

Example: 9.025 - .025 - (1.0 + (3.5 / 2)) = 6.25

 

Piston Dome Volume

a = Head Chamber Volume (cc)

b = Gasket Volume (cc)

c = Deck to Piston Volume (cc)

d = Cylinder Displacement

e = Target Compression Ratio

Formula: (a + b + c - (d / (e - 1.00))) x -1

Example: (60 + 10 + 10 - (823.7 / (9.237 - 1.00))) x -1 = 20cc

 

Piston Compression Height

a = Block Length

b = Stroke of Engine

c = Rod Length

d = Deck Clearance

Formula: a - (b / 2 + c) - d

Example: 9.025 - (3.50 / 2 + 6.00) - .025 = 1.250

 

Cylinder Displacement

a = Bore (Inches)

b = Stroke of Engine (Inches)

c = Number of Cylinders

cc Formula: a x a x .7854 x b x 16.387 x c

cc Example: 4 x 4 x .7854 x 4.0 x 16.387 x 6 = 4942.2142

CI Formula: a x a x .7854 x b x c

CI Example: 4 x 4 x .7854 x 4.0 x 6 = 301.5936