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 + b) / 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 
