Engine Size Calculator
Engine
displacement table (CC's)

Bore 
77 
83 
85.5 
86 
87 
87.5 
88 
90 
90.5 
92 
93 
94 
96 
100 
Stroke 












64 

1192  1385  
69 

1285  1493  1585  1603  1641  1660  1679  1755  1775  1835  1875  1915  1998  2168 
74 

1904  1968  2054  
76  
78 

2017  2085  2176  
82 

2087  2110  2180  2276  
84 

2161  2234  2332  
86 

Formula for calculating Engine Displacement
BORE (mm) X BORE (mm) X STROKE (mm) X 0.0031416 = Engine Displacement in CC's
Example: 92 X 92 X 69 X .0031416 = 1835cc
To get the volume for one (1) cylinder in CC's, simply divide by four (4).
Example: 1835 ÷ 4 = 458.69cc
Formula for calculating Deck Volume
BORE (mm) X BORE (mm) X DECK HEIGHT (in.) X .01996 = Deck Volume
Example: 87 X 87 X .060" X .01996 = 9.06cc
Formula for calculating Compression Ratio
(Head cc + Deck cc + 1 Cylinder volume) ÷ (Head cc + Deck cc) = Compression Ratio
Example: (50cc + 9.06cc + 410.25cc) ÷ (50cc + 9.06cc) = 7.95 OR 7.95:1
Or: 469.31 ÷ 59.06 = 7.95 OR 7.95:1
Please note that this information is
provided as a GUIDE ONLY we cannot
be held responsible for any errors.