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Video Compression Ratio 1
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          A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Formulary Compression ratio (varying)


Stroke and height difference in a four-cylinderengine




The compression ratio can be increased through …
- material loss from the cylinder head (planing),
- a thinner head gasket,
- more compression of the piston,
- longer con-rods.

    s                 s
h = -
        old - 1       new - 1

          s · (old - 1)
new = - 1
        s - h · (old - 1)

Check your calculation!     You need help?
Please enter numbers only in three of the four fields!
new Compression (new)
old Compression (old)
s Stroke mm
h Height difference mm


A positive value for the difference in height means that either from the cylinder head must be removed material or a thinner head gasket must be used. A negative height difference will probably only be achieved with a thicker head gasket. 06/14