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General instructions for gearbox repairs > < Power transmission diagram

Leon Mk1

Calculation of the gear ratio “i”
Calculation of the gear ratio “i”
The gear ratio is obtained by dividing the number of teeth on the driven gear by the number of teeth on the driving gear.
Example:
   
 5th gearDifferential
Driving gear (primary)51 (Z1 Primary)16 (Z1 Gear)
Driven gear (secondary)38 (Z2 Secondary)68 (Z2 Crown)

i = Z2 : Z1
In this way we can find out:
iG = Gear ratio of a gear
iG =
Z2 Secondary
Z1 Primary
=
38
51
= 0,745
iA = Gear ratio of the differential
iA =
Z2 Crown
(Z1 Gear
=
68
16
= 4,250
itotal = Total gear ratio
Is obtained by multiplying the gear ratios of the longest gear and the differential.
itotal = iG x iA = 0.745 x 4.267 = 3.166
   

General instructions for gearbox repairs > < Power transmission diagram