Spitfire Spring Specifications

by Bob Sykes via Mike Lindsay

Here's what Thomason has to say about
the front springs.  Bear in mind that he's talking about UK
market cars.  As you may know the springs are identified by
a small dab of coloured paint on one of the end coils.

Spit-4 (Mk1)
Spring length - free (in.) = 12.59
Spring length - fitted (in.) = 7.8 in.
Spring rate (lbf/in.) = 150
Spring identification = Green

Spit-4 (Mk1) between FC 3,214 and FC 39,527
Spring length - free (in.) = 12.21
Spring length - fitted (in.) = 7.42
Spring rate (lbf/in.) = 150
Spring identification = Light Blue

Spit-4 (Mk2)
Spring length - free (in.) = 12.59
Spring length - fitted (in.) = 7.8
Spring rate (lbf/in.) = 150
Spring identification = Green

Spit (Mk3)
Spring length - free (in.) = 12.21
Spring length - fitted (in.) = 7.5
Spring rate (lbf/in.) = 150
Spring identification = Purple

Spit (Mk4)
Same as Mk3

Spit 1500
Spring length - free (in.) = ??
Spring length - fitted (in.) = 8.0
Spring rate (lbf/in.) = 180
Spring identification = Purple/White

The changes correspond to changes in vehicle weight and
different front anti-roll bar diameters.  Perhaps some
other factors too.








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