Thanks Nolan - insightful as ever...
This whole trunion breaking thing - surely if the castor has been set to Triumph spec then everything will be ok... ? Or are you saying castor shouldnt be set - and it should be a by-product of the toe?
I can of course check all this by looking at the shims - and if I remember correctly there were uneven amounts - so it seems it was adjusted.
Thirdly.... as castor is a part of the toe settings - surely they cant charge me for doing both! Possibly...
James
Nolan Penney wrote:
No, caster is adjustable. It's adjustable the same way it is for any production double a-arm front suspension car. You use an unequal quantity of shims under the lower a-arm mounts to "tilt" the arm forward or back, changing the castor.
The caveat is that a Spitfire doesn't use a double ball joint
suspension, it uses a trunnion on the bottom instead. The trunnion
only has two axis of rotation, not the three a ball joint has. So it
doesn't take kindly to being shoved forward and backwards. This induces
wear on the trunnion, and can lead to breakage. This is something I've
been pointing out for years, that you've got to be careful about this
with regards to Spitfires. Glad to see one of the louder nay sayers has
finally seen the light.
And, of course, the shop that worked on your car may not have adjusted it anyhow, and simply noted it incorrectly in their repair write up.
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